JEE Chemistry The P Block Elements MCQs Set B

Question: Which of the following is not correct?

• a) GeCl₂ is more stable than GeCl₄
• b) GeO₂ is weakly acidic
• c) GeCl₄ in HCl forms [ GeCl₂]^2– ion
• d) None of these

Answer: GeCl₂ is more stable than GeCl₄

Question:  The main reason that SiCl₄ is easily hydrolysed as compared to CCl₄ is that

• a) Si can extend its coordination number beyond four
• b) SiCl₄ is covalent
• c) SiCl₄ can form hydrogen bonds
• d) Si-Si bond is weaker

Answer: Si can extend its coordination number beyond four

Question: Which halide is least stable and has doubtful existence

• a) PbI₄
• b) GeI₄
• c) CI₄
• d) SnI₄

Answer: PbI₄

Question: PbF₄, PbCl₄ exist but PbBr₄ and PbI₄ do not exist because of

• a) strong oxidising character of Pb⁴⁺
• b) strong reducing character of Pb⁴⁺
• c) low electronegativity of Br^– and I^–.
• d) None of these

Answer: strong oxidising character of Pb⁴⁺

Question: Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order

• a) 

  

• b) Ge > Sn > Si > C
• c) C > Si > Ge > Sn
• d) Si > C > Sn > Ge

Answer: 

Question:

• a) 348, 180, 167
• b) 180, 167, 348
• c) 167, 180, 348
• d) 348, 167, 180

Answer: 348, 180, 167

Question: Lead pipes are readily corroded by

• a) CH₃COOH
• b) H₂SO₄
• c) HCl
• d) pure water

Answer: CH₃COOH

Question:  Lead pipes are not suitable for drinking water because

• a) lead reacts with water containing air to form Pb(OH)₂
• b) a layer of lead dioxide is deposited over pipes
• c) lead reacts with air to form litharge
• d) lead forms basic lead carbonate

Answer: lead reacts with water containing air to form Pb(OH)₂

Question: The reducing power of divalent species decreases in the order

• a) Ge > Sn > Pb
• b) Pb > Sn > Ge
• c) Sn > Ge > Pb
• d) None of these

Answer: Ge > Sn > Pb

Question: The element that does not show catenation among the following p-block elements is

• a) lead
• b) silicon
• c) carbon
• d) germanium

Answer: lead

Question: How many six membered and five membered rings are present in fullerene?

• a) Six membered = 20, five membered = 12
• b) Six membered = 20, five membered = 10
• c) Six membered = 25, five membered = 10
• d) Six membered = 12, five membered = 25

Answer: Six membered = 20, five membered = 12

Question: Which of the following is the pure form of carbon ?

• a) Fullerene
• b) Diamond
• c) Graphite
• d) All three forms are equally pure

Answer: Fullerene

Question: Which one of the following is not an allotrope of carbon ?

• a) Carborundum
• b) Soot
• c) Diamond
• d) Graphite

Answer: Carborundum

Question: Which of the following types of forces bind together the carbon atoms in diamond ?

• a) Covalent
• b) van der Waal’s
• c) Dipolar
• d) Ionic

Answer: Covalent

Question: Carborundum is

• a) SiC
• b) Mg₂C₃
• c) None of these
• d) CaC₂

Answer: SiC

Question: Buckminster fullerene is

• a) C-60
• b) C-90
• c) pure graphite
• d) diamond

Answer: C-60

Question: The hybridisation state of carbon in fullerene is

• a) sp²
• b) sp³d
• c) sp
• d) sp³

Answer: sp²

Question: The number of carbon atoms in Buckminsterfullerene is

• a) 60
• b) 50
• c) 350
• d) 70

Answer: 60

Question: Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite

• a) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak inter plate bonds
• b) is a non-crystalline substance
• c) has molecules of variable molecular masses like polymers
• d) is an allotropic form of diamond

Answer: has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak inter plate bonds

Question: In graphite, electrons are

• a) spread out between the structure
• b) localised on each C-atom
• c) present in anti-bonding orbital
• d) localised on every third C-atom

Answer: spread out between the structure

Question: The elements commonly used for making transistors are

• a) Si and Ge
• b) Ga and In
• c) C and Si
• d) P and As

Answer: Si and Ge

Question: The element which is exclusively applied as semi-conductor

• a) Ge
• b) Si
• c) Au
• d) Pt

Answer: Ge

Question: Glass is a

• a) supercooled liquid
• b) transparent organic polymer
• c) solid
• d) liquid

Answer: supercooled liquid

Question: Producer gas is the mixture of

• a) CO + N₂
• b) CO + water vapours
• c) CO + H₂
• d) N₂ + CH₄

Answer: CO + N₂

Question: Glass reacts with HF to produce

• a) H₂SiF₆
• b) Na₃AlF₆
• c) SiF₄
• d) None of these

Answer: H₂SiF₆

Question: Coal gas is a mixture of

• a) H₂,CO,N₂ and CH₄
• b) CH₄ and CO
• c) H₂O and CO
• d) H₂ and CO

Answer: H₂,CO,N₂ and CH₄

Question: Crystalline form of silica is called

• a) quartz
• b) talc
• c) crystalline silicon
• d) rock

Answer: quartz

Question: Dry ice is

• a) solid CO₂
• b) solid NH₃
• c) solid SO₂
• d) solid O₂

Answer: solid CO₂

Question: In silica (SiO₂), each silicon atom is bonded to

• a) four oxygen atoms
• b) two oxygen atoms
• c) one silicon and two oxygen atoms
• d) one silicon and three oxygen atoms

Answer: four oxygen atoms

Question: R₃SiCl on hydrolysis forms

• a)

  

• b) None of these
• c) R₃SiOH
• d) None of these

Answer: 

Question: Which of the following statements is false?

• a) Water gas is a mixture of hydrogen and carbon monoxide
• b) Producer gas is a mixture of CO and nitrogen
• c) Water gas is a mixture of water vapour and hydrogen
• d) Natural gas consists of methane, ethane and gaseous hydrocarbons

Answer: Water gas is a mixture of hydrogen and carbon monoxide

Question: Which gas is essential constituent of almost all fuel gases ?

• a) CO
• b) CO₂
• c) N₂
• d) H₂O

Answer: CO

Question: CO₂ is used for extinguishing fire because

• a) it is neither combustible nor a supporter of combustion
• b) it is a colourless gas
• c) in solid state, it is called dry ice
• d) it has a relatively high critical temperature

Answer: it is neither combustible nor a supporter of combustion

Question: The correct statement with respect to CO is

• a) it reacts with haemoglobin in RBC
• b) it is powerful oxidising agent
• c) it is used to prepare aerated drinks
• d) it combines with H₂O to give carbonic acid

Answer: it reacts with haemoglobin in RBC

Question: Producer gas, a fuel and also a source of nitrogen is obtained by

• a) restricted supply of air through a bed of incandescent coke
• b) passing steam over incandescent coke
• c) spraying oil into hot retorts
• d) passing a mixture of steam and air over incandescent coke

Answer: restricted supply of air through a bed of incandescent coke

Question: Which of the following shows bond in silicone

• a) – Si – O – Si – O – Si
• b) Si – C – Si – O – Si
• c) Si – Si – Si – Si
• d) Si – C – Si – C – Si

Answer: – Si – O – Si – O – Si

Question: Which of the following is formed on dehydration of formic acid with concentrated H₂SO₄ ?

• a) CO
• b) CO₂
• c) H₂
• d) CH₄

Answer: CO

Question: _____ helps to maintain pH of blood between 7.26 to 7.42

• a)

  

• b) H₂CO₃
• c) CO₂
• d) None of these

Answer: 

Question: Which of the following is not the crystalline form of silica?

• a) All are crystalline form of silica
• b) Tridymite
• c) Cristobalite
• d) Quartz

Answer: All are crystalline form of silica

Question: Which of the following is used in surgical and cosmetic plants?

• a) Silicones
• b) Silica
• c) Silicates
• d) None of these

Answer: Silicones

Question: Which of the following is not a man-made silicate ?

• a) Zeolites
• b) Glass
• c) Cement
• d) All are man-made silicates

Answer: Zeolites

Question: Which type of zeolite is used to convert alcohols directly into gasoline ?

• a) ZSM – 5
• b) All of these
• c) ZSM – 3
• d) ZSM – 2

Answer: ZSM – 5

Question: Which of the following statement(s) is/are not correct ?

(i) Valence shell electronic configuration of p-block elements is ns² np^1-6
(ii) Non metals and metalloids exist only in the p-block of the periodic table.
(iii) In boron, carbon and nitrogen families the group oxidation state is the most stable state for the lighter elements in the group.
(iv) For heavier elements in each group oxidation state two unit less than the group oxidation state becomes more stable due to inert pair effect

• a) All given statements are correct
• b) (iii) and (iv)
• c) (ii), (iii) and (iv)
• d) (ii) only

Answer: All given statements are correct

Question:

• a) TTF
• b) TTT
• c) FTF
• d) FTT

Answer: TTF

Question: Which of the following statement(s) is/are incorrect ?

(i) Trichlorides on hydrolysis in water form tetrahedral [M(OH)₄]^– species.
(ii) Hybridisation state of metal in tetrahedral species is sp3.
(iii) Aluminium chloride in acidified aqueous solution forms [Al(OH)₄]^– ion.

• a) (iii) only
• b) (i) and (ii)
• c) (ii) only
• d) (i) and (iii)

Answer: (iii) only

Question: Which of the following statement(s) regarding BCl₃ and AlCl₃ is/are correct ?

(i) BCl₃ possess lower melting point than AlCl₃.
(ii) BCl₃ is more covalent in character than AlCl₃.

• a) Statement (ii) is correct explanation for statement (i)
• b) Statement (i) and (ii) both are correct
• c) Statement (i) and (ii) both are incorrect
• d) Statement (i) is correct explanation for statement (ii).

Answer: Statement (ii) is correct explanation for statement (i)

Question: Which of the following statement(s) is/are incorrect ?

(i) Higher boranes are not flammable.
(ii) Boranes are hydrolysed by water to give orthoboric acid.
(iii) Boranes undergoes cleavage reactions with Lewis bases to give borane adducts.

• a) (i) only
• b) (iii) only
• c) (ii) and (iii)
• d) (i) and (ii)

Answer: (i) only

Question: Select the correct statements for diborane :

(i) Boron is approximately sp³ hybridized
(ii) B – H – B angle is 180°
(iii) There are two terminal B – H bonds for each boron atom
(iv) There are only 12 bonding electrons

• a) (i), (iii) and (iv)
• b) (i), (ii) and (iii)
• c) (i), (ii) and (iv)
• d) (ii), (iii) and (iv)

Answer: (i), (iii) and (iv)

Question: Which of the following sequence of T and F is correct for given statements. Here T stands for the true and F stands for false statement.

(i) The tendency to show +2 oxidation state increase in the sequence Ge < Sn < Pb.
(ii) Tin in +2 state is a reducing agent.
(iii) Lead compounds in +2 state are strong oxidising agents.
(iv) In tetravalent state molecules of group 13 elements act as electrons donor species.

• a) TTFF
• b) TFFT
• c) TTTT
• d) TTFT

Answer: TTFF

Question: Which of the following statement(s) is / are incorrect for CO₂?

(i) In laboratory CO₂ is prepared by the action of dilute HCl on calcium carbonate
(ii) Carbon dioxide is a poisonous gas
(iii) Increase in carbon dioxide content in atmosphere lead to increase in green house effect.
(iv) CO₂ as dry ice is used as a refrigerant for ice cream and frozen food.

• a) Only (ii)
• b) (ii) and (iii)
• c) (i) and (ii)
• d) (i), (ii) and (iii)

Answer: Only (ii)

Question: Which of the following sequence of T and F is correct for given statements. Here T stands for true and F stands for false statement.

(i) Quartz is extensively used as a piezoelectric material.
(ii) Kieselghur is an amorphous form of silica which is used in filteration plants.
(iii) Silica does not react with halogens, dihydrogen and most of the acids and metals even at elevated temperature.

• a) TTT
• b) TFT
• c) TFF
• d) FFT

Answer: TTT

Question:

• a) A – (r), B – (s), C – (p), D – (q)
• b) A – (s), B – (r), C – (p), D – (q)
• c) A – (q), B – (r), C – (s), D – (p)
• d) A – (p), B – (r), C – (q), D – (s)

Answer: A – (r), B – (s), C – (p), D – (q)

Question:

• a) A – (t), B – (r), C – (q), D – (p), E – (s)A – (t), B – (r), C – (s), D – (q), E – (p)
• b) A – (t), B – (r), C – (s), D – (q), E – (p)
• c) A – (r), B – (q), C – (s), D – (p), E – (t)
• d) A – (t), B – (s), C – (p), D – (q), E – (r)

Answer: A – (t), B – (r), C – (q), D – (p), E – (s)A – (t), B – (r), C – (s), D – (q), E – (p)

Question:

• a) A – (s), B – (q), C – (p), D – (r)
• b) A – (s), B – (q), C – (r), D – (p)
• c) A – (q), B – (s), C – (p), D – (r)
• d) A – (q), B – (s), C – (r), D – (p)

Answer:  A – (s), B – (q), C – (p), D – (r)

Question:

• a) A – (q), B – (q), C – (r), D – (p), E – (p)
• b) A – (q), B – (r), C – (r), D – (p), E – (p)
• c) A – (q), B – (r), C – (r), D – (p), E – (q)
• d) A – (q), B – (q), C – (q), D – (r), E – (p)

Answer:  A – (q), B – (q), C – (r), D – (p), E – (p)

Question:

• a) A – (q), B – (s), C – (r), D – (p)
• b) A – (q), B – (r), C – (s), D – (p)
• c) A – (p), B – (r), C – (s), D – (q)
• d) A – (s), B – (q), C – (r), D – (p)

Answer: A – (q), B – (s), C – (r), D – (p)

Question:

• a) A – (s); B – (p); C – (t); D – (r); E – (q)
• b) A – (t); B – (q); C – (p); D – (r); E – (s)
• c) A – (p); B – (t); C – (r); D – (s); E – (q)
• d) A – (r); B – (p); C – (q); D – (t); E – (s)

Answer:  A – (s); B – (p); C – (t); D – (r); E – (q)

Question:

Assertion : The use of aluminium and its compounds for domestic purposes is now reduced considerably.
Reason : The highly toxic nature of aluminium is the responsible factor

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : Boron is metalloid.
Reason : Boron shows metallic nature.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : Atomic radius of gallium is higher than that of aluminium
Reason : The presence of additional d-electron offer poor screening effect for the outer electrons from increased nuclear charge.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : Pb⁴⁺ compounds are stronger oxidizing agents than Sn⁴⁺ compounds.
Reason : The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to ‘inert pair effect’.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct
• c) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : PbI₄ of lead does not exist.
Reason : Pb–I bond initially formed during the reaction does not release enough energy to unpair 6s2 electrons.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) None of these

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question: The liquefied metal which expands on solidification is

• a) Ga
• b) Zn
• c) Al
• d) In

Answer: Ga

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which among the following oxides react with alkali?

B₂O₃, Al₂O₃ and Tl₂O

• a) B₂O₃ and Al₂O₃
• b) Only B₂O₃
• c) Al₂O₃ and Tl₂O
• d) None of these

Answer: B₂O₃ and Al₂O₃

Question: White fumes appeared around the bottle of anhydrous aluminium chloride is due to _____

• a) moist HCl
• b) condensation of aluminium chloride vapours
• c) None of these
• d) Both

Answer: moist HCl

Question: What is the oxidation state and hybridisation of boron in compound formed when BCl₃ undergoes reaction with the water?

• a) 3, sp³
• b) 3, sp²d
• c) 3, sp²d
• d) 4, sp³

Answer: 3, sp³

Question: Which is not correct?

• a) Al is ionic in all its compounds
• b) Al forms a number of alloys with other metals
• c) Al does not react with steam even at higher temperature
• d) Al acts as a reducing agent

Answer: Al is ionic in all its compounds

Question: Which one of the following is the correct statement?

• a) Chlorides of both beryllium and aluminium have bridged structures in solid phase
• b) B₂H₆.2NH₃ is known as ‘inorganic benzene
• c) Beryllium exhibits coordination number of six
• d) Boric acid is a protonic acid

Answer: Chlorides of both beryllium and aluminium have bridged structures in solid phase

Question: BF³ is used as a catalyst in several industrial processes due to its

• a) weak Lewis acid character
• b) strong Lewis acid nature
• c) weak reducing action
• d) strong reducing nature

Answer: weak Lewis acid character

Question: Which of the following statements about H₃BO₃ is not correct?

• a) It is a strong tribasic acid
• b) It is prepared by acidifying an aqueous solution of borax
• c) It has a layer structure in which planar BO3 units are joined by hydrogen bonds
• d) It does not act as proton donor but acts as a Lewis acid by accepting a lone pair of electrons

Answer: It is a strong tribasic acid

Question: The hybridisation of boron atom in orthoboric acid is

• a) sp²
• b) sp³d
• c) sp³
• d) sp

Answer: sp²

Question: Which is not the use of orthoboric acid?

• a) In borax - bead test
• b) In glazes for pottery
• c) In glass industry
• d) As an antiseptic and eye wash

Answer: In borax - bead test

Question: Which of the following reaction shows production of diborane on industrial scale ?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question: Identify the statement that is not correct as far as structure of diborane is concerned

• a) All, B – H bonds in diborane are similar
• b) The hydrogen atoms are not in the same plane in diborane
• c) Each boron atom forms four bonds in diborane
• d) There are two bridging hydrogen atoms and four terminal hydrogen atoms in diborane

Answer: All, B – H bonds in diborane are similar

Question: Which of the following structure is similar to graphite?

• a) BN
• b) B₄C
• c) B
• d) B₂H₆

Answer: BN

Question: A compound X, of boron reacts with NH₃ on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating BF₃ with lithium aluminium hydride. The compounds X and Y are represented by the formulas. 

• a) B₂H₆, B₃N₃H₆
• b) B₂O₃, B₃N₃H₆
• c) B₃N₃H₆, B₂H₆
• d) None of these

Answer: B₂H₆, B₃N₃H₆

Question: The product/s formed when diborane is hydrolysed is/are

• a) H₃BO₃ and H₂
• b) B₂O₃ and H₃BO₃
• c) B₂O₃ only
• d) None of these

Answer: H₃BO₃ and H₂

Question:

• a) (A) and (B)
• b) Only (C)
• c) (B) and (C)
• d) (A) and (C)

Answer: (A) and (B)

Question: Ge(II)compounds are powerful reducing agents whereas Pb(IV)compounds are strong oxidants .It is because

• a) of more pronounced inert pair effect in lead than in Ge
• b) Pb is more electropositive than Ge
• c) ionization potential of lead is less than that of Ge
• d) None of these

Answer: of more pronounced inert pair effect in lead than in Ge

Question: Which of the following statements is not correct ?

• a) In fullerene a six membered ring can only fuse with five membered ring and a five membered ring can only fuse with six membered rings
• b) All carbon atoms are sp² hybridised in fullerene
• c) All the above are correct
• d) None of these

Answer: In fullerene a six membered ring can only fuse with five membered ring and a five membered ring can only fuse with six membered rings

Question: The element that does not form a monoxide is

• a) silicon
• b) tin
• c) lead
• d) germanium

Answer: silicon

Question: A group 14 element is oxidised to form corresponding oxide which is gaseous in nature, when dissolved in water pH of the water decreases further addition of group 2 hydroxides leads to precipitation. This oxide can be

• a) CO₂
• b) CO₂
• c) CO
• d) SnO₂

Answer: CO₂

Question:

• a) (A) and (B)
• b) (C) and (A)
• c) (B) and (C)
• d) Only (B)

Answer: (A) and (B)

Question: Lead is not affected by dil. HCl in cold because

• a) PbCl₂ protective coating gets formed on Pb surface
• b) PbO₂ film is always present on Pb surface, which resist
• c) PbO film is formed which resists chemical attack by acid
• d) Pb is less electronegative than H

Answer: PbCl₂ protective coating gets formed on Pb surface

Question: The percentage of s-character of the hybrid orbitals of carbon in graphite and diamond are respectively

• a) 33, 25
• b) 67, 25
• c) 50, 50
• d) 33, 67

Answer: 33, 25

Question: What is the hybridisations of carbon atoms present in diamond, graphite and fullerene respectively ?

• a) sp³,sp² and sp²
• b) sp²,sp² and sp³
• c) sp²,sp³ and sp²
• d) None of these

Answer: sp³,sp² and sp²

Question: Which one of the following allotropic forms of carbon is isomorphous with crystalline silicon?

• a) Diamond
• b) Coal
• c) Graphite
• d) Coke

Answer: Diamond