CBSE Class 11 Chemistry p-Block Elements MCQs

MCQ - Choose Appropriate Alternative

Question. Which metal is used in the thermal process because of its activity.
(a) Iron 
(b) Copper 
(c) Aluminum 
(d) Zinc

Question. Aluminum oxides is
(a) Acidic oxide 
(b) Basic oxide 
(c) Amphoteric oxide 
(d) None of these

Question. Chemical composition of colemnite is.
(a) Ca₂B₆O₁₁. 5H₂O 
(b) CaB₄O₇. 4H₂O 
(c) Na₂B₄O_7. 4H₂O 
(d) CaNaB₅O₉. 8H₂O

Question. Which element forms an ion with charge 3+.
(a) Beryllium  
(b) Aluminum 
(c) Carbon 
(d) Silicon

Question. Which element among the following belongs to Group IVA of the periodic Table.
(a) Barium
(b) Iodine 
(c) Lead
(d) Oxygen

Question. Boric acid cannot be used.
(a) As antiseptic in medicine 
(b) For washing eyes 
(c) In soda bottles 
(d) For enamels and glazes

Question. Which of the following elements is not present abundantly in earth's crust.
(a) Silicon 
(b) Aluminum 
(c) Sodium 
(d) C

Question. The chief Ore of aluminum is.
(a) Na₃AIF₆ 
(b) Al₂O₃. 2H₂O 
(c) l₂O₃ 
(d) Al₂O₃. H₂O

Question. The Group IIA of the periodic table comprises the elements.
(a) Boron, aluminum, gallium, indium and thallium. 
(b) Boron gallium, thallium.
(c) Aluminum, calcium, strontium. 
(d) All of the above

Question. Boron is non-metallic because of
(a) Large size and higher nuclear change 
(b) Small size and higher nuclear charge
(c) Small size and smaller nuclear charge 
(d) None of the above

Question. The increase in the atomic size in group is
(a) Regular 
(b) Irregular
(c) Both  
(d) None of the above

Question. Orthoboric Acid is a mineral of.
(a) Aluminum 
(b) Silicon 
(c) Calicium 
(d) Boron

Question. Aluminum is the third most abundant elements in earth crust after.
(a) Oxygen 
(b) Silicon 
(c) None of the above 
(d) Both of the Both

Question. Bauxite is an ore of.
(a) Aluminum 
(b) Boron 
(c) Carbono 
(d) Gallium

Question. Which of the elements of Group IIA are rare and only obtained as by-products.
(a) Gallium thallium 
(b) Thallium indium 
(c) Gallium indium 
(d) Gallium thallium indium

Question. Borax is the sodium salt of tetraboric acid. It is most important of all among.
(a) Borates 
(b) Carbonates 
(c) Bicarbonates 
(d) None of the above

Question. Borax occurs as natural deposit called tincal in the dried up lakes of.
(a) Tibet
(b) California 
(c) Tibet & California
(d) Virginia

Question. Group IV A of the periodic table comprises elements.
(a) Carbon silicon 
(b) Tin, carbon , silicon
(c) Carbon, silicon, tin and lead 
(d) None of the above

Question. The non-metals in Group IV A are.
(a) Carbon, silicon 
(b) Tin and Lead 
(c) All of the above 
(d) None of the above

Question. The elements of Group IV A are character sized by a set of.
(a) Three valence shell electrons 
(b) Four valence shell electrons
(c) Five valence shell electrons
(d) Two valence shell electrons

Question. Group IV A elements form.
(a) Super oxide
(b) Oxides 
(c) Dioxide
(d) All of the above

Question. The property of catenation among the carbon and silicon.
(a) Increase on moving down the group form carbon to lead 
(b) Decrease on moving down the group from lead to carbon.
(c) Decreases on moving down the group from carbon to lead 
(d) Stable on moving down the group from carbon to lead.

Question. The oxides of carbon are
(a) CO and CO₂ 
(b) CO, CO₂ and C₃O₂ carbon sub oxide
(c) CO, CO₂, C₂C₃ 
(d) None of the above

Question. China wares are made form a mixture of
(a) Kaolin and bone ash
(b) Kaolin and feldspar
(c) Kaolin feldspar and bone ash
(d) None of the above

Question. Various oxides are used as pigments in the pigments of which element.
(a) Oxides of lead, basic lead carbonate etc.
(b) Various oxides of lead
(c) Various oxides of lead, basic lead carbonate, lead chromate
(d) Oxides of aluminum

Question. Boron occurs in traces and has been found to be important for the growth of.
(a) Plants of many kinds
(b) Plants and animals
(c) Animals
(d) None of the above

Question. Semiconductors conduct electricity better than.
(a) Conductors
(b) Insulators
(c) Both of the above
(d) None of the above

Question. Oxygen is the abundant element in earth crust?
(a) Most of all
(b) 2nd in number
(c) Third most abundant
(d) 4th most abundant

Question. Substance which is found in dried up lakes of Tibet and California is______
(a) Tincal 
(b) Boric Acid
(c) Calcium carbonate     
(d) All

Question. Boron is a white crystalline solid and it is________
(a) More soluble in cold water
(b) More soluble in hot water
(c) More soluble in water
(d) Soluble only in organic solvents

Question. One of the outstanding features of boron is ability to form________
(a) Molecular addition compounds
(b) Molecular crystals
(c) Semiconductors
(d) All

Question. Which of the following does not give Borax bead test?
(a) Cu
(b) Cr
(c) Ni
(d) Al

Question. The metal which is used in thermite process because of its activity is_
(a) Iron
(b) Copper
(c) Aluminium
(d) Zinc

Question. Which of the following shows inert pair effect?
(a) Boron
(b) Carbon
(c) Silicon
(d) Tin

Question. Tincal is a mineral of____________
(a) Al
(b) Si
(c) B
(d) C

Question. Because of its ability to combine with both oxygen and nitrogen, aluminium metal is used
(a) As nitrometer
(b) To remove air bubbles from molten metal
(c) To produce alloy
(d) All

Question. Silicon differ from silica by a group of _________
(a) CH₃
(b) –OH
(c) OCH₃
(d) O₂

Question. Boron in soil has been considered essential specially for________
(a) Soil porosity
(b) Proper growth of plants
(c) Alkalinity of soil
(d) All

Question. Special feature of borate glass is that it is ______
(a) Heat resistant 
(b) Low melting
(c) Used to prepare chemical garden 
(d) All

Question. Inp–block elements,thes–electronsofoutershelloftheheaviermembersarefailedtoparticipateinbonding, because they
(a) Remain paired
(b) Remain unpaired
(c) Are free
(d) None of these

Question. The tendency of the pair of S – electron to remain inert increase with the increase in
(a) Atomic number
(b) Atomic weight
(c) E.N
(d) I.P

Question. Boron does not easily form cations, because it has the tendency to form bond like non-metal
(a) Ionic bond
(b) Metallic bond
(c) Hydrogen bond
(d) Covalent bond

Question. Boron is metalloid and semiconductor like
(a) Be
(b) K
(c) Si
(d) Al

Question. Which element is unstable in air and is oxidized superficially in air
(a) Aluminum
(b) Thallium
(c) Gallium
(d) Indium

Question. Crystalline boron has structure
(a) Cubic
(b) Monoclinic
(c) Hexagonal
(d) Trigonal

Question. The hydrides B₂H₆ and Si₂H₆ are said to
(a) Ionic hydrides
(b) Complex hydrides
(c) Interstitial hydrides
(d) Covalent hydrides

Question. The compound, which is used in borax bead test for cations analysis, is
(a) NaOH
(b) H₃BO₃
(c) Na₂B₄O₇.10H₂O
(d) H₂B₄O₇

Question. Orthoboric acid is weak acid because it
(a) Accepts OH^-1 ion
(b) Donate OH^-1 ion
(c) Accept H⁺¹
(d) Donate H⁺¹

Question. The aqueous solution of which acid is used for washing eyes?
(a) H₂B₄O₇
(b) HCl
(c) H₃BO₃
(d) HBO₂

Question. The process in which Bauxite is purified by dissolving it in 45% aqueous NaOH at 150^oC to separateinsoluble iron oxide as red mud is called
(a) Hall’s process
(b) Baeyer’s process
(c) Arrhenius process
(d) Grignard process

Question. Bauxite is an oxide mineral of
(a) Cu
(b) Ag
(c) Al
(d) Zn

Question. Bauxite is an oxide mineral of
(a) Cu
(b) Ag
(c) Al
(d) Zn

Question. AlCl₃ and GaCl₃ are covalent when anhydrous because
(a) They belong to group III A
(b) Their ions have small size and high charge
(c) They have high I.P
(d) None of these

Question. In the electrolysis of alumina is mixed with Cryolite(Na₃AlF₆) and fluorspar(CaF₂) in the ratio of 20:60: 20. the function of the Cryolite and fluorspar is
(a) To decrease the fusion temperature of alumina and to make good conductor of electricity
(b) To dissolve alumina
(c) To dissolve sodium
(d) To increase the ionization of alumina

Question. Termite is a mixture of
(a) Iron oxide and aluminum
(b) Iron oxide and copper
(c) Copper oxide and aluminum
(d) None of these

Question. In aluminum termite process, aluminum acts as a
(a) Reducing agent
(b) Oxidizing agent
(c) A flux
(d) None of these

Question. Which aluminium alloy is extremely light?
(a) Duralumin
(b) Alnico
(c) Magnalium
(d) Aluminium bronze

Question. Cupric oxide on heating with B₂O₃ yields blue colored beads in the oxidizing flame because
(a) Cupric borates are white in color
(b) Cupric borates are black in color
(c) Cupric borates are green in color
(d) Cupric borates are blue in color

Question. In mordenting aluminium ions (Al⁺³) are precipitated on the cloth as
(a) Al₂O3
(b) AlN
(c) Al(OH)₃
(d) AlCl₃

Question. Platinum metal can be dissolved in
(a) Hot con HCl
(b) Hot con H₂SO₄
(c) Hot con HNO₃
(d) A mixture of Con. HCl and con HNO₃

Question. Which of the following can form nitride, which react with water to give ammonia?
(a) Boron
(b) Gallium
(c) Indium
(d) Thallium

Question. The weak acid, which cannot be titrated with standard alkies, is
(a) HCl
(b) H₂SO₄
(c) H₃BO₃
(d) All of these

Question. Carbon differs from other members of its group due to smaller atomic size,higher electro negativity and the absence of
(a) s – electrons
(b) p – electrons
(c) d – electrons
(d) All of these

Question. Aqua regia is a mixture of concentrated HNO₃ and concentrated HCl in the ratio of
(a) 3 : 1
(b) 1 : 3
(c) 2 : 3
(d) 3 : 2

Question. In land storage batteries, the acid used is
(a) Con HCl
(b) Dil.HCl
(c) Con H₂SO₄
(d) Dil H₂SO₄

Question. The dry ice is a compound of
(a) Solid ice with any water
(b) Solid SO₂
(c) Solid CO₂
(d) Solid C₆H₆

Question. In the contact process for the manufacturing of H₂SO₄, the catalyst used is
(a) Cu
(b) Ni
(c) Pt
(d) N₂O₅

Question. The depositing layer in tin plating is
(a) Cu
(b) Sn 
(c) Al
(d) Ni

Question. Ortho boric acid on heating at 100^oC yields
(a) Meta boric acid
(b) Pyroboric acid
(c) Tetra boric acid
(d) Boric anhydride acid (B₂O₃)

Question. Which of the following is used in photographic film?
(a) MgBr₂
(b) NaCl
(c) AgBr
(d) Na₂S₂O₃

Question. Aluminum does not react with HNO₃ at any concentration and therefore HNO₃ is transported in aluminum containers, this is due to formation of protective layer of
(a) Cupric oxide
(b) Ferric oxide
(c) Aluminum oxide
(d) Aluminum nitride

Question. Action of aqua regia on noble metals is due to
(a) HNO₃
(b) HCl
(c) H₂SO₄
(d) Chlorine

Question. Phosgene is a poisonous gas, its chemical name is
(a) Carbon dioxide
(b) Phosphonyl chloride
(c) Carbon monoxide
(d) Carbonyl chloride

Question. The maximum inert pair effect is shown by
(a) B
(b) Al
(c) Ga
(d) Tl

Question. Quartz is the polymeric form of
(a) (SiO₂)n
(b) (CO₂)n
(c) (CH₂ – CH₂)n
(d) None of these

Question. If a metal is protected by an oxide layer from further attack, the metal is said to be
(a) Reactive
(b) Active
(c) Passive
(d) Attractive

Question. Carbon reacts with metals to form
(a) Hydrides
(b) Oxides
(c) Hydroxides
(d) Carbide

Question. The control addition of III A and IV A members in Silicon and Germanium is known as
(a) Inert pair effect
(b) Doping
(c) Litharge
(d) Red lead

Question. P – type of semi conductor are formed by mixing Silicon or Germanium with members of
(a) III A
(b) IV A
(c) V A
(d) VI A

Question. Litharge is chemically
(a) PbO
(b) PbO₂
(c) Pb₃O₄
(d) Pb(CH₃COO)

Question. The Octet rule is not followed by
(a) Boron on BCl₃
(b) Oxygen in H₂O
(c) Nitrogen in NH₃
(d) Phosphorus in PH₃

Question. Which of the following elements show oxidation state of + 3 only?
(a) B
(b) Ga
(c) In
(d) Ti

Question. ______ of the following is not metallic in nature.
(a) Boron
(b) Aluminum
(c) Indium
(d) Thallium

Question. The oxides of Boron are ______ in nature.
(a) Acidic
(b) Basic
(c) Neutral
(d) None of these

Question. Orthoboric acid on heating to about 100^oC looses a water molecule to form ______
(a) Metaboric acid
(b) Pyroboric acid
(c) Metaboric and pyroboric acid
(d) None of these

Question. The function of Fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite (NA₃ AlF₆) is
(a) As a catalyst
(b) To lower the temperature of the melt and to make the fused mixture conducting.
(c) To decrease the rate of oxidation of carbon at the anode.
(d) None of the above

Question. Which of the following statements is correct?
(a) H₃PO₃ is dibasic and reducing
(b) H₃PO₃ is tribasic and reducing
(c) H₃PO₃ is tribasic and non – reducing
(d) H₃PO₃ is dibasic and non – reducing

Question. Boric acid is
(a) Weak monobasic Lewis acid
(b) Only weak monobasic Arhenius acid
(c) Only weak monobasic Bronsted acid
(d) Only weak tribasic Arrhenius acid

Question. The reduction of metal oxides is sometimes accomplished by using aluminum in the
(a) Goldschmidt’s reaction
(b) Silberchemdit’s reaction
(c) Baeyer’s reaction
(d) Zilch’s reaction

Question. Hall’s process is based on electrolysis of
(a) Alumina
(b) Gypsum
(c) Borax
(d) None of these

Question. _______ is a better conductor of heat.
(a) Fe
(b) Sn
(c) Al
(d) None of these