BITSAT Chemistry Classification Of Elements and Periodic Properties MCQs

a) NH₃ < PH₃ < AsH₃ —Acidic

b) Li < Be < B < C—IE₁

c) Al₂O₃ < MgO < Na₂O < K₂O—Basic

d) Li+ < Na+ < K+ < Cs+ —Ionic radius

Answer: Li < Be < B < C—IE₁

Question: The decreasing order of the ionization potential of the following elements is

a) Ne > Cl > P > S > Al > Mg

b) Ne > Cl > P > S > Mg > Al

c) Ne > Cl > S > P > Mg > Al

d) Ne > Cl > S > P > Al > Mg

Answer: Ne > Cl > P > S > Mg > Al

Question: The element, with atomic number 118, will be

a) Alkali

b) Noble gas

c) Lanthanide

d) Transition element

Answer: Noble gas

Question: The valency shell of element A contains 3 electrons while the valency shell of element B contains 6 electrons. If A combines with B, the probable formula of the compound formed will be

a) AB₂ 

b) A₂B

c) A₂B₃

d) A₃B₂

Answer: A₂B₃

Question: Which has smallest size ?

a) Na⁺ 

b) Mg²⁺

c) Ne

d) O^2–

Answer: Mg²⁺

Question: The screening effect of d-electrons is

a) Equal to p-electrons

b) Much more than p-electrons

c) Same as f-electrons

d) Less than p-electrons.

Answer: Less than p-electrons.

Question: The long form of the periodic table consists of

a) 8 Horizontal and 7 vertical series

b) 7 Horizontal and 18 vertical series

c) 7 Horizontal and 7 vertical series

d) 8 Horizontal and 8 vertical series

Answer: 7 Horizontal and 18 vertical series

Question: The ions O^2–, F^–, Na^+, Mg²⁺ and Al³⁺ are isoelectronic. Their ionic radii show

a) A decrease from O^2– to F^– and then increase from Na⁺ to Al³⁺

b) A significant increase from O^2– to Al³⁺

c) A significant decrease from O^2– to Al³⁺

d) An increase from O^2– to F^– and then decrease from Na⁺ to Al³⁺

Answer: A significant decrease from O^2– to Al³⁺

Question: Which of the following does not have valence electron in 3d-subshell?

a) Fe (III)

b) Mn (II)

c) Cr (I)

d) P (0)

Answer: Fe (III)

Question: Which property is same in elements of same group of periodic table :

a) Ionisation potential

b) Electronegativity

c) Electron affinity

d) Number of valency electrons

Answer: Number of valency electrons

Question: The correct order of radii is

a) N < Be < B

b) F^- < O^2- < N^3-

c) Na < Li < K

d) Fe³⁺ < Fe²⁺ < Fe⁴⁺

Answer: F^- < O^2- < N^3-

Question: Beyllium and aluminium exhibit many properties which are similar. But, the two elements differ in

a) Forming covalent halides

b) Forming polymeric hydrides

c) Exhibiting maximum covalency in compounds

d) Exhibiting amphoteric nature in their oxides

Answer: Exhibiting maximum covalency in compounds

Question: Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acid strength is

a) Al₂O₃ < SiO₂< SO₂ < P₂O₃

b) SiO₂< SO₂ < Al₂O₃ < P₂O₃

c) SO₂< P₂O₃ < SiO₂ < Al₂O₃

d) Al₂O₃ < SiO₂< P₂O₃ < SO₂

Answer: Al₂O₃ < SiO₂< P₂O₃ < SO₂

Question: Chloride ion and potassium ion are isoelectronic. Then

a) Their sizes are same

b) Cl^– ion is bigger than K⁺ ion

c) K⁺ ion is relatively bigger

d) Their sizes depend on other cation and anion

Answer: Cl^– ion is bigger than K⁺ ion

Question: Which of the following pairs has both members from the same period of periodic table :

a) Na, Ca

b) Na, Cl

c) Ca, Cl

d) Cl, Br

Answer: Na, Cl

Question: Which of the following have same number of electrons in the outermost orbit?

a) Pb, Sb

b) N, O

c) As, Bi

d) P, Ca

Answer: As, Bi

Question: In the periodic table, with the increase in atomic number, the metallic character of an element

a) Decreases in a period and increases in a group

b) Increases in a period and decreases in a group

c) Increases both in a period and the group

d) Decreases in a period and the group

Answer: Decreases in a period and increases in a group

Question: Beryllium resembles much with :

a) Zn

b) Al

c) Li

d) Ra

Answer: Al

Question: Which one of the following ions has the highest value of ionic radius ?

a) O^2–

b) B³⁺

c) Li⁺

d) F^–

Answer: O^2–

Question: The first ionization potential of Al, as compared to that of Mg is :

a) Greater

b) Lower

c) The same

d) Twice as much

Answer: Lower

Question: The order in which the following oxides are arranged according to decreasing basic nature :

a) Na₂O,MgO,Al₂O₃,CuO

b) CuO, Al₂O₃, MgO, Na₂O

c) Al₂O₃, CuO, MgO, Na₂O

d) CuO, MgO, Na₂O, Al₂O₃

Answer: Na₂O,MgO,Al₂O₃,CuO

Question: The element with the outer electronic configuration 3d⁶4s² is a :

a) Metalloid

b) Non-metal

c) Transition metal

d) Noble gas

Answer: Transition metal

Question: Which of the following elements represents highly electropositive as well as highly electronegative character in its period?

a) Hydrogen

b) Nitrogen

c) Fluorine

d) None

Answer: Hydrogen

Question: The cause of diagonal relationship is

a) Similar electronegativities

b) Similar ionic or atomic radii

c) Similar polarizing power of ions

d) All the three

Answer: All the three

Question: The radii of F, F^–, O, O^2– are in the order of :

a) O²– > F– > O > F

b) O²– > F– > F > O

c) F^– > O²– > F > O

d) O²– > O > F– > F

Answer: O²– > F– > O > F

Question: The electro negativity of the following elements increases in the order

a) C, N, Si, P

b) N, Si, C, P

c) Si, P, C, N

d) P, Si, N, C

Answer: Si, P, C, N

Question: Which property is same in elements of same group of periodic table :

a) Lonisation potential

b) Electro negativity

c) Electron affinity

d) Number of valency electrons

Answer: Number of valency electrons

Question: The long form of the periodic table consists of

a) 8 Horizontal and 7 vertical series

b) 7 Horizontal and 18 vertical series

c) 7 Horizontal and 7 vertical series

d) 8 Horizontal and 8 vertical series

Answer: 7 Horizontal and 18 vertical series

Question: The screening effect of d-electrons is

a) Equal to p-electron

b) Much more than p-electrons

c) Same as f-electrons

d) Less than p-electrons

Answer: Less than p-electrons

Question: Beyllium and aluminium exhibit many properties which are similar. But, the two elements differ in

a) Forming covalent halides

b) Forming polymeric hydrides

c) Exhibiting maximum covalency in compounds

d) Exhibiting amphoteric nature in their oxides

Answer: Exhibiting maximum covalency in compounds