Q.82. Which has the smallest size?
(a) Mg2+ (b) Mg (c) Al (d) A13+
Ans. (d) A13+
Q.83. Which statement is wrong?
(a) Cations with greater positive charge will have smaller radius.
(b) O2- and Mg2+ are isoelectronic.
(c) Anions with greater negative charge will have smaller radius.
(d) F- and Na+ are isoelectronic.
Ans. (c) Anions with greater negative charge will have smaller radius.
Q.84. Borax is:
(a) H3BO3 (b) Na2[B4O5(OH)4].8H2O
(c) B2O3 (d) Na2 [B2 (O2)2(OH)4].6 H2O
Ans. (b) Na2[B4O5(OH)4].8H2O
Q.85. Boron does not show the following property:
(a) Boron has high melting point
(b) Does not exist free in nature
(c) Most of the compounds are ionic in nature
(d) Bad conductor of electricity
Ans. (c) Most of the compounds are ionic in nature
Q.86. Which has zero dipole moment?
(a) H2O (b) BeF2 (c) NH3 (d) NF3
Ans. (b) BeF2
Q.87. Which is V-shaped?
(a) NO3- (b) O3 (c) CO32- (d) CO2
Ans. (b) O3
Q.88. Which has three lone pairs of eleetrons?
(a) ICl2- (b) SeF3+ (c) SF5- (d) SbF4-
Ans. (a) ICl2-
Q.89. Which is acidic oxide?
(a) GeO2 (b) SiO2 (c) SnO2 (d) PbO2
Ans. (b) SiO2
Q.90. Calcium ions are not required for the following:
(a) In blood clotting (b) To maintain regular beating of the heart.
(c) Important in bones (d) Photosynthesis.
Ans. (d) Photosynthesis.
Q.91. Alkali metals are kept in the block of periodic table:
(a) f-Block (b) s-Block (c) d-Block (d) p-Block
Ans. (b) s-Block
Q.92. Higher boranes do not show the following property:
(a) Most of the higher boranes are liquids.
(b) B10H14 cannot be recovered from aqueous solutions.
(c) B6H10 is solid.
(d) As molecular weight increases, gradually become more stable in air.
Ans. (c) B6H10 is solid.
Q.93. For alkali metals, the sequence of increasing covalent character is:
(a) MCl < MBr < MF < MI (b) MI < MCl < MF < MBr
(c) MBr < MI < MCl < MF (d) MF < MC1 <MBr < MI
Ans. (d) MF < MC1 <MBr < MI
Q.94. Sodim imparts the following colour to an oxidizing flame:
(a) Blue (b) Yellow (c) Violet (d) Red-violet
Ans. (b) Yellow
Q.95. Halogens do not show the following property:
(a) All are diatomic
(b) F2 is the strongest oxidizing halogen.
(c) Occur in the free elemental state in nature.
(d) They are most reactive non-metals.
Ans. (c) Occur in the free elemental state in nature.
Q.96. CO does not show the following property:
(a) It is colourless. (b) It is a non-poisonous gas.
(c) It is a reducing agent. (d) It combines with chlorine.
Ans. (b) It is a non-poisonous gas.
Q.97. What is wrong?
(a) Pentabromide is known only for P. (b) BiCl5 is known.
(c) Trihalides are known for all the group 15 elements.
(d) BiF5 exists.
Ans. (b) BiCl5 is known.
Q.98. Polyhalides do not show the following property:
(a) They are soluble in water. (b) They are covalent compounds.
(c) Conducts electricity when in solution
(d) No F3- compounds are known.
Ans. (b) They are covalent compounds.
Q.99. Lithium shows similarities to:
(a) Chlorine (b) Gold (c) Aluminium (d) Magnesium
Ans. (d) Magnesium
Q.100. Which is liquid?
(a) Bromine (b) Chlorine (c) Iodine (d) Fluorine
Ans. (a) Bromine
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(a) Mg2+ (b) Mg (c) Al (d) A13+
Ans. (d) A13+
Q.83. Which statement is wrong?
(a) Cations with greater positive charge will have smaller radius.
(b) O2- and Mg2+ are isoelectronic.
(c) Anions with greater negative charge will have smaller radius.
(d) F- and Na+ are isoelectronic.
Ans. (c) Anions with greater negative charge will have smaller radius.
Q.84. Borax is:
(a) H3BO3 (b) Na2[B4O5(OH)4].8H2O
(c) B2O3 (d) Na2 [B2 (O2)2(OH)4].6 H2O
Ans. (b) Na2[B4O5(OH)4].8H2O
Q.85. Boron does not show the following property:
(a) Boron has high melting point
(b) Does not exist free in nature
(c) Most of the compounds are ionic in nature
(d) Bad conductor of electricity
Ans. (c) Most of the compounds are ionic in nature
Q.86. Which has zero dipole moment?
(a) H2O (b) BeF2 (c) NH3 (d) NF3
Ans. (b) BeF2
Q.87. Which is V-shaped?
(a) NO3- (b) O3 (c) CO32- (d) CO2
Ans. (b) O3
Q.88. Which has three lone pairs of eleetrons?
(a) ICl2- (b) SeF3+ (c) SF5- (d) SbF4-
Ans. (a) ICl2-
Q.89. Which is acidic oxide?
(a) GeO2 (b) SiO2 (c) SnO2 (d) PbO2
Ans. (b) SiO2
Q.90. Calcium ions are not required for the following:
(a) In blood clotting (b) To maintain regular beating of the heart.
(c) Important in bones (d) Photosynthesis.
Ans. (d) Photosynthesis.
Q.91. Alkali metals are kept in the block of periodic table:
(a) f-Block (b) s-Block (c) d-Block (d) p-Block
Ans. (b) s-Block
Q.92. Higher boranes do not show the following property:
(a) Most of the higher boranes are liquids.
(b) B10H14 cannot be recovered from aqueous solutions.
(c) B6H10 is solid.
(d) As molecular weight increases, gradually become more stable in air.
Ans. (c) B6H10 is solid.
Q.93. For alkali metals, the sequence of increasing covalent character is:
(a) MCl < MBr < MF < MI (b) MI < MCl < MF < MBr
(c) MBr < MI < MCl < MF (d) MF < MC1 <MBr < MI
Ans. (d) MF < MC1 <MBr < MI
Q.94. Sodim imparts the following colour to an oxidizing flame:
(a) Blue (b) Yellow (c) Violet (d) Red-violet
Ans. (b) Yellow
Q.95. Halogens do not show the following property:
(a) All are diatomic
(b) F2 is the strongest oxidizing halogen.
(c) Occur in the free elemental state in nature.
(d) They are most reactive non-metals.
Ans. (c) Occur in the free elemental state in nature.
Q.96. CO does not show the following property:
(a) It is colourless. (b) It is a non-poisonous gas.
(c) It is a reducing agent. (d) It combines with chlorine.
Ans. (b) It is a non-poisonous gas.
Q.97. What is wrong?
(a) Pentabromide is known only for P. (b) BiCl5 is known.
(c) Trihalides are known for all the group 15 elements.
(d) BiF5 exists.
Ans. (b) BiCl5 is known.
Q.98. Polyhalides do not show the following property:
(a) They are soluble in water. (b) They are covalent compounds.
(c) Conducts electricity when in solution
(d) No F3- compounds are known.
Ans. (b) They are covalent compounds.
Q.99. Lithium shows similarities to:
(a) Chlorine (b) Gold (c) Aluminium (d) Magnesium
Ans. (d) Magnesium
Q.100. Which is liquid?
(a) Bromine (b) Chlorine (c) Iodine (d) Fluorine
Ans. (a) Bromine
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