101. The pair of amphoteric oxides is
A
$$BeO,ZnO$$
B
$$A{l_2}{O_3},L{i_2}O$$
C
$$BeO,B{O_3}$$
D
$$BeO,MgO$$
Answer :
$$BeO,ZnO$$
102. Which of the following statements in relation to the hydrogen atom is correct?
A
$$3s,\,3p$$ and $$3d$$ orbitals all have the same energy
B
$$3s\,{\text{and}}\,3p$$ orbitals are of lower energy than $$3d$$ orbital
C
$$3p$$ orbital is lower in energy than $$3d$$ orbital
D
$$3s$$ orbital is lower in energy than $$3p$$ orbital
Answer :
$$3s,\,3p$$ and $$3d$$ orbitals all have the same energy
103. Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
A
$$BaS{O_4}$$
B
$$SrS{O_4}$$
C
$$CaS{O_4}$$
D
$$BeS{O_4}$$
Answer :
$$BeS{O_4}$$
104. Which category of salts of alkaline earth metals is not found in solid sate, but found in solution state?
A
Carbonates
B
Bicarbonates
C
Hydroxides
D
Sulphates
Answer :
Bicarbonates
105. The low solubility of $$LiF$$ and that of $$CsI$$ in water are respectively due to which of the properties of the alkali metal ions?
A
Higher hydration enthalpy of $$L{i^ + },$$ higher lattice enthalpy of $$C{s^ + }.$$
B
Higher lattice enthalpy of $$L{i^ + },$$ smaller hydration enthalpy of $$C{s^ + }.$$
C
Smaller lattice enthalpy of $$L{i^ + },$$ higher hydration enthalpy of $$C{s^ + }.$$
D
Smaller hydration enthalpy of $$L{i^ + },$$ higher lattice enthalpy of $$C{s^ + }.$$
Answer :
Higher lattice enthalpy of $$L{i^ + },$$ smaller hydration enthalpy of $$C{s^ + }.$$
106. The element $$A$$ burns in nitrogen to give an ionic compound $$B.$$ The compound $$B$$ reacts with water to give $$C$$ and $$D$$. A solution of $$C$$ becomes milky on bubbling carbon dioxide. What is the nature of compound $$D?$$
A
Acidic
B
Basic
C
Amphoteric
D
Neutral
Answer :
Basic
107. All the following substances react with water. The pair that gives the same gaseous product is
A
$$K\,\,{\text{and}}\,\,C{O_2}$$
B
$$Na\,\,{\text{and}}\,\,N{a_2}{O_2}$$
C
$$Ca\,\,{\text{and}}\,\,Ca{H_2}$$
D
$$Ba\,\,{\text{and}}\,\,Ba{O_2}$$
Answer :
$$Ca\,\,{\text{and}}\,\,Ca{H_2}$$
108. Which of the following statement is false ?
A
Strontium decomposes water readily than beryllium.
B
Barium carbonate melts at a higher temperature than calcium carbonate.
C
Barium hydroxide is more soluble in water than magnesium hydroxide.
D
Beryllium hydroxide is more basic than barium hydroxide.
Answer :
Beryllium hydroxide is more basic than barium hydroxide.
109. Which of the following statements is correct regarding alkaline earth metals?
A
Alkaline earth metals are weaker reducing agents than alkali metals.
B
Alkaline earth metal salts are paramagnetic in nature.
C
Alkaline earth metal salts are more soluble than corresponding alkali metal salts.
D
Solubility of sulphates of alkaline earth metals increases from top to bottom in the group.
Answer :
Alkaline earth metals are weaker reducing agents than alkali metals.
110. A certain compound $$X$$ when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound $$X$$ is
A
$${K_2}C{O_3}$$
B
$$KI$$
C
$$KBr$$
D
$${K_3}P{O_4}$$
Answer :
$$KI$$