12th class (Fsc) Chemistry unit 2 MCQs
76. Chile saltpaper has the chemical formula:
a. Na2B4O7
b. NaNO3
c. Na2CO3.H2O
d. KNO2
77. The mineral CaSO4 .H2O has the general name:
a. Calcite
b. Gypsum
c. Epsom salt
d. Dolomite
78. Down’s cell is used to prepare:
a. Sodium metal
b. Sodium carbonate
c. Sodium hydroxide
d. Sodium bicarbonate
79. Which element is deposites at the cathode during the electrolysis of brine in diaphragn cell?
a. Cl2
b. H2
c. O2
d. Na
80. Elements of group IIA are called:
a. Coinage metals
b. Alkali metals
c. Halogens
d. Alkaline earth metals
81. which of the following element has lowest ionization energy?
a. Carbon
b. Beryllium
c. Oxygen
d. Boron
82. Which element has lowest melting point:
a. Calcium
b. Beryllium
c. Barium
d. Magnesium
83. which is the least reactive of all the alkali metals?
a. K
b. Li
c. Cs
d. Na
84. Which one does not belong to the alkali earth metals?
a. Ra
b. Be
c. Rn
d. Ba
85. The only alkaline earth metal which form peroxide?
a. Calcium
b. Beryllium
c. Barium
d. Magnesium
86. The mineral CaSO4 has the general name:
a. Calcite
b. Gypsum
c. Epsom salt
d. Dolomite
87. Chemical formula of magnestic is:
a. MgSO4
b. CaMg(SiO3)4
c. MgCl2
d. MgCO3
88. Which one of the halogens is a liquid?
a. Br2
b. F2
c. I2
d. CI2
89. Dolomite is a carbonate of:
a. Ba
b. Sr
c. K
d. Mg
90. The only alkaline earth metal which on reaction with oxygen at 500-600oC forms peroxide is:
a. Calcium
b. Berilium
c. Barium
d. Magnesium
91. LiNO3 decompose to give products:
a. Li2O+NO
b. Li2O+NO2+O2
c. Li2O2 +NO+O2
d. Li2O+NO+O2
92. Which is isoluble in water?
a. BaO
b. CaO
c. MgO
d. SrO
93. Which of the following sulphates is not slouble in water?
a. Zinic sulphate
b. Sodium sulphate
c. Barium suplhate
d. Potassium
94. Indicate amphoteric oxide:
a. SrO
b. MgO
c. CaO
d. BeO
95. Which element is deposited at the cathode during the electrolysis of brine in diaphragn cell?
a. Cl
b. H2
c. O2
d. Na
96. Plaster of Paris can be obtained from:
a. Gypsum
b. Marble
c. Limestone
d. Bauxite
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