631. Which element is deposited at the cathode during the electrolysis of brine in the Nelson cell?
a) H2
b) Cl2
c) Na
d) O2
632. Rectified spirit is converted to absolute alcohol by the dehydrating agent?
a) Sulphuric Acid
b) Soda Lime
c) Lime
d) All of the above
633. Which of the following salt is fairly soluble in water?
a) BeF2
b) MgF2
c) BaF2
d) LiF
634. A metal does float on water gives a vigorous reaction with water so much that it reacts with ice at -100 Degree Centigrade. The metal is?
a) Na
b) Cs
c) Li
d) K
635. Which of the following hybrids is highly unstable?
a) SbH3
b) PH3
c) BiH3
d) AsH3
636. Free energy change for a reversible process is:
A. > 0
B. < 0
C. Equal to zero
D. Unpredictable
637. The intensity expected to raise the temperature of a body by 1 K is called:
A. Specific heat
B. Thermal capacity
C. Water equivalent
D. None of these
638. An adiabatic expansion of an ideal gas always has:
A. Decrease in temperature
B. Q = 0
C. W = 0
D. H = 0
639. ( C_{\text{Graphite}} – C_{\text{Diamond}} ) H = -ve. This shows that:
A. Graphite is more steady than jewel
B. Graphite has more energy than diamond
C. Both are equally stable
D. Stability cannot be predicted
640. Mechanical work is especially important in systems that contain:
A. Solid – Liquid
B. Liquid – Liquid
C. Solid – Solid
D. Gases
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