691. Which is not a colligative property?
A. Osmotic pressure
B. Lowering of vapour pressure
C. Depression of freezing point
D. Elevation of boiling point
692. After three half-lives of a chemical reaction, the percentage fraction of the amount left is?
(A) 12.5
B. 50
(C) 75
(D) 21
693. The unit of the rate constant depends upon?
(A) Order of reaction
B. Concentration terms
(C) Number of reactants
(D) Molecularity of reaction
694. Which of the following statements is correct about the Galvanic cell?
(A) Cathode is positively charged
(B) Reduction occurs at the anode
C. Reduction occurs at the cathode
(D) Anode is negatively charged
695. Which of the following is not an inner transition element?
A. Cerium
(B) Tungsten
(C) Samarium
(D) None of the above
696. Which isotope of hydrogen is radioactive?
(A) Protium
B. Tritium
(C) Deuterium
(D) None of the above
697. Almost all amides exist in?
(A) Gaseous State
(B) Solid State
C. Liquid State
(D) Plasma State
698. Fermentation of ethanol to ethanoic acid is achieved by?
(A) Bacterium Mycoderma Acetic
(B) Zymase
C. Acetic Invertase
(D) Diastase
699. Which bond is most polar?
(A) C – O
(B) O – F
C. C – F
(D) N – F
700. Evaporation of water is:
A. An exothermic change
B. An endothermic change
C. A procedure in which no heat changes
D. A process accompanied by a chemical reaction
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