Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) Practice Sets For WBCS Prelims P2


Chemistry - 02

6. Atoms with the same mass number but having different nuclear charges are called
(A) Isochores
(B) Isotones
(C) Isotopes
(D) Isobars.

Correct Answer: [D] Isobars..
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7. The number of electrons present in H+ is
(A) Zero
(B) One
(C) Two
(D) Three.

Correct Answer: [A] Zero.
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8. The strongest electropositive element is
(A) Mg
(B) K
(C) Cs
(D) Li.

Correct Answer: [C] Cs.
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9. Ethyl alcohol is completely mixed with water. It can be separated from that mixture by
(A) Fractional distillation
(B) Allowing the water to evaporate
(C) Using a separating funnel
(D) Evaporation.

Correct Answer: [A] Fractional distillation.
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10. Which of the following modes of expressing concentrations is independent of temperature?
(A) Normality
(B) Formality
(C) Molarity
(D) Molality.

Correct Answer: [D] Molality..
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