National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-5

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Q: 18. Three Faradays of electricity are passed through aqueous solutions of and kept in three vessels using inert electrodes. The ratio (in moles) in which the metals are deposited is:

(A)

(B)

(C)

(D)

Answer: (C)

Q: 19. Nepetalactone (X) is isolated as an oil from Catnip.

Q 19 Image of Nepetalactone

Q 19 Image of Nepetalactone

Q 19 Image of Nepetalactone

The number of chiral carbon atoms and the amount of KOH consumed by 83 mg of Nepetalactone are respectively

(A)

(B)

(C)

(D)

Answer: (D)

Q: 20. Number of P-S single bonds and P-S double bonds (P=S) in are respectively

(A)

(B)

(C)

(D)

Answer: (D)

Q: 21. If the solubility product of iron (III) hydroxide is , the pH of a saturated Solution of iron(III) hydroxide in distilled water is close to

(A) 4

(B) 5

(C) 7

(D) 9

Answer: (C)

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