n-propyl bromide on treating with alcoholic KOH produces propene

259.    n-propyl bromide on treating with alcoholic KOH produces

(A) propane

(B) propene

(C) propyne

(D) propanol

Answer:: (B)

260.    Of the following complex ions, which is diamagnetic in nature?

(A) [CoF6]3–

(B) [NiCl4]2–

(C) [Ni(CN)4]2–

(D) [CuCl4]2–

Answer:: (C)

261.    Of the following which one is classified as polyester polymer?

(A) Nylon-66

(B) Terylene

(C) Backelite

(D) Melamine

Answer:: (B)

262.      One dm3 solution containing 10-5 moles each of Cl- ions and CrO ions is treated

with 10-4 mole of silver nitrate. Which one of the following observations is made?

[KSP Ag2 CrO4, = 4 X 10-12]

[KSP AgCl = 1 x10-10]

(A) Silver chromate gets precipitated first.

(B) Precipitation does not occur.

(C) Both silver chromate and silver chloride start precipitating simultaneously.

(D) Silver chloride gets precipitated first.

Answer:: (D)

263.    One gram of silver gets distributed between 10 cm3 of molten zinc and 100 cm3 of molten lead at 800°C. The percentage of silver in the zinc layer is approximately ______.

(A) 91

(B) 89

(C) 94

(D) 97

Answer:: (D)

264.      One mole of an organic compound 'A' with the formula C3H8O reacts completely with two moles of HI to form X and Y. When 'Y' is boiled with aqueous alkali forms Z.Z

Answer:s the iodoform test. The compound 'A' is ______.

(A) Propan -1 -o1

(B) Propan -2 -o1

(C) methoxyethane

(D) ethoxyethane

Answer:: (C)