National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-15

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Q: 66. Spodoptol, a sex attractant, produced by a female fall armyworm moth, can be prepared as follows. The structure of Spodoptol is

( terminal alkynes ∼ 25, alcohols ∼ 17)

Q 66 Structure of Spodoptol

Q 66 Structure of Spodoptol

Q 66 Structure of Spodoptol

(A)

(B)

Q 66 B Structure of Spodoptol

Q 66 B Structure of Spodoptol

Q 66 B Structure of Spodoptol

(C)

Q 66 C Structure of Spodoptol

Q 66 C Structure of Spodoptol

Q 66 C Structure of Spodoptol

(D)

Answer: (B)

Q: 67. Passing gas into a mixture of in an acidified aqueous solution precipitates.

(A)

(B)

(C)

(D)

Answer: (A)

Q: 68. Battery acid has density of this acid is diluted to 1L. 25.0 of this diluted solution requires 25.0 of 0.1 N sodium hydroxide solution for neutralization. The percentage of sulphuric acid by mass in the battery acid is

(A) 98

(B) 38

(C) 19

(D) 49

Answer: (B)

Q: 69. The compound that reacts fastest with methylamine is

(A)

Q 69 A Structure of Methylamine

Q 69 a Structure of Methylamine

Q 69 A Structure of Methylamine

(B)

Q 69 B Structure of Methylamine

Q 69 B Structure of Methylamine

Q 69 B Structure of Methylamine

(C)

Q 69 C Structure of Methylamine

Q 69 C Structure of Methylamine

Q 69 C Structure of Methylamine

(D)

Q 69 D Structure of Methylamine

Q 69 D Structure of Methylamine

Q 69 D Structure of Methylamine

Answer: (A)

Q: 70. is prepared by two different methods : one shows yellow colour while the other shows red colour. The difference in colour is due to difference in

(A) Electronic d-d transitions

(B) Particle size

(C) Frenkel defect

(D) Schottky defect

Answer: (B)

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