National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-12

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Q: 54. Cyanide ion is a very good complexing agent and also functions as a reducing agent. Hence may cyanide complexes of metals are known. Addition of an aqueous solution of to a solution of copper sulphate yields a white precipitate which is soluble in excess of aqueous KCN to form the complex:

(A)

(B)

(C)

(D)

Answer: (C)

Q: 55. When a certain metal was irradiated with light of frequency Hz, the photoelectrons emitted had twice the kinetic energy as did the photoelectrons emitted when the same metal was irradiated with light of frequency Hz. The of the metal is

(A)

(B)

(C)

(D)

Answer: (C)

Q: 56. The major product ‘S’ of the following reaction sequence is

Q_56_Structure of Reaction Major Product ‘S’

(A)

Q_56_A_Structure of Bromine for Reaction

(B)

Q_56_B_Structure of Bromine for Reaction

(C)

Q_56_C_Structure of Bromine for Reaction

(D)

Q_56_D_Structure of Bromine for Reaction

Answer: N/A

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