National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-14

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Q: 61. In cold climate, the water in a radiator of car gets frozen causing damage to the radiator. Ethylene glycol is used as an antifreezing agent. The amount of ethylene glycol that should be added to 5 kg of water to prevent it from freezing at – 7°C is

(Given: Molar mass of ethylene )

(A)

(B)

(C)

(D)

Answer: (A)

Q: 62. The ratio of the energy of the electron in ground state of hydrogen atom to that of the electron in the first excited state of is

(A)

(B)

(C)

(D)

Answer: (A)

Q: 63. Water insoluble, but organic solvent soluble, dye is dissolved in three organic solvents and taken in three separating funnels, a b, and c. To each solution, water is added, shaken, and kept undisturbed. The solvent in separating funnels a, b and c from the following figures are respectively

Q 63 Image of Three Separating Funnels

Q 63 Image of Three Separating Funnels

Q 63 Image of Three Separating Funnels

(A)

(B)

(C)

(D)

Answer: (B)

Q: 64. P, Q, R and S are four metals whose typical reactions are given below

(I) Only Q and R react with dilute HCl to give gas

(II) When Q is added to a solution containing the ions of the other metals, metallic P, R and S are formed

(III) P reacts with concentrated but S does not

The correct order of their reducing character is

(A)

(B)

(C)

(D)

Answer: (A)

Q: 65. The electrons identified by quantum number n and I,

(ii)

(iii)

(iv)

Can be placed in order of increasing energy from lowest to highest as

(A)

(B)

(C)

(D)

Answer: (A)

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