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NEET Chemistry Solved Question Paper 2017

Multiple Choice Questions

31.
The standard reduction potential for Zn²⁺/Zn, Ni²⁺/Ni and Fe²⁺/Fe are -0.76, -0.23 and -0.44 V, respectively.
The reaction X + Y²⁺ → X²⁺ + Y will be spontaneous when

X = Ni, Y = Fe

X = Ni, Y = Zn

X =Fe, Y = Zn

X = Zn, Y = Ni

X = Zn, Y = Ni

The reaction is spontaneous when ΔG < 0 and E°_cell > 0.

$∆ G = - nFE ° and E ° > 0 Also, E_{cell}^{°} = E_{oxi}^{°} + E_{red}^{°} or E_{cell}^{°} = E_{cathode}^{°} - E_{anode}^{°} Here, x + y^{2 +} \overset{}{\to} x^{2 +} + y x \overset{oxidation}{\to} x^{2 +} y^{2 +} \overset{Reduction}{\to} y Thus, E_{cell}^{°} for (a) - 0.21 V, i . e . E_{cell}^{°} < 0 (b) - 0.53 V, i . e . E_{cell}^{°} < 0 (c) - 0.32 V, i . e . E_{cell}^{°} < 0 (d) 0.53 V, i . e ., E ° > 0$

32.

Which of the following coordination compounds would exhibit optical isomerism?

Pentamminentirocobalt (III) iodide
Tris-(ethylenediamine) cobalt (III) bromide
Trans-dicyanobis (ethylenediamine)
Diamminedinitroplatinum (II)

33.

A solid AB has a NaCl structure. If the radius of cation A⁺ is 170 pm, then the maximum possible radius of the anion B^- is

397.4 pm
347.9 pm
210.9 pm
410.6 pm

34.

A first-order reaction is 50% completed in 1.26 x 10¹⁴s. How much time would it take for 100% completion?

1.26 x 10¹⁵ s
2.52 x 10¹⁴ s
2.52 x 10²⁸ s
Infinite

35.

Flux is used to

remove all type of impurities
reduce metal oxide
remove carbonate and sulphate
remove silica and undesirable metal oxides

36.

Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. The hybridization of the central atom in the anion Y is