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JEE Chemistry Solved Question Paper 2016

Multiple Choice Questions

21.

Number of acyclic structural isomers of the compound having the molecular formula C₄H₁₀O is

22.

If 27 g of water is formed during complete combustion of pure propene (C₃H₆), the mass of propene burnt is

42 gm
21 gm
14 gm
56 gm

23.

The various types of hydrides and examples of each type are given below.

Hydride types Compounds

A. Electron deficient i. LiH

B. Saline ii. CH₄

C. Electron iii. NH₃

D. Interstitial iv. B₂H₆

E. Electron rich v. CrH

Choose the correct matching from the codes given below:

A - ii; B - iv; C - v; D - iii; E - i
A - iv; B - i; C - ii; D - v; E - iii
A - iv; B - iii; C - v; D - ii; E - i
A - v; B - iii; C - iv; D - ii; E - i

24.
The second ionisation enthalpy of which of the following alkaline earth metals is the highest?

Be

Ba

Mg

Ca

As all members of the given options belongs to the same group, therefore, size will decide the amount of 2nd ionisation energy.

$∵ IE \propto \frac{1}{size}$

Thus, smaller is the size, more is the consation energy, Therefore, Be has highest second ionisation enthalpy.

25.

Choose the correct matching of transition metal ion and magnetic moment from the codes given below. (Atomic number: Ti = 22, V =23, Fe= 26)

Transition element Magnetic moment (BM)

A. Titanium (III) i. 4.9

B. Vanadium (II) ii. 1.73

C. Iron (II) iii. 3.87

A - ii; B - iii; C - i
A - ii; B - i; C - iii
A - i; B - ii; C - iii
A - i; B - iii; C - ii

26.

31 g of ethylene glycol (C₂H₆O₂) is mixed with 500 g of solvent (K_f of the solvent is 2 K kg mol^-1 ). What is the freezing point of the solution (in K)? (Freezing point of solvent = 273 K)

27.

The standard reduction potential for Zn²⁺ /Zn, Ni²⁺ /Ni and Fe²⁺/Fe are respectively -0.76, -0.23 and -0.44 V. The reaction X + Y²⁺→ X²⁺ + Y will have more negative $∆$ G value when X and Y are

X = Ni; Y = Fe
X = Ni; Y = Zn
X = Fe; Y = Zn
X = Zn; Y = Ni

28.

An element crystallising in body centred cubic lattice has an edge length of 500 pm. If its density is 4 g cm^-3, the atomic mass of the element (in g mol^-1) is (consider N_A= 6 × 10²³)

29.

The rate constant of the reaction, 2N₂O₅ → 4NO₂ + O₂ at 300 K is 3 × 10^-5 s^-1. If the rate of the reaction at the same temperature is 2.4 × 10^-5 mol dm^-3 s^-1, then the molar concentration of N₂O₅ is

0.4 M
0.8 M
0.04 M
0.08 M

30.

In the reaction, A → Products, when the concentration of A was reduced from 2.4 × 10^-2 M to 1.2 × 10^-2 M, the rate decreased 8 times at the same temperature; The order of the reaction is