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NEET Chemistry Solved Question Paper 2013

Multiple Choice Questions

31.
A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm³. The molar mass of the metal is (N_A vogadro's constant = 6.02x 10²³ mol^-1).

40 g mol^-1

30 g mol^-1

27g mol^-1

20 g mol^-1

27g mol^-1

Given, cell is fcc, so Z = 4
Edge length, a= 404 pm= 4.04 x 10^-8cm
Density of metal, d= 2.72 g cm^-3
N_A = 6.02 x 10²³ mol^-1
Molar mass of the metal, M=?
We know that,

$density, d = \frac{Z \times M}{a^{3} \cdot N_{A}} therefore, M = \frac{d \cdot a^{3} \cdot N_{A}}{Z} = \frac{2.72 \times (4.04 \times 10^{- 8})^{3} \times 6.02 \times 10^{23}}{4} = 27 g {mol}^{- 1}$

32.

A magnetic moment of 1.73 BM will be shown by one among the following

[Cu(NH₃)₄]²⁺
[Ni(CN)₄]^2-
TiCl₄
[CoCl₆]^4-

33.

Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur. and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never been insolated. The gas X is

H₂S
SO₂
CO₂
SO₃

34.

Which is the strongest acid in the following?

H₂SO₄
HClO₃
HClO₄
H₂SO₃

35.

Which of the following does not give oxygen on heating?

KClO₃
Zn(ClO₃)₂
K₂Cr₂O₇
(NH₄)₂Cr₂O₇

36.

Which ofthe following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb= 70)

Ce²⁺
Sm²⁺
Eu²⁺
Yb²⁺

37.

Which of the following is a polar molecule?

BF₃
SF₄
SiF₄
XeF₄

38.

Reaction by which benzaldehyde cannot be prepared?

39.

Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is

40.

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following is not true.

A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant.
Chlorine and iodine are used as strong disinfectants.
Dilute solutions of boric acid and hydrogen, peroxide are strong antiseptics.
Disinfectants harm the living tissues.