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NEET Chemistry Solved Question Paper 2011

Multiple Choice Questions

11.

Argon is used

in filling airships
to obtain low temperature
in high temperature welding
in radiotherapy for treatment of cancer

12.

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

${}_{8}^{16}O$
${}_{8}^{18}O$
${}_{10}^{18}{Ne}$
${}_{8}^{16}O^{2 -}$

13.

56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atrn. The partial pressures of oxygen and nitrogen (in atm) are respectively

4, 6
5, 5
2, 8
6, 4

14.
The metal that produces red-violet colour in the non-luminous flame is

Ba

Ag

Rb

Pb

Alkali metals and their salts impart a characteristic colour to flame. The reason for flame colouration is that the energy ofthe flame causes an excitation of the outermost electrons which when return to their original position, give out the energy so absorbed in the visible region. Thus, Rb gives red-violet colour to the flame.

15.

According to the first law of thermodynamics which of the following quantities represents the change in a state function?

q_rev
q_rev - W_rev
$\frac{q_{rev}}{W_{rev}}$
q_rev+ W_rev

16.

The expression for the solubility product of Ag₂CO₃ will be

K_sp = s²
K_sp = 4s³
K_sp = 27s⁴
K_sp = s

17.

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second? (h = 6.626x 10^-34 J-s; velocity of light = 3x10⁸ ms^-1)