Chemistry

NEET Class 12

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1.

At identical temperature and pessure, the ratio of diffusion of hydrogen gas is $\sqrt[3]{3}$ times that of a hydrocarbon having molecular formula C_{n}H_{2n-2}. What is the value of 'n'?

1

4

3

8

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Which of the following thermodynamic relation is correct ?

dG = Vdp- SdT

dE = pdV + TdS

dH = -Vdp + Tds

dG = Vdp + SdT

A.

dG = Vdp- SdT

The correct thermodynamic relation is

dG = dH - TdS - SdT (as G = H - TS)

Again, H = E + pV

$\therefore $ dH = dE +pdV +Vdp and dE = TdS - pdV

Thus, dG = (TdS - pdV) +pdV + Vdp - TdS - SdT

= Vdp - SdT

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4.

Calculate K_{c} for the reversible process given below if K_{p} = 167 and T = 800°C

CaCO_{3} (s) $\rightleftharpoons $ CaO (s) + CO_{2} (g)

1.95

1.85

1.89

1.60

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5.

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?

The backward reaction has higher activation energy than the forward reaction.

The backward and the forward processes have the same activation energy.

The backward reaction has lower activation energy

No activation energy is required at all since energy is liberated in the process.

6.

In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is

a perfect ellipse

a closed ellipse-like curve, narrower at the perihelion position and flatter at the aphelion position

a closed loop on spherical surface

a rosette

7.

In the reaction of sodium thiosulphate with I_{2} in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

molar mass of sodium thiosulphate

the average of molar masses of Na

_{2}S_{2}O_{3}and I_{2}half the molar mass of sodium thiosulphate

molar mass of sodium thiosulphate × 2

8.

0.1M HCl and 0.1M H_{2}SO_{4} each of volume 2 mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01N NaCl solution. The pH of the resulting mixture is

1.17

1.0

0.3

log 2 - log 3

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9.

The molarity of a NaOH solution by dissolving 4 g of it in 250 mL water is

0.4 M

0.8 M

0.2 M

0.1 M

10.

If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge.

S

^{1-}Si

^{2-}P

^{3-}S

^{2-}

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