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NEET Chemistry Solved Question Paper 2013

Multiple Choice Questions

Which of the following element has lowest melting point?

Maximum number of unpaired electrons are present in

Gd³⁺
Yb²⁺
Tb²⁺
Pm³⁺

Total number of antibonding electrons present in O₂ will be

In BF₃, the B - F bond length is 1.30Å, when BF₃ is allowed to be treated with Me₃N, it forms an adduct, Me₃N $\to$ BF₃, the bond length of B - F in the adduct is

greater than 1.30 Å
smaller than 1.30 Å
equal to 1.30 Å
none of these

Which of the following is most basic?

Al(OH)₃
Cr(OH)₃
La(OH)₃
Fe(OH)₃

K₂Cr₂O₇ in acidic medium converts into

Cr²⁺
Cr³⁺
Cr⁴⁺
Cr⁵⁺

7.
A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 x 10^-4 then particle is

neutron

$α$ - particle

deuteron

tritium

neutron

Given : $\frac{λ_{particle}}{λ_{electron}}$ = 1.8 $\times$ 10^-4

and $\frac{ν_{particle}}{ν_{electron}}$ = 3

According to de-Brogile equation, $λ = \frac{h}{mν}$

$\frac{λ_{particle}}{λ_{electron}} = \frac{h}{m_{particle} \times ν_{particle}} \times \frac{m_{electron} \times ν_{electron}}{h} = \frac{m_{electron}}{m_{particle}} \times \frac{ν_{electron}}{ν_{particle}}$

$\Rightarrow 1.8 \times 10^{- 4} = \frac{9.1 \times 10^{- 31} kg}{m_{particle}} \times \frac{1}{3} m_{particle} = \frac{9.1 \times 10^{- 31}}{1.8 \times 10^{- 4} \times 3} = 1.6852 \times 10^{- 27} kg$

Actual mass of neutron is 1.67493 $\times$ 10^-27 kg. Hence, the particle is neutron.

What will be the solubility product of AX₃?

27S⁴
4S³
36S⁴
9S³

Which thermodynamic parameter is not a state function?

q at constant pressure
q at constant volume
W at adiabatic
W at isothermal

10.

Assertion : Bond dissociation energy is F₂ > Cl₂.

Reason : Cl₂ has more electronic repulsion than F₂.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.