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# NEET Chemistry Solved Question Paper 2003

#### Multiple Choice Questions

11.

Assertion : $∆$H and $∆$E are almost the same for the reaction, N2(g) + O2(g)→ 2NO(g)

Reason : All reactants and products are gases.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

B.

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

$∆\mathrm{H}=∆\mathrm{E}+∆\mathrm{nRT}$

$∆$n = chnage in number of mole of products and reactant species.

N2(g) + O2(g)$⇌$2NO(g)

$∆$n = 2 - 2 = 0

$∆\mathrm{H}=∆\mathrm{E}+0×\mathrm{RT}\phantom{\rule{0ex}{0ex}}∆\mathrm{H}=∆\mathrm{E}$

12.

Assertion : The increase in internal energy ($∆$E) for the vapourization of one mole of water at 1 atm and 373 K is zero.

Reason : For all isothermal processes, $∆$E = 0.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

A.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

At 373 Kor 100°C, the water starts boiling and at this temperature the vaporization of water is an isothermal process.

The internal energy change ($∆$E), depend only on temperature, it follows that at constant temperature, the internal energy ofthe gas remains constant, i.e. $∆$E is zero.

13.

Assertion : NF3 is a weaker ligand than N(CH3)3.

Reason : NF3 ionizes to give F- ions in aqueous solution.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

C.

If assertion is true but reason is false.

Due to high cleclronegativity of F-atoms, the lone pair of N-atom in NF3 molecule cannot be ligated easily.

Except, nitrogen fluoride, all other halides hydrolyse in water.

NCl3 + 3H2O → NH3 + 3HClO

14.

In which of the following acid-base titration, pH is greater than 8 at equivalence point?

• Acetic acid versus ammonia

• Acetic acid versus sodium hydroxide

• Hydrochloric acid versus ammonia

• Hydrochloric acid versus sodium hydroxide

B.

Acetic acid versus sodium hydroxide

In acetic acid versus sodium hydroxide titration, pH will be greater than 8 at quivalence point because acetic acid ia a weak acid while sodium hydroxide is a strong base.Therefore, at the equivalent point, there will be enough hydroxide ions left.

15.

Assertion : BaCO3 is more soluble in HNO3 than in plain water.

Reason : Carbonate is a weak base and reacts with the H+ from the strong acid, causing the barium salt to dissociate.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

A.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

BaCO3 is more soluble in HNO3 than in plain water asCarbonate is a weak base and reacts with the H+ from the strong acid, causing the barium salt to dissociate.

BaCO3 + 2HNO3 → Ba(NO3)2 + H2O + CO2

16.

Assertion :${}_{11}{}^{22}\mathrm{Mg}$emits a positron giving${}_{12}{}^{22}\mathrm{Mg}$.

Reason : Inβ+emission neutron is transformed into proton.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

D.

If both assertion and reason are false.

11Na2212Mg22 +1β0

The above reaction involvesβ- particle emission. While positron emission is due to the conversion of proton into neutron.

${}_{1}{}^{1}\mathrm{p}\to {}_{0}{}^{1}\mathrm{n}+{}_{1}{}^{0}\mathrm{\beta }$

# 17.The quantum number m of a free gaseous atom is associated withthe effective volume of the orbital the shape of the orbital the spatial orientation of the orbital the energy of the orbital in the absence of a magnetic field.

C.

the spatial orientation of the orbital

The quantum number m of a free gaseous atom is associated withthe spatial orientation of the orbital. It describes the orientation or distribution of electron cloud.

18.

Assertion : The O - O bond length in H2O2 is shorter than that of O2F2.

Reason : H2O2 is an ionic compound.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

D.

If both assertion and reason are false.

O2F2 has the similar structure as that of H2O2 but the O - O bond length is shorter in O2F2 than in H2O2. This is due to the high electronegativity of attached F-atoms.

19.

The potential energy diagram for a reaction R → P is given in the figure. $∆$H ° of the reaction corresponds to the energy

• a

• b

• c

• a + b

C.

c

In the above diagram,$∆$H° of the reaction corresponds to energy c.

$∆\mathrm{H}$= activation energy of forward reaction - activation energy of backward reaction

= b - a = c

20.

Assertion : Barium is not required for normal biological function in human.

Reason : Barium does not show variable oxidation state.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

A.

If both assertion and reason are true and the reason is the correct explanation of the assertion.

Barium does not show variable oxidation state as it is not required for normal biological function in human.