NEET TEST SERIES 112 CHEMISTRY

1. After understanding the assertion and reason, choose the correct option.
Assertion: In the bonding molecular orbital (MO) of H₂, electron density is increased between the nuclei.
Reason: The bonding MO is , which shows destructive interference of the combining electron waves.

(a) Assertion is incorrect, reason is correct.
(b) Assertion is correct, reason is incorrect.
(c) Assertion and reason are correct and reason is the correct explanation for the assertion.
(d) Assertion and reason are correct, but reason is not the correct explanation for the assertion

3. For silver, Cp(JK-1mol-1) =23+0.01T. lf the temperature (T) of 3 moles of silver is raised from 300 K to 1000 K at 1 atm pressure, the value of will be close to:

(a) 62 kJ
(b) 16 kJ
(c) 21 kJ
(d) 13

4. A flask contains a mixture of isohexane and 3- methylpentane. One of the liquids boils at 63 °C while the other boils at 60 °C. What is the best way to separate the two liquids and which one will be distilled out first?

(a) fractional distillation, isohexane
(b) simple distillation, 3-methylpentane
(c) simple distillation, isohexane
(d) fractional distillation, 3-methylpentane

7. Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): Sn in +2 oxidation state act as a good reducing agent while Pb in +4 oxidation state act as a good oxidising agent.

Reason (R): Due to inert pair effect Pb in +2 oxidation state is stable.

In the light of the above statements, choose the correct answer from the options given below:

(a) A is true but R is false.
(b) A is false but R is true.
(c) Both A and R are true and R is the correct explanation of A
(d) Both A and R are true but R is NOT the correct explanation of A.

8. In order to oxidise a mixture of one mole of each of FeC₂O₄, Fe₂ (C₂O₄ )₃, FeSO₄ and Fe₂(SO₄ )₃ in acidic medium, the number of moles of KMnO₄ required is:

(a) 2
(b) 1
(c) 3
(d) 13

9. ∆_f G° 500 K for substance ‘S’ in liquid state and gaseous state are +100.7 kcal mol^-1 and + 103 kcal mol^-1 respectively. Vapour pressure of liquid ‘S’ at 500K is approximately equal t0: (R=2 cal K^-1 mol^-1 ) .

(a) 100 atm
(b) l atm
(c) 10 atm
(d) 0.1 atm

10. Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R”.
Assertion A: In the complex Ni(CO)4 and Fe(CO)5 , the metals have zero oxidation state
Reason R: Low oxidation states are found when a complex has ligands capable of rc-donor character in addition to the cr-bonding. In the light of the above statements, choose the most appropriate answer from the option given below.

(a) A is correct but R is not correct
(b) A is not correct but R is correct
(c) Both A and R are correct but R is .NOT the correct explanation of A
(d) Both A and R are correct and R is the correct explanation of A.

11. According to molecular orbital theory, the species among the following that does not exist is

12 .If the magnetic moment of a dioxygen species is 1.73 B.M, it may be:

13. In Dumas method for the estimation of N„ the sample is heated with copper oxide and the gas evolved is passed over:

(a) Ni
(b) Copper gauze
(c) Pd
(d) Copper oxide

14. Given below are two statements:
Statement I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom.
Statement II : The group is migrated in Hofmann degradation reaction to electron deficient atom. In the light of the above statement, choose the most appropriate answer from the options given below:

(a) Both Statement 1 and Statement II are correct.
(b) Both Statement I and Statement II are incorrect.
(c) Statement 1 is correct but Statement II is incorrect.
(d) Statement 1 is incorrect but Statement II is correct.

15. In a compound C, 11 and N atoms are present in 9:1:3.5 by weight. Molecular weight of compound is 108. Molecular formula of compound is

16. The transition element that has lowest enthalpy of atomisation is:

(a) Fe
(b) Cu
(c) V
(d) Zn