Subject

Chemistry

Class

NEET Class 12

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NEET Chemistry Solved Question Paper 2016

Multiple Choice Questions

21.

Which of the following species is not aromatic?

Benzene
Cyclooctatetraenyl dianion
Tropylium ion
Cyclopentadienyl cation

22.

Substances that are oxidised and reduced in the following reaction are respectively

N₂H₄ (l) + 2H₂O₂ (l) $\to$ N₂ (g) + 4H₂O (l)

N₂H₄, H₂O
N₂H₄, H₂O₂
N₂, H₂O₂
H₂O, N₂

23.
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C and it increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is

881.1 kcal

771.2 kcal

981.1 kcal

871.2 kcal

771.2 kcal

Weight of benzoic acid = 1.89 gm

Temperature of bomb calorimeter = 25 $°$ C = 298 K

Mass of water (m) = 18.94 kg = 18940 gm

Increase in temeperature ( $∆$ t) = 0.632 $°$ C

Specific heat of water (s) = 0.998 cal/g-deg.

We know that heat gained by water or heat liberate by benzoic acid (Q) = ms $∆$ t = 18940 $\times$ 0.998 $\times$ 0.632 = 11946.14 cal

Since, 1.89 gm of acid liberates 11946.14 cal of heat.

Therefore heat liberated by 122 gm of acid ( mol. wt. of benzoic acid)

= $\frac{11946.14 \times 122}{1.89}$ = 771126.5 cal = 771.12 kcal.

24.

Which of the following alkenes will give same product by any method out of hydration, hydroboration-oxidation and oxymercuration-demercuration?

CH₃CH=CH₂
CH₃CH=CHCH₃
CH₃CH(CH₃)CH=CH₂

25.

Select the correct statement.

Geometrical isomer may differ in dipole moment and visible/UV spectra.
Complexes of the type [Ma₃b₃] can also have facial (fac) and meridional (mer) isomer.
No optical isomer exists for the complex trans- [Co(en)₂Cl₂]⁺.
All of these.

26.

During the decomposition of H₂O₂ to give oxygen, 48 g O₂ is formed per minute at a certain point of time. The rate of formation of water at this point is

0.75 mol min^-1
1.5 mol min^-1
2.25 mol min^-1
3.0 mol min^-1

27.

The major organic product formed in the following reaction.

28.

Among the following, the achiral amino acid is

2-ethylalanine
2-methylglycine
2-hydroxymethylserine
tryptophan

29.

Assertion : When acetamide reacts with NaOH and Br,, methyl amine is formed.

Reason : The reaction occurs through intermediate formation of isocyanate.

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

30.

Assertion : Chlorobenzene is more reactive than benzene towards the electrophilic substitution reaction.

Reason : Resonance destabilises the carbocation.

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