NEET PYQs for Chemical Reactions with Solutions: Practice NEET Previous Year Questions

1.

For a reaction A\(\rightarrow\)B, the enthalpy of the reaction is −4.2 kJ mol⁻¹ and the enthalpy of activation is 9.6 kJ mol⁻¹. The correct potential energy profile for the reaction is shown in option

2.

Match List I with List II

List-I (Reaction)		List-II  (Reagents/Condition)
(A)		(I)
(B)		(II)	CrO3
(C)		(III)	KMnO4/KOH, \(\Delta\)
(D)		(IV)	(i) O3 (ii) Zn-H2O

Choose the correct answer from the options given below:

• A-IV, B-I, C-III, D-II
• A-III, B-I, C-II, D-IV
• A-IV, B-I, C-II, D-III
• A-I, B-IV, C-II, D-III

3.

Which of the following reactions is the metal displacement reaction? Choose the right option.

• Noble gases have large positive values of electron gain enthalpy

• Noble gases are sparingly soluble in water

• Noble gases have very high melting and boiling points

• Noble gases have weak dispersion forces

4.

Which of the following reactions is the metal displacement reaction ? Choose the right option.

• $2KClO_3 {->[\Delta]} 2KCl + 3O_2$
• $Cr_2O_3 + 2Al {->[\Delta]} Al_2O_3 + 2Cr$
• $Fe + 2HCl \to FeCl_2 + H_2 \uparrow$
• $2Pb(NO_3)_2 \to 2PbO + 4NO_2 + O_2 \uparrow$

5.

Activation energy of any chemical reaction can be calculated if one knows the value of

• rate constant at standard temperature.
• probability of collision
• orientation of reactant molecules during collision.
• rate constant at two different temperatures

6.

For given reaction: 

‘P’ is

7.

Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as:

• Aldol condensation
• Cannizzaro's reaction
• Cross Cannizzaro's reaction
• Cross Aldol condensation

8.

The rate of a reaction quadruples when temperature changes from 27°c to 57°c. Calculate the energy of activation
Given R=8.314 J K-1 mol-1, log 4=0.6021

• 38.04 KJ/mol
• 380.4 KJ/mol
• 3.80 KJ/mol
• 3804 KJ/mol

9.

The products A and B obtained in the following reactions, respectively, are
3ROH+PCI₃→3RCI+A 
ROH+PCI₅→RCI+HCI+B

• POCI₃ and H₃PO₃
• POCI₃ and H₃PO₄
• H₃PO₄ and POCI₃
• H₃PO₃ and POCI₃

10.

The major product formed in dehydrohalogenation reaction of $2-Bromo$ pentane is $Pent-2-ene$. This product formation is based on ?

• Saytzeff's Rule
• Hund’s Rule
• Hofmann Rule
• Huckel’s Rule

11.

Identify the major product C formed in the following reaction sequence: 

• Propylamine
• Butylamine
• butanamide
• α-bromobutane acid

12.

For the reaction 2A⇋ B + C, KC = 4 × 10^–3 . At a given time, the composition of reaction mixture is: [A] = [B] = [C] = 2 × 10–3 M. Then, which of the following is correct?

• Reaction is at equilibrium.
• Reaction has a tendency to go in forward direction.
• Reaction has a tendency to go in backward direction.
• Reaction has gone to completion in forward direction.

13.

Identify the correct reagents that would bring about the following transformation.

• (i) H₂O/H⁺
  (ii) CrO₃
• (i) BH₃
  (ii) \(H_2O_2/O^\ominus H\)
  (iii) PCC
• (i) BH₃
  (ii) \(H_2O_2/O^\ominus H\)
  (iii) alk. KMnO₄
• (iv)\(H_3O^\oplus\)
  (i) H₂O/H⁺
  (ii) PCC

14.

The reagents with which glucose does not react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D NH₂OH
E. NaHSO₃
Choose the correct options from the given below:

• B and C
• A and D
• B and E
• E and D

15.

The correct order of the basic strength of methyl substituted amines in aqueous solution is:

• \((CH_3)_2NH>CH_3NH_2> (CH_3)_3N\)
• \((CH_3)_2N> CH_3NH_2>(CH_3)_2NH\)
• \((CH_3)_2N>(CH_3)_2NH>CH_3NH_2 \)
• \(CH_3NH_2>(CH_3)_2NH>(CH_3)_3N \)