List of top Chemistry Questions asked in AIIMS

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : \(ZnO\) becomes yellow when it is heated.

Reason (R) : Metal excess defect arises due to excess of \(Zn^{2+}\) ions which move to interstitial sites and the electron moves to neighbouring interstitial sites.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : LiCl is predominantly a covalent compound. 

Reason (R) : Electronegativity difference between Li and Cl is too small.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Nylon-6 is a condensation polymer. 

Reason (R) : It is a polymer of caprolactum.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Phenol reacts with \(CH_3I\) in presence of NaOH to form methoxybenzene. 

Reason (R) : Phenoxide is better nucleophile than phenol.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : \(I_2O_5\) is used to detect CO.

Reason (R) : In \(I_2O_5\), the oxidation number of I is +5.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : \(BO3^-\) and \(SO^{2-}_3\) are not isostructural. 

Reason (R) : In \(SO^{2-}_{3}\) ,sulphur has one lone pair of electrons.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Bond energy of \(F_2\) is lesser than \(Cl_2\). 

Reason (R) : F-atom is smaller in size than Cl.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : \(ZrI_4\) is useful in purification of zirconium (Zr). 

Reason : \(ZrI_4\) sublimise at room temperature.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : tert-Butyl amine can be formed by Gabriel phthalimide synthesis. 

Reason : It follows \(SN_1\) mechanism.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : \(m\)-Bromotoluene can be prepared from \(m\)-toluidine. 

Reason : Amino group is \(meta\)-directing.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : Two sugar units are joined by 1,2-glycosidic bond in sucralose. 

Reason : Sucralose contains \(C_1\) -glucose and \(C_2\) - fructose glycosidic bond.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : Glyceraldehyde reacts with \(Br_2/ H_2O\) to form achiral compound. 

Reason : \(-CHO\) and \(-CH_2OH\) both are oxidised.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : Lyophilic colloid protects lyophobic colloid. 

Reason : Lyophilic colloid particles cover up the particles of the lyophobic colloid.

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion: \((CH_3)_2NH\) is less basic than \((CH_3)_3N\) in aqueous solution. 

Reason : Hyperconjugation in \((CH_3)_2NH\) is more than that in \((CH_3)_3N\).

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

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion : tert-Butyl methyl ether reacts with \(HBr\) to form fert-butyl bromide and methanol. 

Reason : It follows \(S_N1\) mechanism.

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