JEE Main entrance exam Question Bank Solutions for Chemistry (JEE Main)

Sugar moiety in DNA and RNA molecules respectively are ______.

Given below are two statements:

Statement I: H₂O₂ can act as both oxidising and reducing agent in basic medium.

Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen.

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

The product "P" in the above reaction is:

The increasing order of the following compounds towards HCN addition is:

(i)
(ii)
(iii)
(iv)

AB₃ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is ______. (Integer answer)

Identify 'Z' in the reaction given below:

In the following reaction

\[\ce{Carbonyl compound + MeOH <=>[HCl] acetal}\]

Rate of the reaction is the highest for ______.

An aqueous KCl solution of density 1.20 g mL^-1 has a molality of 3.30 mol kg^-1. The molarity of the solution in mol L^-1 is ______. (Nearest integer)

Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?

With increase of temperature, which of these changes?

What quantity (in mL) of a 45% acid solution of a monoprotic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution?

250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to ______.

(Given: Atomic weights are H, 1u; C, 12u; O, 16u)

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?

(A) NO

(B) N₂

(C) O₂

(D) C₂

(E) B₂

Choose the most appropriate answer from the options given below:

Given below are the critical temperatures of some of the gases:

The gas showing the least adsorption on a definite amount of charcoal is:

Which among the above compound/s does/do not form Silver mirror when treated with Tollen's reagent?

Among the following, the aromatic compounds are:

(A)
(B)
(C)
(D)

Choose the correct answer from the following options:

The major products formed in the following reaction sequence A and B are:

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:

The correct set of products obtained in the following reactions:

1. \[\ce{RCN ->[reduction]}\]
2. \[\ce{RCN ->[(i) CH3MgBr][(ii) H2O]}\]
3. \[\ce{RNC ->[hydrolysis]}\]
4. \[\ce{RNH2 ->[HNO2]}\]

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron?

(A) NO

(B) N₂

(C) O₂

(D) C₂

(E) B₂

Choose the most appropriate answer from the options given below: