JEE Main entrance exam Question Bank Solutions

The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given by ΔG⁰ = A − BT where A and Bare non-zero constants. Which of the following is true about this reaction?

A diluted solution of sulphuric acid is electrolyzed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ______ cm³. (Nearest integer)

[Given: Faraday constant F = 96500 C mol^–1 at STP, molar volume of an ideal gas is 22.7 L mol^–1]

The end product Y in the sequence of reaction:

\[\ce{RX ->[CN^-] X ->[NaOH] Y}\] is:

A reddish-pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. If on cooling water is added to the residue it turns to original colour. The substance is ______.

Y is:

Alkaline hydrolysis of C₄H₈Cl₂ gives a compound (A) which on heating with NaOH and I₂ produces a yellow precipitate of CHI₃. The compound (A) should be ______.

Among the following which is the best description of water in the solid phase?

A compound 'X' with molecular formula C₃H₈O can be oxidised to a compound 'Y' with the molecular formula C₃H₆O₂ 'X' is most likely to be ______.

Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C. The compound 'C' is ______.

How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g? [Atomic masses: Na = 23, Cl = 35.5]

Two statements are given below:

Statement I: The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with an odd number of carbon atoms acid immediately below and above it in the series.

Statement II: The solubility of monocarboxylic acids in water decreases with increased molar mass.

Choose the most appropriate option:

Which one of the following acids does not exhibit optical isomerism?

\[\ce{CH3CH2COOH ->[Cl2][red P] A ->[alc. KOH] B}\]. What is B?

Orthorhombic crystal has the following unit cell dimensions ______.

Assertion A: Enol form of acetone [CH₃COCH₃] exists in < 0.1% quantity. However, the enol form the acetyl acetone [CH₃COCH₂OCCH₃] exists in approximately 15% quantity.

Reason R: Enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone.

Choose the correct answer:

A certain element crystallises in a bcc lattice of unit cell edge length 27 A°. If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cell in A° will be ______. (Round off to the Nearest Integer).

[Assume each lattice point has a single atom]

When propionamide reacts with Br₂ in the presence of alkali the product is ______.

Na₂CO₃ cannot be used in place of (NH₄)₂CO₃ for the precipitation of the V group because ______.

Gold crystallizes in a face-centered cubic lattice. If the length of the edge of the unit cell is 407 pm. The density of gold assuming it to be spherical is ______ g/cm³. Atomic mass of gold = 197 amu.

The metallic luster exhibited by sodium is explained by ______.