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

In S_N1 reactions, the correct order of reactivity for the following compounds:

CH₃Cl, CH₃CH₂Cl, (CH₃)₂CHCl and (CH₃)₃CCl is ______.

If a rocket runs on fuel (C₁₅ H₃₀) and liquid oxygen, the weight of oxygen required and CO₂ released for every Iitre of fuel respectively are ______.

(Given: density of the fuel is 0.756 g/mL)

What volume of hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

The bond order in NO is 2.5 while that in NO⁺ is 3. Which of the following statements is true for these two species?

Bond distance in HF is 9.17 × 10⁻¹¹ m. Dipole moment of HF is 6.104 × 10⁻³⁰ Cm. The percentage of ionic character in HF will be ______.

(electron charge = 1.60 × 10⁻¹⁹ C)

Optical activity of an enantiomeric mixture is +12.6° and the specific rotation of (+) isomer is +30°. The optical purity is ______ %.

The decreasing order of reactivity of the following compounds towards nucleophilic substitution (S_N2) is ______.

A solution of phenol in chloroform when treated with aqueous NaOH gives compound P as a major product. The mass percentage of carbon in P is ______. (to the nearest integer) (Atomic mass: C = 12; H = 1; O = 16)

Which of the following will not show mutarotation?

What is DDT among the following?

Which of the following statements about low density polythene is false?

Which of the following is structure of a separating funnel ?

The stepwise formation of [Cu(NH₃)₄]²⁺ is given below:

\[\ce{Cu^{2+} + NH3 <=>[K1] [Cu(NH3)]^{2+}}\]

\[\ce{[Cu(NH3)]^{2+} + NH3 <=>[K2] [Cu(NH3)2]^{2+}}\]

\[\ce{[Cu(NH3)2]^{2+} + NH3 <=>[K3] [Cu(NH3)3]^{2+}}\]

\[\ce{[Cu(NH3)3]^{2+} + NH3 <=>[K4] [Cu(NH3)4]^{2+}}\]

The value of stability constants K₁, K₂, K₃ and K₄ are 10⁴, 1.58 × 10², 5 × 10³ and 10² respectively. The overall equilibrium constant for dissociation of [Cu(NH₃)₄]²⁺ is x × 10⁻¹². The value of x is ______. (Rounded-off to the nearest integer)

At 1990 K and 1 atm pressure, there are equal numbers of Cl₂ molecules and Cl atoms in the reaction mixture. The value of K_p for the reaction Cl₂(g) ⇌ 2Cl(g) under the above conditions is x × 10⁻¹. The value of x is ______. (Rounded-off to the nearest integer)

In chromatography technique, the purification of compound is independent of ______.

The process that involves the removal of sulphur from the ores is ______.

For the reaction \[\ce{A(g) <=> B(g)}\] at 495 K, ΔG° = −9.478 kJ mol⁻¹

If we start the reaction in a closed container at 495 K with 22 millimoles of A, the amount of B in the equilibrium mixture is ______ millimoles. (Round off to the Nearest Integer).

[R = 8.314 J mol⁻¹ K⁻¹; ln 10 = 2.303]

The polymer formed on heating Novolac with formaldehyde is ______.

An equilibrium system for the reaction between hydrogen and iodine to give hydrogen iodide at 765 K in a 5 litre volume contains 0.4 mole of hydrogen, 0.4 mole of iodine and 2.4 moles of hydrogen iodide.

\[\ce{H2 + I2 <=> 2HI}\]

The equilibrium constant for the reaction is:

A sample of U²³⁸ (half-life = 4.5 × 10⁹ years) ore is found to contain 23.8 g of U²³⁸ and 20.6 g of Pb²⁰⁶. The age of the ore is ______ × 10⁹ years.