JEE Main entrance exam Question Bank Solutions

Production of iron in a blast furnace follows the following equation:

\[\ce{Fe3O4 (s) + 4CO (g) -> 3Fe (l) + 4CO2 (g)}\]

When 4.640 kg of Fe₃O₄ and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is:

[Given: Molar Atomic mass (g mol⁻¹): Fe = 56

Molar Atomic mass (g mol⁻¹): O = 16

Molar Atomic mass (g mol⁻¹): C = 12]

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)

The Born-Haber cycle for KCI is evaluated with the following data:

`Delta "H"_"f"^"o"` for KCl = - 436.7 kJ mol^-1;

`Delta "H"_"f"^"o"` for K = 89.2 kJ mol^-1

`Delta "H"_"ionization"^"o"` for K = 419.0 kJ mol^-1 `Delta "H"_"ionization"^"o"` for Cl_(g) = - 348.6 kJ mol^-1 

`Delta "H"_"bond"^"o"` for Cl₂ = 243.0 kJ mol^-1

The magnitude of lattice enthalpy of KCl in kJ mol^-1 is ______. (Nearest integer)

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:

The free energy change is ______ kJ mol^-1 when 1 mole of NaCl is dissolved in water at 25°C. Lattice energy of NaCl = 777.8 kJ mol^-1; ΔS for dissolution = 0.043 kJ mol^-1; and hydration energy of NaCl = - 774.1 kJ mol^-1.

In the following reaction

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

Rate of the reaction is the highest for ______.

The enthalpy of neutralisation of NH₄OH with HCl is −51.46 kJ/mol⁻¹ and the enthalpy of neutralisation of NaOH with HCl is −55.90 kJ/mol⁻¹. The enthalpy of ionisation of NH₄OH is ______.

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:

Lattice enthalpy and enthalpy of the solution of NaCl are 788 kJ mol⁻¹ and 4 kJ mol⁻¹, respectively. The hydration enthalpy of NaCl is ______.

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