MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

Calculate van't Hoff-factor for 0.2 m aqueous solution of KCl which freezes at - 0.680°C. (K_f = 1.86 K kg mol^-1).

What is the energy in joules released when an electron moves from n = 2 to n = 1 level in a hydrogen atom?

Which among the following oxides of nitrogen is called nitrogen sesquioxide?

If the van't Hoff-factor for 0.1 M Ba(NO₃)₂ solution is 2.74, the degree of dissociation is ______.

If K_sp of a sparingly soluble salt M₂X at 25°C is 1.0 × 10⁻¹¹, the solubility of the salt in mole litre⁻¹ at this temperature will be ____________.

Daily requirement of energy of a person is 'x' kJ. If heat of combustion of food material (Molecular mass = 100 g) is 'y' kJ, his daily consumption of the food in gram would be ____________.

The volume in dm³ occupied by 15.0 g of ethane at STP is ____________.

The standard heats of formation in kcal mol⁻¹ of NO_2(g) and N₂O_4(g) are 8.0 and 2.0 respectively. The heat of dimerization of NO₂ in kcal is ____________.

\[\ce{2NO2_{(g)} ⇌ N2O4_{(g)}}\]

The enthalpy change accompanying a reaction in which 1 mole of the substance in the standard state reacts completely with oxygen or is completely burnt is called as ____________.

The spectral line obtained when an electron jumps from n = 5 to n = 2 level in hydrogen atom belongs to the ____________ series.

The volume of 1 mole of any pure gas at standard temperature and pressure is always equal to ______.

Which of the following is also called as nitrogen sesquioxide?

Which of the following acts as oxidising agent in a hydrogen-oxygen fuel cell?

In ozone molecule the formal charge on the central oxygen atom is ______.

Osmotic pressure of a urea solution at 10°C is 500 mm Hg. Osmotic pressure of the solution become 105.3 mm Hg, when it is diluted and temperature is raised to 25°C. The extent of dilution is ____________.

0.6 g of a solute is dissolved in 0.1 L of a solvent which develops an osmotic pressure of 1.23 atm at 27°C. The molecular mass of the solute is ______.

Relationship between van't Hoff's factor (i) and degree of dissociation (α) is ______.

lf, \[\ce{C_{(s)} + O2_{(g)} -> CO2_{(g)}}\], ∆H = x .........(i)

\[\ce{CO_{(g)} + 1/2O2_{(g)} -> CO2_{(g)}}\], ∆H = y .......(ii)

Then, the heat of formation of CO is:

A particle has a mass of 0.002 kg and uncertainty in its velocity is 9.2 × 10⁻⁶ m/s, then uncertainty in position is ≥ ____________.

(h = 6.6 × 10⁻³⁴ J s)

\[\ce{S + 3/2O2 -> SO3 +2{x} kcal}\] .........(i)

\[\ce{SO2 + 1/2O2 -> SO3 + {y} kcal}\] .......(ii)

The heat of formation of SO₂ is ____________.