HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Compare the structures of H₂O and H₂O₂.

Lithium shows diagonal relationship with __________.

Which of the following statement is false?

Give the systematic name for the following.

Milk of magnesia

Describe briefly the biological importance of Calcium and magnesium.

Which would you expect to have a higher melting point, magnesium oxide or magnesium fluoride? Explain your reasoning.

Aerosol cans carry a clear warning of the heating of the can. Why?

Deduce the Vant Hoff equation.

The amount of heat exchanged with the surrounding at constant pressure is given by the quantity

P₁ and P₂ are the vapour pressures of pure liquid components, 1 and 2 respectively of an ideal binary solution If x₁ represents the mole fraction of component 1, the total pressure of the solution formed by 1 and 2 will be

The heat of formation of CO and CO₂ are – 26.4 kCal and – 94 kCal, respectively. Heat of combustion of carbon monoxide will be

C(diamond) → C(graphite), ∆H = –ve, this indicates that

The enthalpies of the formation of Al₂O₃ and Cr₂O₃ are – 1596 kJ and – 1134 kJ, respectively. ∆H for the reaction \[\ce{2Al + Cr2O3 -> 2Cr + Al2O3}\] is

If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

The value of ∆H for cooling 2 moles of an ideal monatomic gas from 125°C to 25°C at constant pressure will be `["given C"_"P" = 5/2"R"]`

Given that \[\ce{C_{(g)} + O2_{(g)} -> CO2_{(g)}}\] ∆H° = – a kJ; \[\ce{2CO_{(g)} + O2_{(g)} -> 2CO2_{(g)}}\] ∆H° = – b kJ; Calculate the ∆H° for the reaction \[\ce{C_{(g)} + 1/2O2_{(g)} -> CO_{(g)}}\]

When 15.68 litres of a gas mixture of methane and propane are fully combusted at 0°C and 1 atmosphere, 32 litres of oxygen at the same temperature and pressure are consumed. The amount of heat released from this combustion in kJ is (∆H_C(CH₄) = – 890 kJ mol⁻¹ and ∆H_C(C₃H₈) = – 2220 kJ mol⁻¹)

Predict the feasibility of a reaction when both ΔH and ΔS positive.

Predict the feasibility of a reaction when both ΔH and ΔS negative.

Predict the feasibility of a reaction when ΔH decreases but ΔS increases.