Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions

Classify the following oxide as neutral, acidic, basic or amphoteric:

SiO₂

Classify the following oxide as neutral, acidic, basic or amphoteric:

CO₂

Classify the following oxide as neutral, acidic, basic or amphoteric:

Al₂O₃

Classify the following oxide as neutral, acidic, basic or amphoteric:

PbO₂

Classify the following oxide as neutral, acidic, basic or amphoteric:

Tl₂O₃

Write suitable chemical equations to show the nature of the following oxide.

B₂O₃

Write suitable chemical equations to show the nature of the following oxide.

SiO₂

Write suitable chemical equations to show the nature of the following oxide.

CO₂

Write suitable chemical equations to show the nature of the following oxide.

Al₂O₃

Write suitable chemical equations to show the nature of the following oxide.

PbO₂

Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

The pressure-volume work for an ideal gas can be calculated by using the expression w = `- int_(v_i)^(v_f) p_(ex)  dV`. The work can also be calculated from the pV– plot by using the area under the curve within the specified limits. When an ideal gas is compressed (a) reversibly or (b) irreversibly from volume V_i to V_f. choose the correct option.

For an ideal gas, the work of reversible expansion under isothermal condition can be calculated by using the expression w = `- nRT` In `V_f/V_i`. A sample containing 1.0 mol of an ideal gas is expanded isothermally and reversibly to ten times of its original volume, in two separate experiments. The expansion is carried out at 300 K and at 600 K respectively.

(i) Work done at 600 K is 20 times the work done at 300 K.

(ii) Work done at 300 K is twice the work done at 600 K.

(iii) Work done at 600 K is twice the work done at 300 K.

(iv) ∆U = 0 in both cases.

A sample of 1.0 mol of a monoatomic ideal gas is taken through a cyclic process of expansion and compression as shown in figure 6.1. What will be the value of ∆H for the cycle as a whole?

Expansion of a gas in vacuum is called free expansion. Calculate the work done and the change in internal energy when 1 litre of ideal gas expands isothermally into vacuum until its total volume is 5 litre?

What will be the work done on an ideal gas enclosed in a cylinder, when it is compressed by a constant external pressure, p_ext in a single step as shown in figure. Explain graphically.

How will you calculate work done on an ideal gas in a compression, when change in pressure is carried out in infinite steps?

Represent the potential energy/enthalpy change in the following processes graphically.

(a) Throwing a stone from the ground to roof.

(b) \[\ce{1/2 H2(g) + 1/2 Cl2 (g) ⇌ HCl (g) Δ_rH^Θ = - 92.32 kJ mol^{-1}}\]

In which of the processes potential energy/enthalpy change is contributing factor to the spontaneity?

1.0 mol of a monoatomic ideal gas is expanded from state (1) to state (2) as shown in figure. Calculate the work done for the expansion of gas from state (1) to state (2) at 298 K.