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

What effect does branching of an alkane chain has on its boiling point?

K_p = 0.04 atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of C₂H₆ when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium?

\[\ce{C2H6 (g) ⇌ C2H4 (g) + H2 (g)}\]

Describe two important uses of the following quicklime.

Describe the importance of the limestone.

Describe the importance of the cement.

Describe the importance of the plaster of paris.

What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?

\[\begin{array}{cc}
\ce{D}\phantom{......}\ce{H}\\
\backslash\phantom{......}/\\
\ce{C = C}\\
\phantom{...}/\phantom{......}\backslash\phantom{...}\\\ce{H}\phantom{.......}\ce{D}
\end{array}\]

\[\begin{array}{cc}
\ce{D}\phantom{......}\ce{D}\\
\backslash\phantom{......}/\\
\ce{C = C}\\
\phantom{...}/\phantom{......}\backslash\phantom{...}\\\ce{H}\phantom{.......}\ce{H}\end{array}\]

Calculate a) ΔG°and b) the equilibrium constant for the formation of NO₂ from NO and O₂ at 298 K

\[\ce{NO(g) + 1/2 O_2 (g) <=> NO_2(g)}\]

where Δ_fG^⊝ (NO₂) = 52.0 kJ/mol

Δ_fG^⊝ (NO) = 87.0 kJ/mol

Δ_fG^⊝ (O₂) = 0 kJ/mol

Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?

\[\ce{3Fe (s) + 4H2O (g) ⇌ Fe3O4 (s) + 4H2 (g)}\]

Compare the structures of H₂O and H₂O₂.

Predict which of the following reaction will have the appreciable concentration of reactants and products:

1. \[\ce{Cl2 (g) ⇌ 2Cl (g)}\] K_c = 5 ×10^–39
2. \[\ce{Cl2 (g) + 2NO (g) ⇌ 2NOCl (g)}\] K_c = 3.7 × 10⁸
3. \[\ce{Cl2 (g) + 2NO2 (g) ⇌ 2NO2Cl (g)}\] K_c = 1.8

The value of K_c for the reaction 3O₂ (g) ↔ 2O₃ (g) is 2.0 ×10^–50 at 25°C. If the equilibrium concentration of O₂ in the air at 25°C is 1.6 ×10^–2, what is the concentration of O₃?

The reaction, \[\ce{CO(g) + 3H2(g) ↔ CH4(g) + H2O(g)}\] is at equilibrium at 1300 K in a 1L flask. It also contains 0.30 mol of CO, 0.10 mol of H₂ and 0.02 mol of H₂O and an unknown amount of CH₄ in the flask. Determine the concentration of CH₄ in the mixture. The equilibrium constant, K_c for the reaction at the given temperature is 3.90.

What is green chemistry?

What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?

What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?

\[\begin{array}{cc}\ce{^+OH}\\||\\
\ce{H - C - OH}\end{array}\]

\[\begin{array}{cc}\ce{OH}\phantom{.}\\|\phantom{...}\\
\ce{H - C^+ - OH}\end{array}\]

Which of the following statements is correct about the reaction given below:

\[\ce{4Fe(s) + 3O2(g) -> 2Fe2O3(g)}\]

Which of the following reactions is not correct according to the law of conservation of mass.

Which of the following is not an actinoid?

The electronic configuration of gadolinium (Atomic number 64) is ______.