CBSE Class 12 English Core Compartment Question Paper 2023 with Answer Key (Set 3 - 1/C/3)

CBSE CLASS XII Questions

• 1.

  61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.

  View Solution

  ---

• 2.

  For decomposition of $H_2O_2$ by $I^-$: Step I: $H_2O_2 + I^- \rightarrow H_2O + IO^-$ (slow). Step II: $H_2O_2 + IO^- \rightarrow H_2O + I^- + O_2$ (fast). (a) Write rate law. (b) Determine order w.r.t. $H_2O_2$ and $I^-$ and overall order. (c) Molecularity of Step II.

  View Solution

  ---

• 3.

  Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C

  View Solution

  ---

• 4.

  Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

  View Solution

  ---

• 5.

  Why are magnesium blocks attached to iron water pipelines?

  View Solution

  ---

• 6.

  Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

  View Solution