Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.

Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.

Calculate the half-life of a first order reaction from the rate constant given below:

2 min⁻¹

Calculate the half-life of a first order reaction from the rate constant given below:

4 year⁻¹

A first order reaction takes 40 min for 30% decomposition. Calculate `"t"_(1/2)`.

Write the Nernst equation and emf of the following cell at 298 K:

Fe_(s) | Fe²⁺ (0.001 M) || H⁺ (1 M) | H_2(g) (1 bar) | Pt_(s)

Write the Nernst equation and emf of the following cell at 298 K:

\[\ce{Sn_{(s)} | Sn^{2+} (0.050 M) || H^+ (0.020 M) | H2_{(g)} (1 bar) | Pt_{(s)}}\]

Write the Nernst equation and emf of the following cell at 298 K:

Pt_(s) | Br⁻ (0.010 M) | Br_2(l) || H⁺ (0.030 M) | H_2(g) (1 bar) | Pt_(s)

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with SO₂? Write the ionic equation for the reaction.

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with oxalic acid? Write the ionic equation for the reaction.

Using IUPAC norms, write the formula for the following:

Hexaammineplatinum(IV)

Using IUPAC norms, write the formula for the following:

Pentaamminenitrito-N-cobalt(III)

Write a short note on the following:

Ammonolysis

How the following conversion can be carried out?

tert-Butyl bromide to isobutyl bromide

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields three isomeric monochlorides.

Among the isomeric alkanes of molecular formula C₅H₁₂, identify the one that on photochemical chlorination yields four isomeric monochlorides.

Indicate the steps in the preparation of \[\ce{K2Cr2O7}\] from chromite ore.

How are the following conversion carried out?

\[\ce{Methyl magnesium bromide -> 2-Methylpropan-2-ol}\]

Define lanthanoid contraction.

How many atoms constitute one unit cell of a face-centered cubic crystal?