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

For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

 A first order reaction takes 40 minutes for 30% decomposition. Calculate t_1/2 for this reaction. (Given log 1.428 = 0.1548)

Write the fomulae of the following compounds

Sodium hexanitrito- N - cobaltate (III)

Write the chemical equation involved in the following reaction:

Hoffmann-bromamide degradation reaction

Write the structures of A and B in the following reactions:

Complete the following equations:

Complete the following equations: Cr₂O₇^2- + 14H⁺ + 6I →

Using IUPAC norms, write the formula for the following: 

Potassium tetracyanidonickelate(II)

Name the reagents used in the following reactions:

Complete the following equation:

\[\ce{2MnO4- + 6H+ + 5NO2- ->}\]

Illustrate the following reaction giving suitable example in each case:Gabriel phthalimide synthesis

A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.

(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

When chromite ore FeCr₂O₄ is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).

(i) Write the formulae of the compounds (A), (B) and C.

(ii) Write one use of compound (C).

Complete the following chemical equation

8MnO₄^- + 3S₂O₃^2- + H₂O →

Write the main product(s) in each of the following reactions:

Write the formula for the following complex:

Pentaamminenitrito-O-Cobalt(III)

Name the reagents used in the following reactions:

Complete the following equation :

`2MnO_4^(-)+6H^++5NO_2^(-)rarr`

How do you convert the following : Propan-2-ol to 2-methylpropan-2-ol

An aromatic compound 'A' of molecular formula C₇H₇ON undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions :