MEDIUM
12th ICSE
IMPORTANT
Earn 100

State the principles which serve as basis for the Magnetic separation in metallurgy.

Important Questions on Sample Question Paper 4

MEDIUM
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 13
State the principles which serve as basis for the refining by liquation in metallurgy.
HARD
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 13
Write the reactions involved in the following process: Refining of zirconium by the van-Arkel method.
EASY
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 14
Explain the following observations: (i) Electrophilic substitution in the case of aromatic amines takes place more readily than benzene.
EASY
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 14

Explain the following observations:

Tertiary amines do not undergo acylation.

EASY
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 15
Calculate the charge in coulombs required for the oxidation of 2 moles of water to oxygen. [Given,1F = 96500 C mol-1  ]
 
HARD
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 15
Zinc or silver-oxide cell is used in hearing aids and electric watches. The following reactions occur:
Zn(s)→Zn2+(ag)+2e-, E° Zn2+/Zn=0.76VAg2O+H2O+2e-→2Ag+2OH-, E° Ag+/Ag=0.34 V
Calculate, (a) the standard potential of the cell. (b) standard Gibbs free energy.    
HARD
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 16

Consider the reaction, A→P. The change in the concentration of A with time is shown in the following plot.

Question Image

Predict the order of reaction.

HARD
12th ICSE
IMPORTANT
All In One ISC Chemistry Class 12>Chapter 19 - Sample Question Paper 4>SAMPLE QUESTION PAPER 4>Q 16
For the reaction, N 2+3H2→2NH3, the rate of change of concentration for hydrogen is 0.3×10-4 Ms-1. What will be the rate of change of concentration of ammonia?