Principles Related to Practical Chemistry

Find the compound 'A' from the following reaction sequences. A aqua-regiaB [(2) AcOH](1) KNO2, NH4OH yellow ppt

1. NiS
2. MnS
3. ZnS
4. CoS

In Carius method of estimation of halogen, 0.25 g of an organic compound gave 0.15 g of silver bromide (AgBr). The percentage of Bromine in the organic compound is 10-1\% (Nearest integer). (Given : Molar mass of Ag is 108 and Br is 80 g mol-1)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

1. Both Statement I and Statement II are false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Statement I is true but Statement II is false

During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is %. (Given molar mass in g mol-1 of Ba : 137, S : 32, O : 16)

Identify A, B and C in the given below reaction sequence [figure]

1. PbCl2, PbSO4, PbCrO4
2. PbS, PbSO4, Pb(CH3COO)2
3. PbS, PbSO4, PbCrO4
4. PbCl2, Pb(SO4)2, PbCrO4

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is %. (Given : molar mass in g mol-1 of Ag:108, Cl:35.5)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are false
2. Statement I is true but Statement II is false
3. Statement I is false but Statement II is true
4. Both Statement I and Statement II are true