Principles Related to Practical Chemistry

In Kjeldahl's method for estimation of nitrogen, CuSO4 acts as :

1. catalytic agent
2. hydrolysis agent
3. reducing agent
4. oxidising agent

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

1. Both Statement I and Statement II are correct
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect

The number of white coloured salts, among the following is (a) SrSO4 (b) Mg(NH4)PO4 (c) BaCrO4 (d) Mn(OH)2 (e) PbSO4 (f) PbCrO4 (g) AgBr (h) PbI2 (i) CaC2O4 (j) [Fe(OH)2(CH3COO)]

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

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

Lassaigne's test is used for detection of :

1. Phosphorous and halogens only
2. Nitrogen, Sulphur and Phosphorous only
3. Nitrogen, Sulphur, phosphorous and halogens
4. Nitrogen and Sulphur only

Following Kjeldahl's method, 1 g of organic compound released ammonia, that neutralised 10 mL of 2 M H2SO4. The percentage of nitrogen in the compound is %.

The compound that is white in color is

1. ammonium sulphide
2. ammonium arsenomolybdate
3. lead iodide
4. lead sulphate

Match List I with List II

1. A-I, B-II, C-IV, D-III
2. A-II, B-III, C-I, D-IV
3. A-IV, B-I, C-II, D-III
4. A-IV, B-III, C-II, D-I

'Adsorption' principle is used for which of the following purification method?

1. Chromatography
2. Sublimation
3. Distillation
4. Extraction

Molar mass of the salt from NaBr, NaNO3, KI and CaF2 which does not evolve coloured vapours on heating with concentrated H2SO4 is g mol-1. (Molar mass in g mol-1 : Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)