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The Prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of-

In Kjeldahl's method of estimation of nitrogen, K₂SO₄ acts as-

Soda extract is prepared by-
1. Fusing soda and mixture of hydrocarbons, and then extracted with water
2. Dissolving NaHCO₃ and mixture of hydrocarbons in dil. HCl
3. Boiling Na₂CO₃ and mixture of hydrocarbons in dil. HCl
4. Boiling Na₂CO₃ and mixture of hydrocarbons in distilled water

A compound that does not give a positive test in Lassaigne’s test for nitrogen is:
1. Urea
2. Hydrazine
3. Azobenzene
4. Phenylhydrazine

In Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M $H_{2}S{O}_4$. The percentage of nitrogen in the soil is:
(1) 37.33
(2) 45.33
(3) 35.33
(4) 43.33

Ether and benzene can be separated by :-
(1) Filtration
(2) Distillation
(3) Crystallization
(4) Sublimation

The colour of the solution that gets formed by mixing sodium nitroprusside to an alkaline solution of sulfide ions, is-

A strong base can abstract an $\mathrm{\alpha }$-hydrogen from
1. alkene
2.amine
3. ketone
4. alkane

In Duma's method of estimation of nitrogen, 0.35 g of an organic compound gave 55 ml of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be-
(Aqueous tension at 300 K = 15 mm)
1. 16.45
2. 17.45
3. 14.45
4. 15.45

Buta-1,3-diene and But-2-yne are:
1. Position isomers
2. Functional isomers
3. Chain isomers
4. Tautomers

The least stable resonance structure among the following is:
1. 
2. 
3. 
4. 

0.26 g of an organic compound gave 0.039 g of water and 0.245 g of carbon dioxide on combustion. The percentage of C in the organic compound is-
1. 35%
2. 25%
3. 2%
4. 90%

In an estimation of sulphur by the carius method, 0.2175 g of the substance gave 0.5825 g of BaSO₄ . The percentage composition of S in the compound is-
1. 66%
2. 20%
3. 37%
4.82%

0.284 g of an organic substance gave 0.287 g AgCl in a carius method for the estimation of halogen. The percentage of Cl in the compound is-
1. 5%
2. 18%
3. 25%
4. 33%

0.24 g of an organic compound containing phosphorous gave 0.66 g of Mg₂P₂O₇ by the usual analysis. The percentage of phosphorous in the compound is-
1. 77%
2. 72%
3. 87%
4. 60 %

0.1688 g organic compound when analyzed by the Dumas method yields 31.7 mL of moist nitrogen measured at 14º C, and 758 mm mercury pressure. The % of nitrogen in the organic compound (Aqueous tension at 14 º C =12 mm) is-
1. 30.9%
2. 10%
3. 40%
4. 21.9 %

0.6 g of an organic compound was Kjeldahlised and NH₃ evolved was absorbed into 50 mL of semi-normal solution of H₂SO₄. The residual acid solution was diluted with distilled water and the volume made up to 150 mL. 20 mL of this diluted solution required 35 mL of N/20 NaOH solution for complete neutralization.
1. 24.2% 
2. 32.4%
3.27.6 %
4. 20.8%