Principles Related to Practical Chemistry · Question 20

A student has been given 0.314 g of an organic compound and asked to estimate sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of sulphur present in the compound is . (Given molar mass in g mol-1 S : 32, BaSO4 : 233)

1. 63.15%
2. 21.05%
3. 48.24%
4. 42.10%

Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. x, y and z are respectively

1. AgCl, Hg2Cl2 and PbCl2
2. CuCl2, AgCl and PbCl2
3. AlCl3, PbCl2 and BaCl2
4. MgCl2, AgCl and AlCl3

In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is %. (Aqueous tension at 300 K is 15 mm).

In the Group analysis of cations, Ba2+ & Ca2+ are precipitated respectively as

1. sulphide & sulphide
2. hydroxide & carbonate
3. chromate & sulphide
4. carbonate & carbonate

0.25 g of an organic compound "A" containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl2 tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is %. (Nearest integer) (Given: molar mass in g mol-1 H : 1, C : 12, O : 16)

Match List - I with List - II.

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

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

In Carius method 0.2425 g of an organic compound gave 0.5253 g silver chloride. The percentage of chlorine in the organic compound is

1. 87.65%
2. 53.58%
3. 37.57%
4. 34.79%

Sodium fusion extract of an organic compound (Y) with CHCl3 and chlorine water gives violet color to the CHCl3 layer. 0.15 g of (Y) gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound (Y) is . (Nearest integer) (Given : molar mass g mol-1 C : 12, H : 1, Cl : 35.5, Br : 80, I : 127)

Identify the correct statements : Choose the correct answer from the options given below :

1. D and E Only
2. A, B and E Only
3. A, B, C and E Only
4. A, B and C Only