Some Basic Concepts of Chemistry

If 0.189 g of a chlorine containing organic compound gave 0.287 g of silver chloride, then the percentage of chlorine in the organic compound is

• 35.47

• 35.57

• 37.57

• 45.37

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0M HNO₃ ? The concentrated acid is 70% HNO₃.

• 45.0 g conc. HNO₃

• 90.0 g con. HNO₃

• 70.0 g conc. HNO₃

• 54.0 g conc. HNO₃

The system that contains the maximum number of atoms is

• 4.25 g of NH₃

• 8 g of O₂

• 2 g of H₂

• 4 g of He

The weight of oxalic acid that will be required to prepare a 1000 ml (N/20) solution is:

• 126/100 g

• 63/40 g

• 63/20 g

• 126/20 g

In 'x' mL 0.3 N HCl, the addition of 200 mL distilled water or addition of 100 mL 0.1 N NaOH, gives the same final acid strength. Determine 'x'.

Compound A treated with NaNH₂ followed by CH₃CH₂Br gave compound B. Partial hydrogenation of compound B produced compound C, which on ozonolysis gave a carbonyl compound D, (C₂H₅O). Compound D did not respond to the iodoform test with I₂/KI and NaOH. Find out the structures of A, B, C and D.

The volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is

• 1.15 cc

• 2 cc

• 2.15 cc

• 2.30 cc

2 g of metal carbonate is neutralised completely by 100 mL of 0.1 N HCI. The equivalent weight of metal carbonate is:

• 50

• 100

• 150

• 200

An excess of AgNO₃ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitate would be

• 0.001

• 0.002

• 0.003

• 0.01

6.02 x 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of solution is

• 0.02 M

• 0.01 M

• 0.001 M

• 0.1 M