When water is dropped on calcium carbide, the gaseous product is an

• A. alkane
• B. alkene
• C. alkyne
• D. alkanol

What is the pH of 0.001 mol dm³ solution of sodium hydroxide?

• A) 14
• B) 13
• C) 12
• D) 11

The process or act of extracting a metal from its ore and refining it is called?

• A. Extraction
• B. Metal mining
• C. Mettallurgy
• D. Prospecting

The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO3 is?

• A. hydroxyl group
• B. carboalkoxyl group
• C. carbonyl group
• D. carboxyl group

I. It has a varied composition from one place to another. II. It constituents can be separated by physical means. III. It contains unreactive noble gases Which of the above shows that air is a mixture?

• A) I and II only
• B) II and III only
• C) I and III only
• D) I, II and III

Atoms are electrically neutral because they

• A. do not conduct electricity
• B. contain equal number of protons and electrons
• C. are composed of neutrons and electrons
• D. cannot be attracted by electromagnetic field.

In the Haber process for the manufacture of ammonia, finely divided iron is used as

• A) an ionizing agent
• B) a reducing agent
• C) a catalyst
• D) a dehydrating agent

If the solubility of KHCO₃ is 0.40 mole/dm³ at room temperature , calculate the mass of KHCO₃ in 100dm³ of the solution at this temperature. [KHCO₃ = 100hmol]

• A. 4.0g
• B. 10.0g
• C. 40.0g
• D. 100.0g

The pair of organic compounds that are isomers is

• A. Benzene and methylbenzene
• B. Trichloromethane and tetrachloromethane
• C. Ethanol and propane
• D. But-1-ene and but-2-ene

Which of the following molecules has a linear shape?

• A. CH₄
• B. CO₂
• C. H₂S
• D. NH₃