Write the name and formula of the 2nd member of homologous series having general formula C_nH_2n.

On adding acetic acid to sodium hydrogen carbonate in a test tube, a student observes.

• no reaction

• a colourless gas with pungent

• bubbles of a colourless and odourless gas

• bubbles of a colourless and odourless gas

• Mustard oil and calcium hydroxide

• Castor oil and calcium hydroxide

• Turpentine oil and sodium hydroxide

• Turpentine oil and sodium hydroxide

A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na₂SO₄ in P, K₂SO₄ in Q, CaSO₄ in R and MgSO₄ in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes,

• P and Q

• P and R

• P, Q and S

• P, Q and S

On adding  2mL acetic acid to 2mL of water in a test tube, it was observed that

• a clear and transparent solution is formed.

• a white precipitate is formed almost immediately.

• two separate layers were formed.

• two separate layers were formed.