A carbon compound P on heating with excess conc. `H_2SO_4` forms another carbon compound Q which on addition of hydrogen in the presence of nickel catalyst forms a saturated compound R. One mole of 'R' on combustion forms two molecules of carbon dioxide and three molecules of water. identify P,Q and R and write the chemical equations for the reactions involved.

Ethane (C_2H_6) burns in oxygen to form carbon dioxide and water. Write balanced chemical equation for this reaction.

A mixed oxide of iron and chromium, FeO.Cr_2O_3 is fused with sodium carbonate in the presence of air to form a yellow compound (A). On acidification, the compound (A) forms an orange coloured compound (B) which is a strong oxidising agent. Identify write balanced chemical equations for each step.

In one of the industrial processes used for manufacture of sodium hydroxide, a gas ‘X’ is formed as a by-product. The gas ‘X’ reacts with lime water to give a compound ‘Y’ which is used as a bleaching agent in the chemical industry. Identify ‘X’ and ‘Y’ giving the chemical equations of the reactions involved.

A water soluble compound 'X' of sodium on reacting with dil. H_2SO_4 released a colourless gas accompanied by brisk effervescence. When the gas was passed through water, the solution obtained turned blue litmus solution red. On bubling the gas through lime water, it initially became milky and the milkness disappeared when the gas was passed in excess. Identify the substance 'X' and write the chemical equation for the reactions involved.

A mixed oxide of iron and chromium, FeO.Cr_2O_3 is fused with sodium carbonate in the presence of air to form a yellow compound (A). On acidification, the compound (A) forms an orange coloured compound (B) which is a strong oxidising agent. Identify the compounds (A) and (B) .

Write the balanced chemical equations for the following reaction in each case. Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.

Write the balanced chemical equations fo rthe following reactions and identify the type of reaction in each case. Ethonol is burnt in air to form carbon dioxide water and release heat.

When a mixture of ammonium chloride and potassium dichromate are heated, a stable colourless gas (A) was evolved which did not support combustion but magnesium continued to burn in it. The gas (A) reacted with calcium carbide in an electric furnance forming a solid (B). The compound (B) was slowly hydrolysed by water forming an insoluble substance (C) and the solution of substance (D) which turned Nessler’s reagent brown. Identify (A) to (E) and give the reactions involved.

A dihalogen derivative (A) of a hydrocarbon having two carbon atoms reacts with alcoholic potash and forms another hydrocarbon which gives a red precipitate with ammoniacal solution of cuprous chloride. Compound ‘A' gives an aldehyde when treated with aqueous KOH. Write down the name and formula of the compound.