Chemistry
State one relevant observation for each of the following:
(a) To the copper nitrate solution, initially few drops of sodium hydroxide solution is added and then added in excess.
(b) Burning of ammonia in excess of oxygen.
(c) Dry ammonia gas is passed over heated PbO.
Answer
(a) When a few drops of sodium hydroxide solution are added to the copper nitrate solution, light blue coloured ppt. of Cu(OH)2 is obtained which is insoluble with excess NaOH.
(b) Ammonia burns in the atmosphere of excess oxygen with a greenish yellow flame, forming nitrogen and water vapour.
(c) Buff yellow PbO is reduced to greyish metallic lead.
Related Questions
The Empirical formula of an organic compound is CHCl2.
If its relative molecular mass is 168, what is its molecular formula?
[At. Wt. C = 12, H = 1, Cl = 35.5]
Choose the substances given in the box below to answer the following questions:
Iron Magnesium sulphite Zinc Sodium sulphide Lead Ferric chloride Copper Ferrous sulphate (a) The metal that will not produce hydrogen gas when reacted with dilute acids.
(b) The compound that will produce sulphur dioxide gas when reacted with dilute HCl.
(c) The solution of this compound produces dirty green precipitate with NaOH.
Name the following:
(a) Organic compounds with same molecular formula but different structural formula.
(b) Group of organic compounds where the successive members follow a regular structural pattern, successive compounds differ by a 'CH2' group.
Give reason for the following:
(a) Ionisation potential decreases down a group.
(b) Ionic compounds do not conduct electricity in solid state.