State one appropriate observation for each of the following:
Copper sulphide is treated with dilute hydrochloric acid.
Choose the most appropriate answer from the following option:
Among the period 2 elements, the element which has high electron affinity.
Lithium
Carbon
Chlorine
Chlorine
Give suitable chemical term for the following:
A reaction in which hydrogen of an alkene is replaced by a halogen.
Give suitable chemical terms for the following:
A definite number of water molecules bound to some salts.
Give a chemical test to distinguish between the following pair of the compound;
zinc nitrate and calcium nitrate
Give suitable chemical terms for the following:
The process in which a substance absorbs moisture from the atmospheric air to become moist, and ultimately dissolves in the absorbed water.
Identify the gas evolved in the following reaction when:
Concentrated hydrochloric acid is made to react with manganese dioxide.
Give suitable chemical terms for the following:
A salt formed by incomplete neutralisation of an acid by a base.
Choose the most appropriate answer from the following option:
Among the following compounds identify the compound that has all three bonds (ionic, covalent and coordinate bond).
Ammonia
Ammonium chloride
Sodium hydroxide
Sodium hydroxide
