Chemistry
State which type of chemical reactions proceed with -
(a) Evolution of heat energy
(b) Absorption of heat energy.
State in each of the following reactions whether heat is evolved or absorbed
(i) water is added to quicklime
(ii) two neutral gases on passage through an electric arc give nitric oxide
(iii) two neutral gases combine to give - a basic gas.
Related Questions
State what is meant by 'reactivity series of metals'. With reference to -
(a) Water
(b) Acids
explain with suitable examples how the reactivity of the metals could be differentiated.
A chemical reaction may be 'reversible' in nature. State the meaning of the term in italics. Give a reason why a catalyst is used in certain chemical reactions.
Give a balanced equation for the following -
(a) A reversible catalytic reaction involving -
(i) nitrogen as one of the reactants
(ii) sulphur dioxide as one of the reactants.
Certain thermal decomposition reactions, result in formation of oxides. Give balanced equations for the thermal decomposition of the following, which result in formation of a metallic oxide.
(a) Limestone
(b) Lead carbonate
(c) Calcium nitrate
(d) Calcium hydroxide.
State the meaning of the term 'oxide. Give a balanced equation for formation of the following oxides -
(a) Sulphur dioxide from a non-metal
(b) Zinc oxide from a metal
(c) Lead oxide from a mixed oxide.