Chemistry
Give reasons:
(a) Ethene undergoes addition reaction.
(b) Hydrocarbons can be used as fuels.
(c) Hydrogen chloride gas cannot be collected over water.
Answer
(a) In case of ethene, the valencies of atleast 2 carbon atoms are not fully satisfied by hydrogen atoms. The availability of electrons in the double bond makes them more reactive and hence they undergo addition reactions only.
(b) Hydrocarbons are highly combustible and they produce good amount of heat hence they are used as a fuel.
(c) Hydrogen chloride gas is not collected over water since it is highly soluble in water.
Related Questions
Name the alloy which is made up of:
(a) Copper, Zinc and Tin
(b) Lead and Tin
Seema takes a blue crystalline salt P in a test tube. On heating it produces a white anhydrous powder. P is dissolved in water. Zinc is added to one part of the solution and to another part of the solution Barium chloride is added.
(a) Name the compound P.
(b) Mention one observation when zinc is added to the solution of P.
(c) State the colour of the precipitate formed when barium chloride is added to the solution of P.
Name the following:
(a) The ore of Zinc containing its sulphide.
(b) The most commonly used oxide ore of Aluminium.
State one observation in the following cases:
(a) Sodium chloride solution is added to a solution of lead nitrate.
(b) Barium chloride solution is added to a solution of Zinc sulphate.