List of top Science Questions on Hydrocarbons asked in CBSE Compartment X

When two compounds — sodium chloride and calcium chloride — are burned in a flame one by one, the flame turns into different colours.
(i) Write the name of the flame colours produced by:
Sodium chloride
Calcium chloride
(ii) Are these compounds soluble in non-polar solvents like kerosene or petrol? Justify your answer.

Select the hydrocarbon from the following which contains one C$\equiv$C triple bond and one C–C single bond:

(i) Why do the members of a homologous series show similar chemical properties?
(ii) What is the difference in number of carbon and hydrogen atoms between two consecutive members of a homologous series?
Give one example each of (i) Alkanes, (ii) Alcohols, (iii) Aldehydes.

(i) Explain why carbon forms strong bonds with other elements.
(ii) Why do covalent compounds have low melting and boiling points?
(iii) Draw electron dot structure of chlorine (atomic number 17).

A metal 'A' reacts violently with cold water and the released gas catches fire. Another metal 'B' floats on water and moves rapidly on the surface. Metal 'C' does not react with cold or hot water but reacts with steam. Metal 'D' does not react with water in any form. Identify metals 'A', 'B', 'C', and 'D'.