Carbon and its Compounds — Science STD 10 — Question

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

Explain the meaning of saturated and unsaturated hydrocarbons with two examples each.

Give two general properties of ionic compounds and two those of covalent compounds.

A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M and black coloured product and also explain the reaction of M with oxygen.

Graphite is a covalent molecule but a good conductor of electricity. Why?

State a difference between a mineral an ore?

An element X is in group 2 of the periodic table:

1. What will be the formula of its chloride?
2. What will be the formula of its oxide?

What is bleaching powder? How is bleaching powder prepared? Write chemical equation of the reaction involved in the preparation of bleaching powder.

Give any two differences between soaps and detergents.

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.
F, Na, Mg, Al, Si, P, S, Cl, Ar, K.

1. Pick two sets of elements which have similar properties.
2. The given sequence represents which law of classification of elements?