Assertion (A): Alloys are commonly used in electrical heating devices like electric iron and heater.

Reason (R): Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.

An element ‘X’ is forming an acidic oxide. Its position in modern periodic table will be

A. Group 1 and Period 3 B. Group 2 and Period 3

C. Group 13 and Period 8 D. Group 16 and Period 3

OR

Consider the following statements about an element ‘X’ with number of protons 13.

(A) It forms amphoteric oxide

(B) Its valency is three

(C) The formula of its chloride in XCl₃

The correct statements(a) is/are

A. only (A) B. only (B)

C. (A) and (c) D. (A), (B) and (C)

Assertion (A): Following are the members of a homologous series:

CH₃OH, CH₃CH₂OH, CH₃CH₂CH₂OH

Reason (R): A series of compounds with same functional group but differing by -CH₂- unit is called a homologous series.

Mention with reason the colour change observed when:

(i) silver chloride is exposed to sunlight.

(ii) copper powder is strongly heated in the presence of oxygen

(iii) a piece of zinc is dropped in copper sulphate solution.

Complete and balance the following chemical equations:

(i) NaOH_(aq) + Zn_(s)→

(ii) CaCO_3(s) + H₂O_(l) + CO_2(g)→

(iii) HCl_(aq) + H₂O_(l)→

OR

During electrolysis of brine, a gas ‘G’ is liberated at anode. When this gas ‘G’ is passed through slaked lime, a compound ‘C’ is formed, which is used for disinfecting drinking water.

(i) Write formula of ‘G’ and ‘C’.

(ii) State the chemical equation involved.

(iii) What is common name of compound ‘C’? Give its chemical name.