Q13 of 30 Page 1

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.


Homologous series is a series of compounds with similar chemical properties and same functional group differing from the successive member by CH2 unit. Carbon chains of varying length have been observed in organic compounds having the same general formula.

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11

An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A, the pink colour disappears. The following statement is true for solution 'A' and 'B'.

 12

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)


 14

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.


 15

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.