Q12 of 30 Page 1

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)


(D) The non-metal forms acidic oxide and they are placed in the group 16.


OR


(d) Aluminium is the element that is atomic number 13 on the periodic table.


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In which of the following, the identity of initial substance remains unchanged?

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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'.

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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.


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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.