Q2 of 30 Page 1

Assertion (A) : Alloy s 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.


Alloys always show high resistivity than pure original metal but have relatively low melting point; therefore, not ideal for the use in heating device such as iron or immersion rod.

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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-unitis called a homologous series.


 3

How are covalent bonds formed?

 4

Define electro positivity.

OR


The atomic radil of first group elements are given below:



State the reason behind the observed trend in the above elements.


 5

A cylindrical conductor of length ‘l’ and uniform are a of cross section 'A' has resistance 'R'. The are a of cross section of another conductor of same material and same resistance but of length '2l’ is