Q3 of 30 Page 1

How are covalent bonds formed?

Covalent bond s are formed when two or more atoms share electrons, that is when electrons are actually shared equally between he atoms.


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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.


 2

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.


 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