Which gas is most abundant in the Earth’s

Select the odd number from the given alternatives:

Statement:

Only a few Gold are Silver

No Gold are Diamond

Conclusion:

I. Some Silver are not Diamond 

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter-cluster that is different.

In each of the following questions, a group of four words / letters /numbers are given. Choose which is odd?

Find the odd one out of the choices given therein.

Four number-pairs are given, three of them are alike in a certain manner and one is different. Choose the different number-pair.

Find the odd one out

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter-cluster that is different. 

In the following question, select the odd number pair from the given alternatives.

Find the one which does not belong to that group?