Identify the basic salt from the following salts:

Which one of the following greenhouse gases is a contributor due to incomplete combustion of coal and petroleum?

Which of the following reactions is an endothermic reaction?

(I) The positions of four elements A, B, C and D in the modern periodic table are shown below. Which element is most likely to form an acidic oxide?

Two statements are given- one labeled Assertion (A) and the

other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below

i) Both A and R are true and R is correct explanation of the assertion.

ii) Both A and R are true but R is not the correct explanation of the assertion.

iii) A is true but R is false.

iv) A is false but R is true.

Asswertion (A): Following are the structural isomers of Butane

Reason (R): Structural isomers have the same molecular formula but differ in their structures.