Questions

Except pineapple remaining all three are types of apples.

Pineapple is what kind of apple isn't an apple.

M.F.Hussain

In message passing, it is the condition in which, both, the sender and receiver are blocked until the message is delivered.

Mixtures are combination of two or more substances physically which can be separated in to the original.

Matter can be breakdown into two categories. 

1) Pure substances 

2) Mixtures

Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.

Sonal Mansingh