Tetraammine copper (II) sulphate dissolves in ammonia solution to give which colour?

1. Greeen
2. Pink
3. Blue
4. Yellow

An element X belongs to group II A and another element Y belongs to group V A of the periodic table. Which of the following could be correct?

P. Valency of Y will be 5.

Q. Element X will have 2 valence electrons.

R. Element X belongs to group number 2

1. Only P
2. Q
3. R
4. Both Q and R

The organic compound which undergoes substitution reaction is

1. C₂H₂
2. C₄H₈
3. C₈H₁₄
4. C₅H₁₂

An anode used during the extraction of aluminium is

1. platinum rods
2. carbon rods
3. zinc sulphate
4. copper sulphate