Ephemerals are xerophytes that are:

$2, 3$-dimethylhexane contains tertiary,secondary,and primary carbon atoms,respectively:

$A$ coin and a six-faced die, both unbiased, are thrown simultaneously. The probability of getting a head on the coin and an odd number on the die is:

$\cos 36^{\circ} - \cos 72^{\circ}$ is equal to

Exhausted permutit does not contain $.......$ ion.

Copper sulphate dissolves in excess of $KCN$ to give