Which of the following chlorides is covalent and soluble in ether?

Which of the following hormone levels causes the release of an ovum from the Graafian follicle (ovulation)?

$A$ student is to answer $10$ out of $13$ questions in an examination such that he must choose at least $4$ from the first $5$ questions. The number of choices available to him is

Suppose the gravitational force varies inversely as the $n^{th}$ power of distance. Then the time period of a planet in circular orbit of radius $R$ around the sun will be proportional to

The yellow colour solution of $Na_2CrO_4$ changes to orange-red on passing $CO_2$ gas due to the formation of

Which of the following ions can cause coagulation of proteins?