The most dangerous method of preparing hydrogen would be by the action of $HCl$ and

Which is an example of a molecular hydride?

Which of the following statements about $H_2SO_4$ is incorrect?

Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors,which one is most important in this respect?

What do you expect the nature of hydrides is,if formed by elements of atomic numbers $15, 19, 23$ and $44$ with dihydrogen? Compare their behaviour towards water.

When sugar is brought into contact with concentrated $H_2SO_4$,it turns black due to .......