Which of the following is an amorphous allotrope of carbon?

Talcum powder has a slippery touch.

Which of the following compound is formed when aluminium reacts with an alkali?

Inert pair affect ______ down the group.

Why hydrides of Germanium are known as _________

Which of the following is true regarding the acidic character?

What is the second hardest material known?

Which of the following is not a use of orthoboric acid?