Which of the following allotropes of carbon are hard in nature?

Which of the following elements do you think can react with water?

Which of the following is not a component of glass?

Is catenation possible in carbon?

Which of the following is not a property of carbon monoxide?

The ionization enthalpy _____ down the group in the family.

Which of the following is a colourless gas?

What is the colour of silicon?