Which of the following reacts with hydrochloric acid to give hydrogen as a product?

Which of the following causes acid rain?

Which of the following noble gases do not occur in the elemental state in the atmosphere?

What is the basicity of pyrophosphoric acid?

What are pyrites known as fool’s good?

Which group does the name ‘pnictogens’ refer to?

Which is the most abundant group 16 element?

Which of the following gas is used as Holmes signal?