What is the characteristic of the gas liberated when dilute hydrochloric acid is added to Iron(ii)sulphide?

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound?

[ H = 1.0. C = 12.0, O = 16.0 ]

When excess chlorine is mixed with ethane at room temperature, the product formed is?

Which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol ?

If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the?