Lighting a Match With Steam

Zinc on reaction with steam liberates _______ gas.

In the diagram shown in figure ,all pulleys are smooth and massless and stings are light . Match the following

Skeletal muscles fibre has light and dark bands. Which is correct match of protein with its light refractive property and colour

Conversion of water into steam is a ________ change.

Calcium cynamide reacts with steam to form _________ and _______.