NCERT Solutions for Chapter: The s-Block Elements, Exercise 1: Multiple Choice Questions (Type-I)

Dead burnt plaster is

Suspension of slaked lime in water is known as 

Which of the following elements does not form hydride by direct heating with dihydrogen? 

The formula of soda ash is

A substance which gives brick-red flame and breaks down on heating to give oxygen and a brown gas is 

Which of the following statements is true about $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$$?$

A chemical $\mathrm{A}$ is used for the preparation of washing soda to recover ammonia. When ${\mathrm{CO}}_2$ is bubbled through an aqueous solution of $\mathrm{A}$, the solution turns milky. It is used in white washing due to its disinfectant nature. What is the chemical formula of $\mathrm{A}$? 

Dehydration of hydrates of halides of calcium, barium, and strontium i.e., ${\mathrm{CaCl}}_2·6{\mathrm{H}}_2\mathrm{O}, {\mathrm{BaCl}}_2·2{\mathrm{H}}_2\mathrm{O}, {\mathrm{SrCl}}_2·2{\mathrm{H}}_2\mathrm{O},$ can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?