Embibe Experts Solutions for Exercise 1: SAT 2021

Equal volumes of solutions containing $1$ mole of an acid and $1$ mole of a base respectively are mixed. Which of these mixture will give $\mathrm{pH}$ more than $7$?

You are provided with aqueous solutions of three salts $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. $2‐3$ drops of blue litmus solution, red litmus solution and phenolphthalein were added to each of these solutions in separate experiments. The change in colour of different indicators were recorded in the following table:

On the basis of above observations, identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ from the following options:

If excess of ${\mathrm{CO}}_2$ is passed through the suspension of a compound ‘X’ in water, a compound ‘Y’ is formed. Substances ‘X’ and ‘Y’ dissolve in ${\mathrm{H}}_2{\mathrm{SO}}_4$ giving white compound ‘Z’ which is insoluble in water. Identify the compounds ‘X’, ‘Y’ and ‘Z’.

Sulphur powder is heated on a spatula. A piece of both, moist blue and red litmus papers are brought one by one near the gas evolved during heating. The action of gas on the moist litmus papers will be: