Embibe Experts Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 4: EXERCISE-4

A mixture of ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$ was heated until all the water was driven-off. If $5.0 \mathrm{g}$ of mixture gave $3 \mathrm{g}$ of anhydrous salts, what was the percentage by mass of ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$ in the original mixture : (H=1,Cu = 63.5, S =32, O=16, Mg=24.3)

A sea water sample has a density of $\frac{1.03 \mathrm{g}}{{\mathrm{cm}}^3}$ and $2.8\%\mathrm{NaCl}$ by mass. A saturated solution of $\mathrm{NaCl}$ in water is $5.45 \mathrm{MNaCl}$. How much water would have to be evaporated from $1.00\times {10}^6 \mathrm{L}$ of the sea water before $\mathrm{NaCl}$ would precipitate?

$20 \mathrm{mL}$ of a mixture of methane and a gaseous compound of Acetylene series were mixed with $100 \mathrm{mL}$ of oxygen and exploded. The volume of the products after cooling to original room temperature and pressure, was $80 \mathrm{mL}$ and on treatment with potash solution a further contracting of $40 \mathrm{mL}$. was observed. Calculate

(a) the molecular formula of the hydrocarbon,

(b) the percentage composition of the mixture.

One type of artificial diamond (commonly called $\mathrm{YAG}$ for yttrium aluminium garnet) can be represented by the formula ${\mathrm{Y}}_3{\mathrm{Al}}_5{\mathrm{O}}_{12}$.

(a) Calculate the weight percentage composition of this compound.

(b) What is the weight of yttrium present in a $200$ - carat $\mathrm{YAG}$ if $1$ carat $-200\mathrm{mg}? \left(\mathrm{Y}=89,\mathrm{Al}=27\right)$

Which of the following statements are not true for hydrogen?

What mass of hydrogen peroxide will be present in $2$ litres of a $5$ molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of $200 \mathrm{mL}$ of this solution.