Embibe Experts Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 3: EXERCISE-II (Previous Year Questions)

What volume of oxygen gas $\left({\mathrm{O}}_2\right)$, measured at $0°\mathrm{C}$ and $1 \mathrm{atm}$, is needed to burn $1\mathrm{L}$ of propane gas completely $\left({\mathrm{C}}_3{\mathrm{H}}_8\right)$, measured under the same conditions?

How many moles of lead $\left(\mathrm{II}\right)$ chloride will be formed from a reaction between $6.5 \mathrm{g}$ of $\mathrm{PbO}$ and $3.2 \mathrm{g}$ of $\mathrm{HCl}$? (Atomic weight of $\mathrm{Pb}=207$)

When $22.4 \mathrm{L}$ of ${\mathrm{H}}_2 \left(\mathrm{g}\right)$ is mixed with $11.2 \mathrm{L}$ of ${\mathrm{Cl}}_2 \left(\mathrm{g}\right)$ at $\mathrm{S}.\mathrm{T}.\mathrm{P}.$, the moles of $\mathrm{HCl} \left(\mathrm{g}\right)$ formed are equal to:

$20.0 \mathrm{g}$ of a magnesium carbonate sample decomposes on heating to give carbon dioxide and $8.0 \mathrm{g}$ of magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic Weight: $\mathrm{Mg}=24$)

Suppose the elements $\mathrm{X}$ and $\mathrm{Y}$ combine to form two compounds ${\mathrm{XY}}_2$ and ${\mathrm{X}}_3{\mathrm{Y}}_2$. When $0.1$ mole of ${\mathrm{XY}}_2$ weighs $10 \mathrm{g}$ and $0.05$ mole of ${\mathrm{X}}_3{\mathrm{Y}}_2$ weighs $9 \mathrm{g}$, the atomic weights of $\mathrm{X}$ and $\mathrm{Y}$ are :

$2 \mathrm{g}$ mixture of two divalent metals $\mathrm{A}$ (at $\mathrm{wt}=30$ amu) and $\mathrm{B}$ (at $\mathrm{wt}=15$ amu), on reacting with dilute $\mathrm{HCl}$ solution, gives $2.24$ $\mathrm{L} {\mathrm{H}}_2$ gas at $\mathrm{NTP}$, then composition of $\mathrm{A}$ is (in $\mathrm{g}$):

The heat of combustion of carbon to ${\mathrm{CO}}_2$ is $-393.5 \mathrm{KJ} {\mathrm{mole}}^{-1}$. The heat released upon formation of $35.2 \mathrm{g} {\mathrm{CO}}_2$ from carbon and oxygen gas is _________.

Which of the following is dependent on temperature?