New chat PYQ Library Doubts Rank report

Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →

Some Basic Concepts of Chemistry question

2023 · 30 Jan · Shift 2 · Q15

Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.

PYQ Library
JEE Main
Chemistry
Some Basic Concepts of Chemistry
2023 · 30 Jan · Shift 2 · Q15

Some Basic Concepts of Chemistry question

2023 · 30 Jan · Shift 2 · Q15

JEE MainChemistrySome Basic Concepts of ChemistryNumerical+4 / −1

The strength of 50 volume solution of hydrogen peroxide is

\underline{\hspace{2cm}}\mathrm{g} / \mathrm{L}

(Nearest integer). Given: Molar mass of

\mathrm{H}_{2} \mathrm{O}_{2}

is

34 \mathrm{~g} \mathrm{~mol}^{-1}

Molar volume of gas at

\mathrm{STP}=22.7 \mathrm{~L}

Numerical answer

View written solutionFree

Correct answer: 150

Meaning of volume strength

A $50$ volume solution of hydrogen peroxide means:

$1\,\text{L}$ of solution gives$ 50,\text{L} $of $$O_2$ at STP.

Decomposition reaction of hydrogen peroxide

$2H_2O_2 \rightarrow 2H_2O + O_2$

From the reaction:

$2 mol $H_2O_2$ produce `$1` mol$ O_2$.

Moles of oxygen produced by 1 L solution

Given molar volume at STP = $$22.7,\text{L mol}^{-1}$

So moles of $O_2$ corresponding to$ 50,\text{L}$ are:

$n(O_2)=\frac{50}{22.7}$

Moles of hydrogen peroxide required

Using stoichiometry:

$n(H_2O_2)=2\times \frac{50}{22.7}=\frac{100}{22.7}$

Mass of hydrogen peroxide in 1 L solution

Molar mass of $$H_2O_2 = 34,\text{g mol}^{-1}$

$\text{Mass} = \frac{100}{22.7}\times 34$

$\text{Mass} \approx 149.78\,\text{g}$

Nearest integer:

$\boxed{150\,\text{g/L}}$

Comparison with stored correct answer

Stored correct answer = $150.

Our derived answer matches the stored answer.

More from Some Basic Concepts of Chemistry

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of $HCl$ of zinc with excess $HCl$ is L (Nearest integer)…2023 · Numerical
On complete combustion, $0.792 g$ of an organic compound gave $CO_{2}$ of $CO_{2}$ . The % of carbon in the organic compound is (Nearest integer)2023 · Numerical
When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of $A$ ?2023 · MCQ
Assume carbon burns according to the following equation : $2 C_{(s)} + O_{2 (g)} \to 2 CO (g)$ when $48 g$ carbon is burnt in $48 g$ of oxygen, the volume of…2023 · Numerical
A sample of a metal oxide has formula $M_{0.83} O_{1.00}$ . The metal $M$ can exist in two oxidation states $+ 2$ and $+ 3$ . In the sample of $M_{0.83} O_{1.00}$ , the percentage of metal ions…2023 · Numerical
If a rocket runs on a fuel ( $C_{15} H_{30}$ ) and liquid oxygen, the weight of oxygen required and $C O_{2}$ released for every litre of fuel respectively are : (Given : density of the fuel is 0.756 g/mL)2022 · MCQ
A 0.166 g sample of an organic compound was digested with conc. $H_{2} S O_{4}$ and then distilled with $N a O H$ . The ammonia gas evolved was passed through 50.0 mL of 0.5 N $H_{2} S O_{4}$ . The used acid required 30.0 mL of 0.25 N $N a O H$ for complete…2022 · Numerical
120 g of an organic compound that contains only carbon and hydrogen gives 330 g of $C O_{2}$ and 270 g of water on complete combustion. The percentage of carbon and hydrogen, respectively are2022 · MCQ