MHT CET · Chemistry · Redox Reactions
What is the mass of \(\mathrm{KClO}_{3(\mathrm{~s})}\) required to liberate 22. \(4 \mathrm{dm}^3\) oxygen at STP during thermal decomposition? (Molar Mass of \(\mathrm{KClO}_{3(\mathrm{~s})}=122.5 \mathrm{~g} / \mathrm{mol}\) )
- A \(122.5 \mathrm{~g}\)
- B \(81.67 \mathrm{~g}\)
- C \(10.25 \mathrm{~g}\)
- D \(8.16 \mathrm{~g}\)
Answer & Solution
Correct Answer
(B) \(81.67 \mathrm{~g}\)
Step-by-step Solution
Detailed explanation
\(
\begin{aligned}
& 2 \mathrm{KClO}_3 \\
& {[2 \mathrm{moles}]}
\end{aligned} \longrightarrow 2 \mathrm{KCl}+\underset{[3 \mathrm{moles}]}{3 \mathrm{O}_2 \uparrow}
\)
[3 moles]
\(
2 \text { moles of } \mathrm{KClO}_3=2 \times 122.5=245 \mathrm{~g}
\)
3 moles of \(\mathrm{O}_2\) at STP occupy \(=\left(3 \times 22.4 \mathrm{dm}^3\right)\).
Thus, \(245 \mathrm{~g}\) of potassium chlorate will liberate \(67.2 \mathrm{dm}^3\) of oxygen gas.
Let ' \(x\) ' gram of \(\mathrm{KClO}_3\) liberate \(22.4 \mathrm{dm}^3\) of oxygen gas at S.T.P.
\(
\therefore \quad x=\frac{245 \times 22.4}{3 \times 22.4}=81.67 \mathrm{~g}
\)
\begin{aligned}
& 2 \mathrm{KClO}_3 \\
& {[2 \mathrm{moles}]}
\end{aligned} \longrightarrow 2 \mathrm{KCl}+\underset{[3 \mathrm{moles}]}{3 \mathrm{O}_2 \uparrow}
\)
[3 moles]
\(
2 \text { moles of } \mathrm{KClO}_3=2 \times 122.5=245 \mathrm{~g}
\)
3 moles of \(\mathrm{O}_2\) at STP occupy \(=\left(3 \times 22.4 \mathrm{dm}^3\right)\).
Thus, \(245 \mathrm{~g}\) of potassium chlorate will liberate \(67.2 \mathrm{dm}^3\) of oxygen gas.
Let ' \(x\) ' gram of \(\mathrm{KClO}_3\) liberate \(22.4 \mathrm{dm}^3\) of oxygen gas at S.T.P.
\(
\therefore \quad x=\frac{245 \times 22.4}{3 \times 22.4}=81.67 \mathrm{~g}
\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Which from following is a strong electrolyte?MHT CET 2025 Easy
- How many isoprene units are present in abscisic acid?MHT CET 2019 Medium
- What is half life time of a first order reaction if initial conc. of reactant is \(0.01 \mathrm{~mol} \mathrm{~L}^{-1}\) and rate of reaction is \(0.00352 \mathrm{~mol} \mathrm{~L}^{-1}\) minute \({ }^{-1}\) ?MHT CET 2023 Medium
- For the reaction, \(2 \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(g)\) \( \Delta H^{\circ}=-573.2 \mathrm{~kJ} \) The heat of decomposition of water per mole isMHT CET 2007 Medium
- Solubility of \(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2\) is 'S' mol \(\mathrm{dm}^{-3}\). Find solubility product.MHT CET 2025 Medium
- Calculate the value of \(\Delta G\) for following reaction at \(300 \mathrm{~K}\).
\(\mathrm{H}_2 \mathrm{O}_{(\mathrm{s})} \longrightarrow \mathrm{H}_2 \mathrm{O}_{(l)}\)\((\Delta \mathrm{H}=7 \mathrm{~kJ}, \Delta \mathrm{S}=\) \(24.8 \mathrm{~J} \mathrm{~K}^{-1})\)MHT CET 2023 Medium
More PYQs from MHT CET
- Identify the product obtained when benzonitrile is reduced by stannous chloride in presence of hydrochloric acid followed by acid hydrolysis.MHT CET 2023 Medium
- If the distance between two current carrying parallel wire is made \(\left(\frac{1}{3}\right)^{r d}\) then the magnitude of the force between them (the same current is passing through both wires)MHT CET 2022 Easy
- If \(A=\left[\begin{array}{ll}2 & 3 \\ 1 & 2\end{array}\right], B=\left[\begin{array}{ll}1 & 0 \\ 3 & 1\end{array}\right]\), then \(\mathrm{B}^{-1} \mathrm{~A}^{-1}=\)MHT CET 2020 Medium
- The mutual inductance of a pair of coils, each of ' \(\mathrm{N}\) ' turns, is ' \(\mathrm{M}\) ' henry. If a current of ' \(\mathrm{I}\) ' ampere in one of the coils is brought to zero in ' \(\mathrm{t}\) ' second, the e. m. f. induced per turn in the other coil in volt isMHT CET 2023 Hard
- If \(y\) is a function of \(x\) and \(\log (x+y)=2 x y\), then the value of \(y^{\prime}(0)\) isMHT CET 2023 Easy
- In a double slit experiment, the distance between slits is increased 10 times whereas their distance from screen is halved, then what is the fringe width?MHT CET 2007 Easy