Hydrogen peroxide is used as a rocket propellant because it: MCQ with Answer and Explanation

Hydrogen peroxide is used as a rocket propellant because it:
A. Is extremely stable
B. Decomposes to release oxygen and steam, providing thrust
C. Is a fuel
D. Burns in air
Answer: Option B
Solution (By JKSSB Mock Tests)
High-concentration H₂O₂ (e.g., 80-90%) decomposes rapidly in the presence of a catalyst to produce superheated steam and oxygen: 2H₂O₂ → 2H₂O + O₂ + heat. This generates high-pressure gas used for propulsion (monopropellant) or as oxidizer in bipropellant systems. It is not a fuel; it provides oxygen for combustion. It must be handled carefully due to instability.

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Practice More chemistry Questions

Question #1
Atomic number of an element is 17. It belongs to which group and period?
A. Group 18, Period 3
B. Group 17, Period 3
C. Group 1, Period 3
D. Group 16, Period 2

Correct Answer: Option B


Explanation:
Atomic number 17 is chlorine. Electronic configuration: 2,8,7. Period number = number of shells = 3. Group number = 10 + valence electrons (for p-block elements) = 10+7 = 17. Hence Group 17 (halogens), Period 3. Group 1 has 1 valence electron, Group 16 has 6, Group 18 has 8 (except He). Simple method: period = number of shells.

This question belongs to: Science chemistry
Question #2
Which of the following is a chemical property of acids?
A. React with metals to produce hydrogen gas
B. Turn blue litmus red
C. Sour taste
D. Conduct electricity in solution

Correct Answer: Option A


Explanation:
Reacting with metals (e.g., Zn + 2HCl → ZnCl₂ + H₂) to produce hydrogen gas is a chemical property because new substances are formed. Sour taste is physical sensation, color change of litmus is an indicator of chemical reaction but is not itself a chemical property; reactivity is. Conductivity is physical. Chemical properties describe a substance's ability to undergo chemical change.

This question belongs to: Science chemistry
Question #3
Rusting of iron requires:
A. Both oxygen and water
B. Only water
C. Only oxygen
D. Carbon dioxide and water

Correct Answer: Option A


Explanation:
Rusting is an electrochemical process requiring both oxygen and water (moisture). The overall reaction: 4Fe + 3O₂ + 2xH₂O → 2Fe₂O₃·xH₂O. In the absence of either, rusting does not occur. Salt accelerates rusting by increasing conductivity. Prevention methods include painting, greasing, galvanization, and cathodic protection. Rust is hydrated iron(III) oxide, a reddish-brown flaky substance, not protective.

This question belongs to: Science chemistry