Assertion (A): Hydrogen is a better fuel than CNG. Reason (R): Hydrogen is highly explosive and difficult to store safely. MCQ with Answer and Explanation
Assertion (A): Hydrogen is a better fuel than CNG. Reason (R): Hydrogen is highly explosive and difficult to store safely.
A. A is false but R is true.
B. A is true but R is false.
C. Both A and R are true but R is NOT the correct explanation of A.
D. Both A and R are true and R is the correct explanation of A.
Answer: Option C
Solution (By JKSSB Mock Tests)
Hydrogen has a higher calorific value than CNG, making it a better fuel in terms of energy output per unit mass. However, R states it is explosive and hard to store, which is a disadvantage, not the reason it is a better fuel. Thus, both are true, but R does not explain A.
Explanation:
The half-life is the time required for half of the radioactive atoms to decay. After 10 years (1 half-life), 1/2 remains. After 20 years (2 half-lives), 1/4 remains. After 30 years (3 half-lives), the fraction remaining is (1/2)^3 = 1/8. Thus, one-eighth of the original sample will remain.
Explanation:
Nickel (finely divided) catalyzes the addition of hydrogen to unsaturated vegetable oils to form solid vanaspati ghee. It provides surface for reaction. Platinum and palladium also work but are expensive. Iron is used in Haber process. V₂O₅ in Contact process.
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