55.
The metal does not give H2 on treatment with dilute HCL is
A. Zn B. Fe
C. Ag D. Ca
Answer & Explanation
Answer: Option C
Explanation:
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56.
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is
A. 1 gram of molecule
B. 0.5 gram of molecule
C. 5 gram of molecule
D. 10 gram of molecule
Answer & Explanation
Answer: Option C
Explanation:
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57.
The most extensive, commercially useful source of thorium as monazite sand occurs in India at
A. Orissa coast
B. Travancore coast
C. West Bengal coast
D. Gujarat coast
Answer & Explanation
Answer: Option B
Explanation:
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58.
The main active constituent of tea and coffee is
A. nicotine B. chlorophyll
C. caffeine D. aspirin
Answer & Explanation
Answer: Option C
Explanation:
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59.
The maximum number of isomers for an alkene with molecular formula C4H8 is
A. 5 B. 4
C. 2 D. 3
Answer & Explanation
Answer: Option B
Explanation:
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60.
The hardest form of carbon is
A. coke B. graphite
C. diamond D. charcoal
Answer & Explanation
Answer: Option C
Explanation:
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