Question 91 : What is the mass percentage of oxygen in carbon dioxide (CO2)
1. 30.50%
2. 50.90%
3. 65.80%
4. 72.70%
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Question 92 : What is the mass percentage of carbon in carbon dioxide (CO2)
1. 15.80%
2. 20.10%
3. 27.30%
4. 32.30%
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Question 93 : Which one is the naturally occuring heaviest element
1. Mercury
2. Thorium
3. Uranium
4. Protactinium
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Question 94 : Total number of halogen elements found in the periodic table is
1. 3
2. 5
3. 8
4. 13
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Question 95 : Which one is the most reactive gaseous element
1. Chlorine
2. Bromine
3. Iodine
4. Flourine
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Question 96 : The nucleus of an atom consists of
1. Protons and Neutrons
2. Neutrons and Electrons
3. Electrons only
4. None of the above
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Question 97 : Which one is the purest form of carbon
1. Coal
2. Graphite
3. Diamond
4. Iron
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Question 98 : Which one is not a pure form of carbon
1. Coal
2. Graphite
3. Diamond
4. Gold
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Question 99 : Which gas is most stable at room temperature
1. H2
2. N2
3. F2
4. O2
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Question 100 : In nuclear reactors heavy water is used as a
1. Fuel
2. Projectile
3. Moderator
4. Arestor
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