Question 71 : The most electronegative element among the following is
1. sodium
2. bromine
3. fluorine
4. oxygen
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Question 72 : The mass number of a nucleus is
1. always less than its atomic number
2. the sum of the number of protons and neutrons present in the nucleus
3. always more than the atomic weight
4. a fraction
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Question 73 : The ionic radii of N^3-, O^2-, F^- and Na⁺ follows the order
1. N^3- > O^2- > F^- > Na⁺
2. N^3- > Na⁺ > O^2- > F^-
3. Na⁺ > O^2- > N^3- > F^-
4. O^2- > F^- > Na⁺ > N^3-
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Question 74 : The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is
1. helium
2. ozone
3. oxygen
4. methane
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Question 75 : In a Carbonyl group a carbon atom makes double bond with
1. Carbon
2. Oxygen
3. Hydrogen
4. None of the above
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Question 76 : How many atoms of oxygen are in a glucose molecule
1. 3
2. 4
3. 6
4. 10
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Question 77 : Which color is produce by Arsenic during flame test
1. Green
2. Red
3. Crimson
4. Blue
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Question 78 : Which one is the simplest aromatic hydrocarbon
1. Aspirin
2. Benzene
3. Chloride
4. Picric acid
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Question 79 : Number of hydrogen atoms in a Glucose molecule
1. 6
2. 8
3. 12
4. 14
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Question 80 : Except mercury which is the other metal that is liquid at standard conditions for temperature and pressure
1. Lead
2. Bromine
3. Barium
4. Magnesium
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