Question 61 : The number of electrons presents in H⁺ is
1. zero
2. one
3. two
4. three
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Question 62 : The hottest part of the gas flame is known as
1. luminous zone
2. dark zone
3. blue zone
4. non-luminous zone
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Question 63 : The metal that is used as a catalyst in the hydrogenation of oils is
1. Ni
2. Pb
3. Cu
4. Pt
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Question 64 : The hydronium ion is
1. H⁺
2. HO -
3. H2⁺
4. H₃O⁺
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Question 65 : The high reactivity of fluorine is due to
1. its high electro negativity
2. small size of fluorine atom
3. availability of d-orbitals
4. strong F - F bond
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Question 66 : The mass number of an atom is equal to
1. the number of protons
2. the number of protons and electrons
3. the number of nucleons
4. the number of neutrons
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Question 67 : The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
1. 4
2. 5
3. 2
4. zero
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Question 68 : The main active constituent of tea and coffee is
1. nicotine
2. chlorophyll
3. caffeine
4. aspirin
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Question 69 : The most commonly used bleaching agent is
1. alcohol
2. carbon dioxide
3. chlorine
4. sodium chlorine
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Question 70 : The mass of P₄O₁₀ that will be obtained from the reaction of 1.33 gram of P₄ and 5.07 of oxygen is
1. 2.05 gram
2. 3.05 gram
3. 4.05 gram
4. 5.05 gram
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