NEET (NTA)-National Eligibility cum Entrance Test (Medical) Chemistry: Questions 1165 - 1172 of 1258

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Question number: 1165

» Classification of Elements & Periodicity » Ionization Enthalpy

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MCQ▾

Question

Calculate the energy needed to convert three moles of sodium atoms in the gaseous state to sodium ions. The ionization energy of sodium is

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Choice (4)Response

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Question does not provide sufficient data or is vague

Question number: 1166

» Atomic Structure » Dual Nature of Matter

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Calculate the number of photons emitted in 10 hours by a sodium lamp.

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Choice (4)Response

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Question number: 1167

» Atomic Structure » Bohr Model of Hydrogen Atom

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The ionization energy of atom is. The ionization energy of ion will be –

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Choice (4)Response

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Question number: 1168

» Classification of Elements & Periodicity » Ionization Enthalpy

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Question

I. E. of one H atom is . The I. E. of H atom in is -

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Choice (4)Response

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All of the above

Question number: 1169

» Classification of Elements & Periodicity » Present Form of the Periodic Table

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The law of triads is applicable to -

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Question number: 1170

» Atomic Structure » Bohr Model of Hydrogen Atom

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Atomic radius is the order of and nuclear radius is the order of . Calculate what fraction of atom is occupied by nucleus?

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Question number: 1171

» Classification of Elements & Periodicity » Present Form of the Periodic Table

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Noble gases have maximum electron affinity.

Reason (Ꭱ)

High electron affinity shows that the electron is loosely bonded to the atom.

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Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

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Ꭺ is false but Ꭱ is true

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Both Ꭺ and Ꭱ are false

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Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 1172

» Atomic Structure » Dual Nature of Matter

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Question

Naturally occuring boron consists of two isotops whose atomic weights are and The atomic weight of natural boron is . Calculate the percentage of each isotope in natural boron-

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Choice (4)Response

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