Questions 351–360 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 36 of 65

Question 16

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Acceptable wavefunctions for a quantum particle must be:
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Question 17

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The characters of E, C₂, σᵥ, and σ′ᵥ symmetry operations, in this order, for valid irreducible representation(s) of the C₂ᵥ point group is/are:
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Question 18

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The normal mode(s) of vibration of H₂O is/are:
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Question 19

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A reversible heat engine absorbs 20 kJ of heat from a source at 500 K and dissipates it to the reservoir at 400 K. The efficiency of the heat engine is ______ %.

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Question 20

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Among the following eight compounds,
Diagram for Chemistry question 20

the number of compound(s) which can exhibit stereoisomerism is ______.

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Question 21

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The Mo–Mo bond order in [η⁵-C₅H₅)Mo(CO)₂]₂ which obeys the 18-electron rule is ______.

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Question 22

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The change in enthalpy (ΔH) for the reaction
2 P (s) + 3 Br₂ (l) → 2 PBr₃ (l)
is −243 kJ. In this reaction, if the amount of phosphorus consumed is 3.1 g, the change in enthalpy (rounded off to two decimal places) is ______ kJ.
[Atomic Wt. of P = 31]

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Question 23

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The number of signal(s) in the

H NMR spectrum of the following compound
Diagram for Chemistry question 23

recorded at 25 °C in CDCl₃ is __________.

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Question 24

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A 5 V battery delivers a steady current of 1.5 A for a period of 2 h. The total charge that has passed through the circuit is ______ Coulombs.

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Question 25

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The spin-only magnetic moment of [Co(H₂O)₆]²⁺ (rounded off to one decimal place) is ______ BM.

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