Which one of the following has maximum number of atoms?

a)1g of Ag(s) [Atomic mass of Ag = 108]

b) a)1g of Mg(s) [Atomic mass of Mg = 24]

c) a)1g of O₂(g) [Atomic mass of O = 16]

a)1g of Li(s) [Atomic mass of Li = 7]

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The number of protons, neutrons and electrons in 175Lu, respectively, are

(a) 71, 104 and 71

(b) 104, 71 and 71

(c) 71, 71 and 104

(d) 175, 104 and 71

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Identify the incorrect match.

Name IUPAC Official Name

(A)Unnilunium. (i)Mendelevium

(B)Unniltrium. (ii)Lawrencium.

(C)Unnilhexium. (iii) Seaborgium

(D)Unununnium. (iv) Darmstadtium.

(a)(A), (i) (b) (B), (ii) (c) (C), (iii). (d) (D), (iv)

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Which of the following, set of molecules will have zero dipole moment?

(a) Ammonia, beryllium difluoride, water, 1, 4-dichlorobenzene

(b) Boron trifluoride, hydrogen fluoride, carbon dioxide, 1, 3-dichlorobenzene

(c) Nitrogen trifluoride, beryllium difluoride, water, 1, 3-dichlorobenzene

(d) Boron trifluoride, beryllium difluoride, carbon dioxide, 1, 4-dichlorobenzene

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Identify a molecule which does not exist.

(a) He₂

(b) Li₂

(c) C₂

(d) O₂

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A mixture of N₂ and Ar gases in a cylinder contains 7 g of N₂ and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N₂ is

[Use atomic masses (in g mol–1) : N = 14, Ar = 40]

(a) 9 bar (b) 12 bar (c) 15 bar (d) 18 bar.

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The correct option for free expansion of an ideal gas under adiabatic condition is

(a) q = 0, DT = 0 and w = 0

(b) q = 0, DT < 0 and w > 0

(c) q < 0, DT = 0 and w = 0

(d) q > 0, DT > 0 and w > 0