Among the elements from atomic number 1 to 36, the number of elem

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 Multiple Choice QuestionsMultiple Choice Questions

211.

The "spin only'' magnetic moment of Ni2+ in aqueous solution would be [At. no. of Ni = 28]

  • 15 BM

  • 2 BM

  • 8 BM

  • 6 BM


212.

The correct set of four quantum numbers for the outermost electron of sodium (Z = 11) is

  • 3, 1, 1, 12

  • 3, 2, 1, 12

  • 3, 0, 0, 12

  • 3, 1, 0, 12


213.

The statement that is not correct is

  • Angular quantum number signifies the shape of the orbital

  • Energies of stationary states in hydrogen like atoms is inversely proportional to the square of the principal quantum number

  • Total number of nodes for 3s-orbital is three

  • The radius of the first orbit of He is half that of the first orbit of hydrogen atom


214.

The two electrons have the following set of quantum numbers, P =3,2, -2 +1/2, Q =3,0,0 + 1/2. Which of the following statement is true?

  • P and Q have same energy

  • P has greater energy than Q

  • P has lesser energy than Q

  • P and Q represent same electron


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215.

Among the elements from atomic number 1 to 36, the number of elements which have an unpaired electron in their s subshell is

  • 2

  • 7

  • 6

  • 9


C.

6

Among the elements from, atomicc number 1 to 36, following six elements have an unpaired electron in their s-subshell-

1H = 1s1

3Li = 1s2, 2s1

11Na = 1s2, 2s2 2p6, 3s1

19K = 1s2, 2s22p6, 3s2 3p6, 4s1

24Cr = 1s2, 2s2 2p6, 3s2 3p6, 4s1, 3d5

29Cu = 1s2, 2s2 2p6, 3s2 3p6, 4s1, 3d10


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216.

The energy of electron in the nth Bohr orbit of H-atom is

  • -13.6n2 eV

  • -13.6n eV

  • -13.6n4 eV

  • -13.6n3 eV


217.

Consider the following sets of quantum numbers. Which of the following setting is not permissible arrangement of electrons in an atom?

  • n = 4; l = 0; m = 0; s = -12

  • n = 5; l = 3; m = 0; s = +12

  • n = 3; l = 2; m = -2; s = -12

  • n = 3; l = 2; m = -3; s = +12


218.

No two electron can have the same values of ........ quantum numbers.

  • one

  • two

  • three

  • four


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219.

The compound in which cation is isoelectronic with anion is :

  • NaCl

  • CsF

  • NaI

  • K2S


220.

What is the effect of increasing pressure on the dissociation of PCl5 according to the equation?

PCl5 (g)  PCl3 (g) + Cl(g)

  • Dissociation decreases

  • Dissociation increases

  • Dissociation does not change

  • None of the above


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