Important Questions of Classification of Elements and Periodicity in Properties Chemistry | Zigya

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture? 

  • The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group

  • In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group

  • Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens

  • Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens

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12.

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic acid and electric fields?

(a) n = 1, l = 0, m = 0
(b) n = 2, l = 0, m = 0
(c) n = 2, l = 1, m = 1
(d) n = 3, l = 2, m = 1
(e) n = 3, l = 2, m = 0

  • (a) and (b)

  • (b) and (c)

  • (c) and (d)

  • (c) and (d)

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13.

In which of the following arrangements the order is NOT according to the property indicated against it?

  • Al3+ < Mg2+ < Na+ < F- Increasing ionic size

  • B < C < N < O Increasing first ionization enthalpy

  • I < Br < F < Cl Increasing electron gain enthalpy (with negative sign)

  • I < Br < F < Cl Increasing electron gain enthalpy (with negative sign)

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14.

Which of the following statements in relation to the hydrogen atom is correct?

  • 3s orbital is lower in energy than 3p orbital

  • 3p orbital is lower in energy than 3d orbital

  • 3s and 3p orbitals are of lower energy than 3d orbital

  • 3s and 3p orbitals are of lower energy than 3d orbital

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15.

Which one the following ions has the highest value of ionic radius?

  • Li+

  • F-

  • O2-

  • O2-

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16.

Which of the following atoms should have the highest Ist electron affinity?

  • F

  • O

  • N

  • C


17.

The decreasing order of basic character of K2O, BaO, CaO and MgO is

  • K2O > BaO > CaO > MgO

  • K2O > CaO > BaO > MgO

  • MgO > BaO > CaO > K2O

  • MgO > CaO > BaO > K2O


18.

Among Be, B, Mg and Al, the second ionisation potential is maximum for

  • B

  • Be

  • Mg

  • Al


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19.

In case of heteronuclear diatomics of the type AB, where A is more electronegative than B, bonding molecular orbital resembles the character of A more than that of B. The statement

  • is false

  • is true

  • cannot be evaluated since data is not sufficient

  • is true only for certain systems


20.

The ground state electronic configuration of CO molecule is

  • 221π42

  • 2221π22π2

  • 221π222π2

  • 21π222


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