Periodic Classification of Elements- 06

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Q1. Which is the correct order of ionic sizes (At. No. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71) ? *

1 point

Sn > Ce > Yb > Lu

Ce > Sn > Yb > Lu

Lu > Yb > Sn > Ce

Sn > Yb > Ce > Lu

Q2. The order of increasing sizes of atomic radii among the elements O, S, Se and As is *

1 point

O < S < Se < As

O < S < As < Se

As < S < O < Se

Se < S < As < O

Q3. In the ions P–3, S–2 and Cl–, the increasing order of size is *

1 point

Cl– < S–2 < P–3

P–3 > S–2 > Cl–

P–3 < S–2 < Cl–

S–2 < Cl– < P–3

Q4. Which of the following is correct ? *

1 point

Isoelectronic ions have same nuclear charge

Isoelectronic ions have same number of electrons

All are correct

Isoelectronic ions have same neutrons

Q5. Why the size of an anion is larger than the parent atom? *

1 point

(b) Due to decrease in effective nuclear charge.

(d) Both (a) and (b)

(a) Due to increased repulsion among the electrons.

Q6. Arrange S, P, As in order of increasing ionisation energy *

1 point

As < P < S

As < S < P

S < P < As

P < S < As

Q7. The statement that is not correct for periodic classification of elements is *

1 point

Non-metallic elements are less in number than metallic elements.

The properties of elements are periodic function of their atomic numbers.

For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.

The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period

Q8. Consider the following changes *

1 point

None of them

E1 > E2

E1 < E2

E1 = E2

Q9. Of the given electronic configurations for the elements, which electronic configuration indicates that there will be abnormally high difference in the second and third ionization energy for the element? *

1 point

1s2 2s2 2p6 3s2

1s2 2s2 2p6 3s2 3p5

1s2 2s2 2p6 3s2 3p4

1s2 2s2 2p6 3s1

Q10. Alkali metals are powerful reducing agents because *

1 point

their ionic radii are large

their ionisation potential is low

these are monovalent

these are metals

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