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  4. Classification of Elements and Periodicity in Properties Chapter-Wise Test 2

Classification of Elements and Periodicity in Properties Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a chalcogen?

Chalcogens are group 16 elements. Te (group 16) is a chalcogen, while As (group 15), Br (group 17), and Ge (group 14) are not.

As
Br
Te
Ge
3

Arrange Be, Mg, Ca in order of increasing atomic radius.

Atomic radius increases down a group due to additional electron shells. For group 2: Be < Mg < Ca.

Ca < Mg < Be
Be < Mg < Ca
Mg < Be < Ca
Ca < Be < Mg
2

Which element in the third period has the highest second ionization enthalpy?

Second ionization enthalpy is highest when removing an electron from a stable \(\ce{X+}\) ion. Na (after losing one electron, becomes \(\ce{Na+}\) with \(1s^2 2s^2 2p^6\)) has the highest value in period 3 compared to Mg, Si, or P.

Na
Mg
Si
P
1

Which ion among the following isoelectronic species with 10 electrons has the lowest ionic radius?

For isoelectronic species (10 electrons), ionic radius decreases with increasing nuclear charge. \(\ce{Al^3+}\) (Z=13) has the lowest radius compared to \(\ce{Na+}\), \(\ce{Mg^2+}\), or \(\ce{F^-}\).

\(\ce{Al^3+}\)
\(\ce{Na+}\)
\(\ce{Mg^2+}\)
\(\ce{F^-}\)
1

Which element in group 15 has the highest electronegativity?

Electronegativity decreases down group 15. N (period 2, 3.0) has the highest value among N, P, As, and Sb.

P
As
Sb
N
4

Which element forms an acidic oxide predominant in group 15?

Group 15 elements form acidic oxides, especially higher oxides. P forms \(\ce{P2O5}\), which is acidic, unlike Be (basic), Ca (basic), or Zn (amphoteric).

P
Be
Ca
Zn
1

Which element in the third period has the highest fourth ionization enthalpy?

Fourth ionization enthalpy peaks when removing an electron from a stable \(\ce{X^3+}\) ion. Al (after losing three electrons, becomes \(\ce{Al^3+}\) with \(1s^2 2s^2 2p^6\)) has the highest value in period 3.

Al
Na
Mg
Si
1

Which group 17 element forms the strongest hydrogen bonds in its hydride?

Hydrogen bonding strength depends on electronegativity and size. F (in \(\ce{HF}\)) forms the strongest hydrogen bonds due to its high electronegativity (4.0) and small size, unlike Cl, Br, or I.

Cl
Br
I
F
4

Which d-block element in period 4 has the highest density?

In period 4 d-block (Sc to Zn), density increases with atomic mass and decreases with volume. Cu (group 11) has the highest density due to its compact structure.

Sc
Ti
Cr
Cu
4

Which element has the ground state electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2\)?

This configuration (Z=23) corresponds to V (period 4, group 5), with \(3d^3 4s^2\), distinguishing it from Ti (\(3d^2 4s^2\)), Cr (\(3d^5 4s^1\)), or Mn (\(3d^5 4s^2\)).

Ti
V
Cr
Mn
2

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