Classification of Elements and Periodicity in Properties
Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which oxide is neutral in nature?

Neutral oxides do not react with acids or bases. \(\ce{CO}\) (group 14) is neutral, unlike \(\ce{K2O}\) (basic), \(\ce{P2O5}\) (acidic), or \(\ce{ZnO}\) (amphoteric).

\(\ce{K2O}\)
\(\ce{CO}\)
\(\ce{P2O5}\)
\(\ce{ZnO}\)
2

Which pair of elements exhibits a diagonal relationship?

B (group 13, period 2) and Si (group 14, period 3) show a diagonal relationship due to similar size and properties, unlike the other pairs.

Li, Na
B, Si
Be, Mg
C, N
2

What is the general outer electronic configuration of group 16 elements?

Group 16 elements (chalcogens) have 6 valence electrons, with outer configuration \(ns^2 np^4\).

\(ns^2 np^2\)
\(ns^2 np^3\)
\(ns^2 np^5\)
\(ns^2 np^4\)
4

What is the formula of the hydride formed by phosphorus?

P (group 15) forms \(\ce{PH3}\) with hydrogen, following the trend of group 15 hydrides.

\(\ce{PH}\)
\(\ce{PH2}\)
\(\ce{PH3}\)
\(\ce{PH4}\)
3

Which element forms an oxide with the formula \(\ce{X2O}\), where X is a group 1 element?

Group 1 elements (except Li) form oxides of the type \(\ce{X2O}\). Rb, being in group 1, forms \(\ce{Rb2O}\), unlike Mg, Al, or P.

Rb
Mg
Al
P
1

Which element in group 13 has the highest tendency to form covalent compounds due to its polarizing power?

Polarizing power increases with smaller size and higher charge density. B³⁺ (smallest in group 13) has the highest tendency to form covalent compounds (e.g., \(\ce{BF3}\)) compared to Al, Ga, or In.

B
Al
Ga
In
1

Which group 13 element forms a hydride that is electron-deficient?

B forms \(\ce{B2H6}\), an electron-deficient hydride with three-center two-electron bonds, unlike Al (\(\ce{AlH3}\), polymeric), Ga, or In, which form less distinct hydrides.

Al
Ga
In
B
4

Arrange the following elements in order of increasing first ionization enthalpy: B, C, N, O.

First ionization enthalpy generally increases across period 2, but N (half-filled \(2p^3\)) has higher stability than O. Order: B < C < O < N.

C < B < O < N
B < C < O < N
B < O < C < N
O < B < C < N
2

Which of the following elements has the highest first ionization enthalpy?

First ionization enthalpy increases across a period due to increasing nuclear charge and decreases down a group due to increased shielding. Among Li, Be, Na, and Mg, Be (second period, group 2) has the highest value due to its stable \(2s^2\) configuration.

Be
Li
Na
Mg
1

Which of the following elements is a halogen?

Halogens belong to group 17. Among O, S, Se, and Br, only Br is in group 17, making it a halogen.

Br
O
S
Se
1

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