Classification of Elements and Periodicity in Properties
Test 16

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which element in group 14 has the highest ionization enthalpy after losing three electrons?

Fourth ionization enthalpy is highest for C (removing an electron from \(\ce{C^3+}\) with \(1s^2\)) due to its small size and stable configuration, compared to Si, Ge, or Sn.

Si
Ge
Sn
C
4

What is the temporary systematic IUPAC name for the element with atomic number 115?

For \(Z = 115\): 1 (un), 1 (un), 5 (pent) → ununpentium (before its official name, Moscovium).

Ununtrium
Ununpentium
Ununseptium
Ununoctium
2

Which d-block element in period 5 has the highest melting point?

In period 5 d-block (Y to Cd), melting point peaks with strong metallic bonding. Mo (group 6, \(4d^5 5s^1\)) has the highest melting point due to maximum unpaired electrons.

Y
Zr
Tc
Mo
4

Which pair of elements from the same period shows the greatest difference in electronegativity?

In period 2, the largest electronegativity difference is between Li (1.0) and F (4.0), a gap of 3.0, compared to other pairs like Be-B or C-N.

Be, B
Li, F
C, N
N, O
2

What is the temporary systematic name of the element with atomic number 115?

For \(Z=115\): 1 (un), 1 (un), 5 (pent) → ununpentium (before being named Moscovium).

Ununtrium
Ununseptium
Ununoctium
Ununpentium
4

Which element in group 17 has the highest boiling point?

Boiling point increases down group 17 due to stronger London dispersion forces with larger size. I (period 5) has the highest boiling point among F, Cl, Br, and I.

F
Cl
Br
I
4

What is the formula of the compound formed by aluminium and oxygen?

Al (group 13, valence 3) and O (group 16, valence 2) form \(\ce{Al2O3}\) by cross-multiplying valences.

\(\ce{AlO}\)
\(\ce{AlO2}\)
\(\ce{Al2O3}\)
\(\ce{Al3O2}\)
3

Which group 15 element forms a hydride with the lowest thermal stability?

Thermal stability of group 15 hydrides decreases down the group due to weaker X-H bonds. \(\ce{BiH3}\) (Bi, largest) has the lowest stability among \(\ce{NH3}\), \(\ce{PH3}\), \(\ce{AsH3}\), and \(\ce{BiH3}\).

\(\ce{NH3}\)
\(\ce{PH3}\)
\(\ce{AsH3}\)
\(\ce{BiH3}\)
4

Which of the following has the highest first ionization enthalpy among the third period elements?

First ionization enthalpy increases across a period. Among Na, Mg, Si, and Ar, Ar (group 18, period 3) has the highest value due to its stable noble gas configuration.

Na
Mg
Ar
Si
3

Which oxide is amphoteric in nature?

Amphoteric oxides, formed by elements near the metal-non-metal boundary, react with both acids and bases. \(\ce{As2O3}\) (group 15) is amphoteric, unlike \(\ce{Li2O}\) (basic), \(\ce{SO2}\) (acidic), or \(\ce{CO}\) (neutral).

\(\ce{Li2O}\)
\(\ce{As2O3}\)
\(\ce{SO2}\)
\(\ce{CO}\)
2

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