General
✓✗Assertion: The second ionisation enthalpy of oxygen is higher than that of fluorine.
Reason: O+ has a stable half-filled 2p3 configuration.
Reason: O+ has a stable half-filled 2p3 configuration.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Among the following, which one has the highest cation to anion size ratio?
- CsF
- LiF
- NaF
- CsI
General
✓✗The valence of halogens towards hydrogen is
- 7
- 2
- 5
- 1
General
✓✗The correct order of acidic character is
- SiO2 > P4O10 > SO3 > Cl2O7
- P4O10 > SiO2 > Cl2O7 > SO3
- Cl2O7 > SO3 > P4O10 > SiO2
- SO3 > Cl2O7 > SiO2 > P4O10
General
✓✗Statement I: The first ionisation enthalpy of Mg is greater than that of Na.
Statement II: The second ionisation enthalpy of Mg is greater than that of Na.
Statement II: The second ionisation enthalpy of Mg is greater than that of Na.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗Across the 3d series, the atomic radii
- decrease steadily to zero
- decrease at first, then remain almost constant
- first increase then decrease sharply
- increase steadily
General
✓✗Assertion: Elements with atomic numbers 57 to 71 are placed in the same group (group 3).
Reason: Their differentiating electrons enter the 4f subshell, which hardly affects their outer configuration.
Reason: Their differentiating electrons enter the 4f subshell, which hardly affects their outer configuration.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗The species H−, Li+, Be2+ and B3+ are isoelectronic. Their sizes follow the order
- Be2+ > B3+ > H− > Li+
- Li+ > H− > Be2+ > B3+
- H− > Li+ > Be2+ > B3+
- B3+ > Be2+ > Li+ > H−
General
✓✗Ionisation enthalpy depends on all of the following EXCEPT
- the shielding by inner electrons
- the number of neutrons in the nucleus
- the nuclear charge
- the size of the atom
General
✓✗In which compound does oxygen show a positive oxidation state?
- Na2O
- OF2
- H2O2
- H2O
General
✓✗Which of the following pairs of atomic numbers represents elements of the same group?
- 12 and 30
- 7 and 16
- 11 and 20
- 12 and 38
General
✓✗The second electron gain enthalpy of an element is always
- positive
- negative
- zero
- equal to the first
General
✓✗Assertion: Lithium shows similarities with magnesium.
Reason: Lithium and magnesium have similar atomic numbers.
Reason: Lithium and magnesium have similar atomic numbers.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗On the Pauling scale, the element with the same electronegativity as nitrogen is about
- sulphur
- carbon
- oxygen
- chlorine
General
✓✗An element has the configuration [Ar] 3d5 4s2. Its group number is
- 2
- 5
- 17
- 7