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
✓✗The common oxidation state of alkaline earth metals is
- −2
- +3
- +1
- +2
General
✓✗The element which is the least electronegative among the following is
- Li
- Cs
- Na
- K
General
✓✗Across a period, electronegativity generally
- increases
- first increases then decreases
- decreases
- remains constant
General
✓✗Statement I: The Pauling electronegativity of C is 2.5.
Statement II: The C−H bond is highly polar.
Statement II: The C−H bond is highly polar.
- 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
✓✗Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?
- Cl < F < O < S
- S < O < Cl < F
- O < S < F < Cl
- F < S < O < Cl
General
✓✗The amount of energy needed to convert 1.0 g of gaseous Na atoms completely into Na+ ions is (IE1 of Na = 496 kJ mol−1, Na = 23)
- 43.1 kJ
- 496 kJ
- 21.6 kJ
- 11.4 kJ
General
✓✗Across a period from left to right, the atomic radius generally
- remains the same
- decreases
- first increases and then decreases
- increases
General
✓✗Assertion: Metallic character decreases across a period.
Reason: Ionisation enthalpy increases across a period.
Reason: Ionisation enthalpy increases across a period.
- 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 element with Z = 114 has been discovered recently. To which family/group does it belong, and what is its electronic configuration?
- Nitrogen family, [Rn] 5f14 6d10 7s2 7p6
- Halogen family, [Rn] 5f14 6d10 7s2 7p5
- Carbon family, [Rn] 5f14 6d10 7s2 7p2
- Oxygen family, [Rn] 5f14 6d10 7s2 7p4
General
✓✗The element with atomic number 56 belongs to
- group 2, period 5
- group 6, period 2
- group 12, period 6
- group 2, period 6
General
✓✗Among N3−, O2−, F− and Na+, the largest is
- Na+
- O2−
- F−
- N3−
General
✓✗The element with the temporary name ununtrium (113) is now officially named
- oganesson
- tennessine
- nihonium
- moscovium
General
✓✗Assertion: Elements in the same group show similar chemical properties.
Reason: They have similar outer electronic configurations.
Reason: They have similar outer electronic configurations.
- 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 electronic configuration of an element is 1s2 2s2 2p6 3s2 3p3. The atomic number of the element just below it in the periodic table is
- 33
- 34
- 49
- 36