General
✓✗Statement I: SO2 and SO3 are both acidic.
Statement II: SO3 is more acidic than SO2.
Statement II: SO3 is more acidic than SO2.
- 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 has the smallest size?
- F−
- Mg2+
- Al3+
- Na+
General
✓✗Down a group, the atomic radius generally
- remains the same
- becomes zero
- decreases
- increases
General
✓✗B shows a diagonal relationship with
- C
- Al
- Mg
- Si
General
✓✗The IUPAC temporary name of element 120 is
- unnilbium
- unbinilium
- ununbium
- unbiunium
General
✓✗Mendeleev left gaps in his periodic table and predicted the properties of eka-aluminium and eka-silicon. These elements were later discovered as
- aluminium and silicon
- scandium and titanium
- indium and tin
- gallium and germanium
General
✓✗X(g) → X+(g) needs 738 kJ mol−1, and X(g) → X2+(g) needs 2189 kJ mol−1. The second ionisation enthalpy of X is
- 2927 kJ mol−1
- 738 kJ mol−1
- 2189 kJ mol−1
- 1451 kJ mol−1
General
✓✗The second ionisation enthalpy of an element is always
- higher than the first
- zero
- lower than the first
- equal to the first
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 correct order of electron gain enthalpy (most negative first) for O, S and Se is
- S > Se > O
- O > S > Se
- Se > S > O
- O > Se > S
General
✓✗In the periodic table, from left to right in a period, the atomic volume
- remains the same
- first decreases and then increases
- increases
- decreases
General
✓✗Oxides of non-metals are generally
- basic
- amphoteric
- acidic
- ionic
General
✓✗Ionisation enthalpy generally ___ across a period.
- decreases
- increases
- remains constant
- first decreases then increases
General
✓✗Electron gain enthalpy generally becomes more negative
- in noble gases
- in alkali metals
- down a group
- across a period from left to right
General
✓✗The first ionisation enthalpy of hydrogen is 1312 kJ mol−1. The energy needed to ionise 0.5 mol of hydrogen atoms is
- 2624 kJ
- 656 kJ
- 1312 kJ
- 328 kJ