Multiple Choice QuestionsWhich of the following pair of ions have same paramagnetic moment?
Cu2+, Ti3+
Mn2+, Cu2+
Ti4+, Cu2+
Ti3+, Ni2+
A.
Cu2+, Ti3+
Among the given pair of ions, Cu2+ and Ti3+ have same paramagentic moment. This is because these ions have one unpaired electron.
(i) 29Cu = [Ar] 3d10 4s1
Cu2+ = [Ar] 3d9
(ii) 22Ti = [Ar] 3d2 4s2
Ti3+ = [Ar] 3d2
Which of the following is a favourable factor for cation formation?
High electronegativity
High electron affinity
Low ionisation potential
Smaller atomic size
Average C-H bond energy is 416 kJ mol-1. Which of the following is correct?
CH4 (g) + 416 kJ → C (g) + 4H (g)
CH4 (g) → C (g) + 4H (g) + 416 kJ
CH4 (g) + 1664 kJ → C (g) + 4H (g)
CH4 (g) → C (g) + 4H (g) + 1664 kJ
At 27°C, 500 mL of helium diffuses in 30 minutes. What is the time (in hours) taken for 1000 mL of SO2 to diffuse under same experimental conditions?
240
3
2
4
Study the following table:
| Buffer solution | Volume (in mL) of 0 M weak acid | Volume (in mL) of 0.1 M sodium salt of weak acid |
| I | 4.0 | 4.0 |
| II | 4.0 | 40.0 |
| III | 40.0 | 4.0 |
| IV | 0.1 | 10.0 |
Which of the two sets of butter solutions have least pH?
I and II
I and III
II and III
II and IV
Which of the following is an endothermic reaction?
N2 (g) + 3H2 (g) - 92 kJ → 2NH3 (g)
N2 (g) + O2 (g) + 180.8 kJ → 2NO (g)
H2 (g) + Cl2 (g) → 2HCl (g) + 184.6 kJ
C (graphite) + 2H2 (g) → CH2 (g) + 74.8 kJ
Which of the following is correct?
1H1 and 2He3 are isotopes
6C14 and 7N14 are isotopes
19K39 and 20Ca40 are isotones
9F19 and 11Na24 are isodiaphers
The correct structure of 4-bromo-3-methyl but-1-ene is
Br-CH=C(CH3)2
CH2=CH-CH(CH3)-CH2Br
CH2=C(CH3)CH2Br
CH3-C(CH3)=CHCH2-Br
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