Multiple Choice QuestionsWhich of the following pair of ions have same paramagnetic moment?
Cu2+, Ti3+
Mn2+, Cu2+
Ti4+, Cu2+
Ti3+, Ni2+
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
C.
19K39 and 20Ca40 are isotones
Isotones are the species that have equal number of neutrons.
No. of neutrons in 19K39 = 39 - 19 = 20
No. of neutrons in 20Ca40 = 40 - 20 = 20
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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