question_answer4)
The value
for copper is positive (+0.34 V). What is possible the reason for this?
question_answer7) Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
View Answer play_arrow question_answer8)
Calculate
the 'spin only' magnetic moment of ion (Z
= 27).
question_answer9) Explain why Cu+ ion is not stable in aqueous solutions?
View Answer play_arrowquestion_answer10) Actinoid contraction is greater from element to than lanthanoid contraction. Why?
View Answer play_arrow question_answer11)
Write
down the electronic configuration of
(a) (b)
(c)
(d)
(e)
(f)
(g)
(h)
question_answer20) What are the different oxidation states exhibited by the lanthanoids?
View Answer play_arrowquestion_answer32) What are disproportionation reactions? Give two examples.
View Answer play_arrowElement | Fe | Co | Ni | Cu |
Metallic radii/pm | 126 | 125 | 125 | 128 |
question_answer60)
Which of the following is
amphoteric oxide?
(a)
(b)
(c)
(d)
question_answer66)
When acidified solution is added to
salt then
changes to
(a)
(b)
(c)
(d)
question_answer78)
Which of the following will
not act as oxidising agents?
(a) (b)
(c)
(d)
question_answer80) Why does copper not replace hydrogen from acids?
View Answer play_arrow question_answer81)
Why values for Mn, Ni and Zn are
more negative than expected?
question_answer82) Why first ionisation enthalpy of Cr is lower than that of Zn?
View Answer play_arrowquestion_answer83) Transition elements show high melting points. Why?
View Answer play_arrow question_answer85)
Out of and
,
which is more stable and why?
question_answer89) lonisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
View Answer play_arrow question_answer96)
of
Cu is +0.34V while that of Zn is -0.76 V. Explain.
question_answer100) Match the catalysts given in Column I with the processes given in Column II.
Column I (Catalyst) | Column II (Process) | |
A. | Ni in the presence of hydrogen | 1. Ziegler-Natta catalyst |
B. |
![]() |
2. Contact process |
C |
![]() |
3. Vegetable oil to ghee |
D. | Finely divided iron | 4. Sandmeyer reaction |
E. |
![]() |
5. Haber's process |
6. Decomposition of ![]() |
question_answer101) Match the compounds/elements given in Column I with uses given in Column II.
Column 1 (Compound/element) | Column 11 (Use) |
A. Lanthanoid oxide B. Lanthanoid C. Misch metall D. Magnesium based alloy is constituent of E. Mixed oxides of lanthanoids are employed | 1. Production of iron alloy 2. Television screen 3. Petroleum cracking 4. Lanthanoid metal + iron 5. Bullets 6. X-ray screen |
question_answer102) Match the properties given in Column I with the metals given in Column II.
Column 1 (Property) | Column 11 (Metal) |
A. An element which can show+8 oxidation state B. 3d block element that can show upto +7 oxidation state C. 3d block element with highest melting point | 1. Mn 2. Cr 3. Os 4. Fe |
Column 1 | Column 11 | |
A. |
Oxidation state of Mn in ![]() |
1. +2 |
B. | Most stable oxidation state of Mn is | 2. +3 |
C. | Most stable oxidation state of Mn in oxides is | 3. +4 |
D. | Characteristic oxidation state of lanthanoids is | 4. +5 |
5. +7 |
question_answer104) Match the solutions given in Column I and the colours given in Column II.
Column 1 (Aqueous solution of salt) | Column 11 (Colour) |
A. ![]() |
1. Green |
B. ![]() |
2. Light pink |
C. ![]() |
3. Blue |
D. ![]() |
4. Pale green |
E. ![]() |
5. Pink |
6. Colourless |
question_answer105) Match the property given in Column I with the element given in Column II.
Column I (Property) | Column II (Element) | |
A. | Lanthanoid which shows + 4 oxidation state | 1. Pm |
B. | Lanthanoid which can show +2 oxidation state | 2. Ce |
C. | Radioactive lanthanoid | 3. Lu |
D. |
Lanthanoid which has ![]() |
4. Eu |
configuration in +3 oxidation state | ||
E. |
Lanthanoid which has ![]() |
5. Gd |
6. Dy |
question_answer106) Match the properties given in Column I with the metals given in Column II.
Column 1 (Property) | Column 11 (Metal) |
A. Element with highest second ionisation
enthalpy
B. Element with highest third ionisation enthalpy
C. M in![]() |
1. Col 2. Cr 3. Cu, 4. Zn 5. Ni |
question_answer107)
Assertion (A) iodide is not known.
Reason (R)
oxidises I" to iodine.
question_answer112)
Identify A to f and also
explain the reaction involved.
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