d-and f-Block Elements - ISC Class 12 Chemistry Questions with Answers, Page 4

78 past-paper questions on d-and f-Block Elements from ISC Class 12 Chemistry papers (2027-2018), newest first, in full. Questions 61-78 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.

2023 · 2 marks · Fill inOpen: Complete and balance the following chemical equations: ____ + ____ + ____ +…

Complete and balance the following chemical equations:

(i)[1.0]

$\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \longrightarrow$ ____ + ____ + ____ + ____

(ii)[1.0]

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{KI} + \text{H}_2\text{SO}_4 \longrightarrow$ ____ + ____ + ____ + ____

No answer yet.

2023 · 1 mark · MCQOpen: Which one of the following compounds is diamagnetic and colourless?

Choose the correct option.

Which one of the following compounds is diamagnetic and colourless?

(a)$\text{K}_2\text{Cr}_2\text{O}_7$
(b)$\text{ZnSO}_4$
(c)$\text{KMnO}_4$
(d)$\text{Cr}_2(\text{SO}_4)_3$

No answer yet.

2023 · 1 mark · Short answerOpen: salts are paramagnetic, while salts are diamagnetic.

Give reasons for the following.

$\text{Cu}^{2+}$ salts are paramagnetic, while $\text{Cu}^+$ salts are diamagnetic.

No answer yet.

2023 · 1 mark · CompleteOpen: ____ + ____ + ____ + ____

Complete and balance the following equation.

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{H}_2\text{S} \rightarrow$ ____ + ____ + ____ + ____

No answer yet.

2023 · 4 marks · Short answerOpen: Select and write the correct alternative from the choices given below: An alkyl…

Select and write the correct alternative from the choices given below:

(i)[1.0]

An alkyl isocyanide on complete reduction gives:

(a)Primary amine.
(b)Secondary amine.
(c)Tertiary amine.
(d)Carboxylic acid.

(ii)[1.0]

For a spontaneous reaction $E^\circ_{\text{cell}}$ and $\Delta G^\circ$ will be respectively:

(a)-ve and -ve
(b)-ve and +ve
(c)+ve and -ve
(d)+ve and +ve

(iii)[1.0]

Which of the following pairs of transition elements have exceptional electronic configuration?

(a)Sc and Cu
(b)Fe and Ni
(c)Cr and Cu
(d)Mn and Zn

(iv)[1.0]

For a first order reaction, when $100\text{ g}$ of the reactant is taken, $75\text{ g}$ of the reactant reacts in 8 minutes. If $200\text{ g}$ of the same reactant is taken, in how much time $150\text{ g}$ of the reactant will react?

(a)8 minutes
(b)16 minutes
(c)20 minutes
(d)24 minutes.

No answer yet.

2023 · 2 marks · Short answerOpen: Why are , and not regarded as transition elements?

Why are $\text{Zn}$, $\text{Cd}$ and $\text{Hg}$ not regarded as transition elements?

No answer yet.

2023 · 1 mark · Short answerOpen: Transition elements and their compounds act as catalyst.

Give reasons for the following.

Transition elements and their compounds act as catalyst.

No answer yet.

2023 · 1 mark · Short answerOpen: compounds are more stable than compounds.

Give reasons for the following.

$\text{Mn}^{2+}$ compounds are more stable than $\text{Fe}^{2+}$ compounds.

No answer yet.

2023 · 1 mark · Short answerOpen: is more basic than .

Give reasons for the following.

$\text{La(OH)}_3$ is more basic than $\text{Lu(OH)}_3$.

No answer yet.

2022 · 3 marks · Fill inOpen: Fill in the blanks by choosing the appropriate word(s) from those given in the…

Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: (two, four, $\text{sec}^{-1}$, diamagnetic, acetaldehyde, $\text{mol}^{-1}\text{L }\text{sec}^{-1}$, paramagnetic, formaldehyde, acetone, ethanol)

(i)[1.0]

When the concentration of a reactant of first order reaction is doubled, the rate of reaction becomes ___________ times. The unit of rate constant ($k$) for the first order reaction is ___________.

(ii)[1.0]

The transition metals show ___________ character because of the presence of unpaired electrons while $\text{Cu}^+$ is ___________ because its electronic configuration is $[\text{Ar}]3d^{10}$.

(iii)[1.0]

Calcium formate on distillation gives ___________ but the distillation of calcium formate and calcium acetate gives ___________.

No answer yet.

2022 · 3 marks · Short answerOpen: What is the basic difference between the electronic configuration of transition…

(i)

What is the basic difference between the electronic configuration of transition and inner transition elements?

(ii)

Why are $\text{Zn}^{2+}$ ions colourless while $\text{Ni}^{2+}$ ions are green in colour?

No answer yet.

2020 · 3 marks · Short answerOpen: Explain the following: Transition metals and their compounds generally exhibit…

Explain the following:

(i)

Transition metals and their compounds generally exhibit a paramagnetic behaviour.

(ii)

There is an increase in density of elements from titanium ($Z = 22$) to copper ($Z = 29$) in the 3d series of transition elements.

(iii)

$\text{K}_2\text{Cr}_2\text{O}_7$ acts as a powerful oxidising agent in acidic medium.

No answer yet.

2019 · 3 marks · Fill inOpen: Complete and balance the following chemical equations. ______ + ______ + ______…

Complete and balance the following chemical equations.

(i)

$\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{H}_2\text{C}_2\text{O}_4 \rightarrow$ ______ + ______ + ______ + ______

(ii)

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{KI} \rightarrow$ ______ + ______ + ______ + ______

(iii)

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \rightarrow$ ______ + ______ + ______ + ______

No answer yet.

2019 · 3 marks · Short answerOpen: Explain why: Transition elements form alloys. salts are white whereas salts are…

Explain why:

(i)

Transition elements form alloys.

(ii)

$\text{Zn}^{2+}$ salts are white whereas $\text{Cu}^{2+}$ salts are coloured.

(iii)

Transition metals and their compounds act as catalyst.

No answer yet.

2018 · 3 marks · Short answerOpen: Explain why: is more stable than towards oxidation to state. (At. no. of , )…

Explain why:

(i)

$\text{Mn}^{2+}$ is more stable than $\text{Fe}^{2+}$ towards oxidation to $+3$ state. (At. no. of $\text{Mn} = 25$, $\text{Fe} = 26$)

(ii)

Transition elements usually form coloured ions.

(iii)

Zr and Hf exhibit similar properties. (At. no. of $\text{Zr} = 40$, $\text{Hf} = 72$)

No answer yet.

2018 · 3 marks · Fill inOpen: Complete and balance the following chemical equations: _____ + ______ + ______…

Complete and balance the following chemical equations:

(i)

$\text{KMnO}_4 + \text{KI} + \text{H}_2\text{SO}_4 \rightarrow$ _____ + ______ + ______ + _______

(ii)

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{H}_2\text{S} \rightarrow$ _____ + ______ + ______ + _______

(iii)

$\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \rightarrow$ _____ + ______ + ______ + _______

No answer yet.

2018 · 3 marks · Short answerOpen: Account for the following/Explain why: Transition metals exhibit variable…

Account for the following/Explain why:

(i)

Transition metals exhibit variable oxidation states.

(ii)

$\text{Zr}$ ($Z = 40$) and $\text{Hf}$ ($Z = 72$) have almost identical radii.

(iii)

Transition metals and their compounds act as a catalyst.

No answer yet.

2018 · 3 marks · Fill inOpen: Complete the following chemical equations: _______ _______ _______

Complete the following chemical equations:

(i)

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \rightarrow$ _______

(ii)

$\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{H}_2\text{S} \rightarrow$ _______

(iii)

$\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{H}_2\text{C}_2\text{O}_4 \rightarrow$ _______

No answer yet.

d-and f-Block Elements - ISC Class 12 Chemistry Questions with Answers, Page 4

Questions on other pages on d-and f-Block Elements

Other Chemistry chapters