d and f Block Elements

The ion that has a spin only magnetic moment of 5.9 BM is:

The basic character of transition metal monoxides follows the order:

The statements given below contains assertion and reason. Choose the correct option
Assertion (A): Cr, Mo and W possess the highest melting point in their respective series of elements.
Reason (R): Cr, Mo and W have stable half-filled elect...

$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ on heating with aqueous NaOH gives $\_\_\_\_$

Which one of the following species will impart colour to an aqueous solution?

Pick out the correct option
Assertion(A): Mercury is not considered as a transition element
Reason (R): Mercury is a liquid

Which of the following does not correctly represent the order of the property indicated against it?

The element with the highest third ionisation enthalpy is:

The product and its colour when $\mathrm{MnO}_2$ is fused with KOH in presence of $\mathrm{O}_2$ :

What is the spin only magnetic moment of the metal ion in $\mathbf{P}$ and the oxidation number of Sulphur in the oxidised product Z ?

Match the metals in Column II with their characteristic properties given in Column I.

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Choose the correct statement.

Choose the correct metal/ ion from the brackets which -------------------------
A. has chemical reactivity similar to that of the first few members of the Lanthanoids $(\mathrm{Zn}, \mathrm{Ca}, \mathrm{Fe}, \mathrm{Cu})$.
B. has stable $4 ...

The electronic configuration of the element with atomic number 78 is :

Find the correct matches.

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Which is the correct order of increasing number of unpaired electrons in the following ions?
$$\mathrm{A}=\mathrm{Cr}^{2+}(\mathrm{Z}=24) \mathrm{B}=\mathrm{Cu}^{2+}(\mathrm{Z}=29) \quad \mathrm{C}=\mathrm{Ni}^{2+}(\mathrm{Z}=28) \mathrm{D}...

Choose the statements which are incorrect in the case of Lanthanoids.
A. $\mathrm{Ce}^{4+}$ is diamagnetic while $\mathrm{Sm}^{3+}$ is paramagnetic.
B. The atomic size of the transition metals having atomic number greater than 71 are very c...

Larger number of oxidation states are exhibited by the actinoids than those of lanthanoids. The reason is:

Arrange the following ions in the decreasing order of covalent double bonds formed by the transition metal with oxygen.
A. $=$ chromate
$\mathrm{B}=$ permanganate
$\mathrm{C}=$ dichromate

The permanganate ion in acid medium acts as an oxidant and gets converted to its lower oxidation state. What would be the spin only magnetic moment of such reduced manganese ion?

Arrange the following ions in the increasing order of their \(\Delta H_{(\text {hydration})}\) values.
\(\mathrm{Cr}^{2+}, \mathrm{Co}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Ni}^{2+}\)

Match the compounds given in Column I with their characteristic features listed in Column II

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Choose the incorrect statement from the following

Identify the correct statement from the following.

The Lanthanoid ion which would form coloured compounds is -------------.
Atomic numbers: \(\mathrm{Yb}=70, \quad \mathrm{Lu}=71, \mathrm{Pr}=59, \quad \mathrm{La}=57\)

An inorganic compound \(\mathrm{W}\) undergoes the following reactions:
$$
\begin{gathered}
W+\frac{\mathrm{Na}_2 \mathrm{CO}_3}{\mathrm{O}_2 / \text { heat }} \rightarrow X+\frac{\mathrm{H}^{+}}{} \rightarrow Y_{(s)} \\
Y(a q)+\mathrm{KCl}...

The metallic ions that have almost same spin only magnetic moment are :
(i) \(\mathrm{Co}^{2+}\)
(ii) \(\mathrm{Mn}^{2+}\)
(iii) \(\mathrm{Cr}^{2+}\)
(iv) \(\mathrm{Cr}^{3+}\)

The correct order of increasing melting point is

Consider the following statements in respect of lanthanides, which of the statements are incorrect?
(i) \(\mathrm{La}(\mathrm{OH})_3\) is least basic among the hydroxides of lanthanides
(ii) The lanthanide ions $$\mathrm{Yb}^{2+}, \mathrm{L...

Identify the incorrect statement.

Find the correct matches of the substances, given in Column I, from their characteristic properties given in Column II.

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Match the following characteristics of transition metals given in Column I with the examples listed in Column II

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A volatile compound is formed by carbon monoxide and

\(\mathrm{Ti}^{2+}\) is purple while \(\mathrm{Ti}^{4+}\) is colourless because

In 3d-transmission series, which one has the least melting point?

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

Which of the following forms a colourless
solution in aqueous medium?

Formation of coloured solution is possible,
when metal ion in the compound contains

The electronic configuration of Cr\(^{3+}\) is