The d- and f- Block Elements Test

Result

The d- and f- Block Elements Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

The property which is not characteristic of transition metals, is:

A
variable oxidation state

B
tendency to form complex

C
formation of coloured compounds

D
natural radioactivity
Solution
$$\mathbf{Characteristic\ of\ transition\ metals}$$
They have a large charge/radius ratio.
They are hard and have high densities.
They have high melting and boiling points.
They form compounds that are often paramagnetic.
They show variable oxidation states which differ by $$1$$ unit
They form coloured ions and compounds.
They form compounds with profound catalytic activity.
They form stable complexes.
All the transition elements are metals; this is because the number of electrons in the outermost shell is only. Transition metals are hard, malleable, and ductile due to the presence of strong metallic bonds.
A transition metal is one that forms one or more stable ions which have incompletely filled d orbitals.
$$\mathbf{Radioactive\ elements }$$

Radioactive elements are unstable isotopes that release subatomic particles or energy as they decay. Alpha decay releases two protons and two neutrons. It is potentially dangerous.

$$\because $$ The transition element are more stable they are not naturally radioactive.

$$\mathbf{\because Transition\ metal\ (d-block elements)\ don't\ show\ radioactivity\ in\ general\ while\ these \ are}$$
$$\mathbf{ characterized\ to\ show\ variable\ oxidation\ states,\ form\ complexes\ and\ coloured\ compounds.}$$

$$\mathbf{Hence\ the\ correct\ answer\ is\ (D)}$$
Question 2
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Which one of the following is paramagnetic in nature ?

A
$$Ni(CO)_4$$

B
$$[Ni(CN)_4]^{2-}$$

C
$$[NiCl_4]^{2-}$$

D
$$[Co(NH_3)_6]^{3+}$$

Solution
Question 3
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Which one of the following ions is diamagnetic?

A
$$Cr^{2+}$$

B
$$V^{2+}$$

C
$$Sc^{3+}$$

D
$$Ti^{3+}$$

Solution
Question 4
1 / -0

Which one of the following complexes is diamagnetic in nature?

A
$$[Cr(NH_3)_6]^{3+}$$

B
$$[FeF_6]^{3-}$$

C
$$[Co(NH_3)_6]^{3+}$$

D
$$[Fe(H_2O)_6]^{2+}$$

Solution
Question 5
1 / -0

A metal ion from the first transition has a magnetic moment (calculated) of $$3.87\ B.M$$. How many unpaired electrons are expected to be present in the ion?

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution
Question 6
1 / -0

Verdigris is:

A
basic copper acetate

B
basic lead acetate

C
basic lead

D
none

Solution

Verdigris is basic copper acetate.

$$ (Verdigris -(CH_3COO)_2Cu.Cu.(OH)_2) $$ is a blue-green powder used in green pigment and in dyes and also in the manufacture of insecticides and fungicides.
Question 7
1 / -0

When excess of $$SnCl_2$$ is added to a solution of $$HgCl_2$$, a white precipitate turning to grey is obtained. The grey colour is due to the formation of:

A
$$Hg_2Cl_2$$

B
$$SnCl_4$$

C
$$Sn$$

D
$$Hg$$

Solution
Question 8
1 / -0

The radius of $$La^{3+}$$ is $$1.06\ \overset {o}{A}$$, which of the following given values will be closest to the radius of $$Lu^{3+}$$ (At. no of $$Lu=71, La=57$$)?

A
$$ 1.6 \ {A}^{o}$$

B
$$ 1.4\ {A}^{o}$$

C
$$ 1.06\ {A}^{o}$$

D
$$ 0.85 \ {A}^{o}$$

Solution

$$La$$ and $$Lu$$ belongs to the lanthanoids (4f block elements of the inner transition elements) . Lanthanum is the $$1^{st}$$ element and Luthentium is the last one. In lanthanoids the atomic an ionic radii decreases with the increase in atomic number.
The given options has on $$0.85 {A}^{o}$$ satisfying the conditions .
Question 9
1 / -0

Which of the following is not correct?

A
$$[Fe(CN)_6]^{3-}$$ is weakly paramagnetic

B
$$[Fe(CN)_6]^{4-}$$ is strongly paramagnetic

C
$$[Ni(CN)_4]^{2-}$$ is diamagnetic

D
$$[NiCl_4]^{2-}$$ is paramagnetic

Solution

$$[Fe(CN)_6]^{-4}$$ is diamagnetic because it contains no unpaired electron.
Question 10
1 / -0

Which group contains coloured ions out of
$$Cu^+\ Ti^{4+}\ Co^{2+}\ Fe^{2+}$$

A
$$1,2,3,4$$

B
$$3,4$$

C
$$2,3$$

D
$$1,2$$

Solution

Group $$3^{rd} \ and \ 4^{th}$$ contains coloured ions