D and F Block Elements MCQ Questions & Answers in Inorganic Chemistry | Chemistry
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331.
A metal, M forms chlorides in its + 2 and + 4 oxidation states. Which of the following statements about these chlorides is correct?
A
$$MC{l_2}$$ is more ionic than $$MC{l_4}$$
B
$$MC{l_2}$$ is more easily hydrolysed than $$MC{l_4}$$
C
$$MC{l_2}$$ is more volatile than $$MC{l_4}$$
D
$$MC{l_2}$$ is more soluble in anhydrous ethanol than $$MC{l_4}$$
Answer :
$$MC{l_2}$$ is more ionic than $$MC{l_4}$$
Metal atom in the lower oxidation state forms the ionic bond and in the higher oxidation state the covalent bond. because higher oxidation state means small size and great polarizing power and hence greater the covalent character. Hence $$MC{l_2}$$ is more ionic than $$MC{l_4}.$$
332.
A water sample has ppm level concentration of the following metals: $$Fe = 0.2;\,Mn = 5.0;\,Cu = 3.0;\,Zn = 5.0.$$ The metal that makes the water sample unsuitable for drinking is:
A
$$Cu$$
B
$$Mn$$
C
$$Fe$$
D
$$Zn$$
Answer :
$$Mn$$
The water sample containing $$Mn = 5\,ppm$$ is unsuitable for drinking as the prescribed level for $$Mn$$ in drinking water is $$0.5ppm.$$
333.
What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
A
$$C{r_2}O_7^{2 - }\,{\text{and}}\,{H_2}O\,{\text{are}}\,{\text{formed}}$$
B
$$CrO_4^{2 - }\,{\text{is}}\,{\text{reduced}}\,{\text{to}}\, + 3\,{\text{state}}\,{\text{of}}\,Cr$$
C
$$CrO_4^{2 - }\,{\text{is}}\,{\text{oxidized}}\,{\text{to}}\, + 7\,{\text{state}}\,{\text{of}}\,Cr$$
D
$$C{r^{3 + }}\,{\text{and}}\,C{r_2}O_7^{2 - }\,{\text{are}}\,{\text{formed}}$$
When a solution of potassium chromate is treated with an excess of dilute nitric acid. Potassium dichromate and $${H_2}O$$ are formed.
$$\eqalign{
& 2{K_2}Cr{O_4} + 2HN{O_3} \to {K_2}C{r_2}{O_7} + 2KN{O_3} + {H_2}O \cr
& {\text{Hence}}\,C{r_2}O_7^ - \,{\text{and}}\,{H_2}O\,{\text{are}}\,{\text{formed}}{\text{.}} \cr} $$
334.
Which of the following $$d$$ - block element has half-filled penultimate as well as valence subshell?
335.
In the laboratory, manganese $$(II)$$ salt is oxidised to permanganate ion in aqueous solution by
A
hydrogen peroxide
B
conc. nitric acid
C
peroxy disulphate
D
dichromate
Answer :
peroxy disulphate
In laboratory, manganese $$\left( {II} \right)ion$$ salt is oxidised to permagnate ion in aqueous solution by peroxodi-sulphate.
$$\mathop {2M{n^{2 + }} + {S_2}O_8^{2 - } + 8{H_2}O}\limits_{{\text{peroxodisulphate ion}}} \to 2MnO_4^ - + 10\,SO_4^{2 - } + 16{H^ + }$$
336.
When a small amount of $$KMn{O_4}$$ is added to concentrated $${H_2}S{O_4},$$ a green oily compound is obtained which is highly explosive in nature. Compound may be :
A
$$MnS{O_4}$$
B
$$M{n_2}{O_7}$$
C
$$Mn{O_2}$$
D
$$M{n_2}{O_3}$$
Answer :
$$M{n_2}{O_7}$$
$$KMn{O_4}$$ reacts with $${H_2}S{O_4}$$ to form $$M{n_2}{O_7}$$ which is highly explosive substance.
$$2KMn{O_4} + {H_2}S{O_4} \to {K_2}S{O_4} + M{n_2}{O_7} + {H_2}O$$