1.
Which of the following is amphoteric oxide? A
$${V_2}{O_5},C{r_2}{O_3}$$
B
$$M{n_2}{O_7},Cr{O_3}$$
C
$$CrO,{V_2}{O_5}$$
D
$${V_2}{O_5},{V_2}{O_4}$$
Answer :
$${V_2}{O_5},C{r_2}{O_3}$$
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2.
The outer electron configuration of $$Gd\left( {Atomic\,No.:64} \right)\,{\text{is}}:$$ A
$$4{f^3}5{d^5}6{s^2}$$
B
$$4{f^8}5{d^0}6{s^2}$$
C
$$4{f^4}5{d^4}6{s^2}$$
D
$$4{f^7}5{d^1}6{s^2}$$
Answer :
$$4{f^7}5{d^1}6{s^2}$$
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The configuration of $$Gd\,{\text{is}}\,\,4{f^7}5{d^1}6{s^2}.$$
3.
The stability of dihalides of $$Si,Ge,Sn$$ and $$Pb$$ increases steadily in the sequence A
$$Pb{X_2} < < Sn{X_2} < < Ge{X_2} < < Si{X_2}$$
B
$$Ge{X_2} < < Si{X_2} < < Sn{X_2} < < Pb{X_2}$$
C
$$Si{X_2} < < Ge{X_2} < < Pb{X_2} < < Sn{X_2}$$
D
$$Si{X_2} < < Ge{X_2} < < Sn{X_2} < < Pb{X_2}$$
Answer :
$$Si{X_2} < < Ge{X_2} < < Sn{X_2} < < Pb{X_2}$$
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Reluctance of valence shell electrons to participate in bonding is called inert pair effect. The stability of lower oxidation state ( + 2 for group 14 element ) increases on going down the group. So the correct order is
$$Si{X_2} < < Ge{X_2} < < Sn{X_2} < < Pb{X_2}$$
4.
The common oxidation states of $$Ti$$ are A
+2, +3
B
+3, +4
C
3, -4
D
+2, +3, +4
Answer :
+3, +4
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The most common oxidation state of titanium are +3 and +4.
5.
Calomel$$\left( {H{g_2}C{l_2}} \right)$$ on reaction with ammonium hydroxide gives A
$$HgO$$
B
$$H{g_2}O$$
C
$$N{H_2} - Hg - Hg - Cl$$
D
$$Hg\,N{H_2}\,Cl$$
Answer :
$$Hg\,N{H_2}\,Cl$$
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$$H{g_2}C{l_2} + 2N{H_4}OH \to HgN{H_2}Cl + 2{H_2}O$$
6.
Which of the following statements is correct about stability of the complexes of lanthanoids? A
Stability of complexes increases as the size of lanthanoid decreases.
B
Stability of complexes decreases as the size of lanthanoid decreases.
C
Lanthanoids do not form complexes.
D
All the complexes of lanthanoids have same stability.
Answer :
Stability of complexes increases as the size of lanthanoid decreases.
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7.
Which of the following statements is not correct? A
$$La{\left( {OH} \right)_3}$$ is less basic than $$Li{\left( {OH} \right)_3}$$
B
In lanthanide series, ionic radius of $$L{n^{3 + }}$$ $$ion$$ decreases
C
$$La$$ is actually an element of transition series rather lanthanide
D
Atomic radius of $$Zr$$ and $$Hf$$ are same because of lanthanide contraction
Answer :
$$La{\left( {OH} \right)_3}$$ is less basic than $$Li{\left( {OH} \right)_3}$$
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$$L{a^{3 + }}$$ $$ions$$ larger than $$L{i^{3 + }}.$$ So, it easily gives $$O{H^ - }$$ $$ion$$ $$La{\left( {OH} \right)_3}$$ is more basic than $$Li{\left( {OH} \right)_3}.$$ In lanthanides the basic character of hydroxides
decreases as the ionic radius decreases.
8.
Which of the following ions will exhibit colour in aqueous solutions? A
$$L{a^{3 + }}\left( {Z = 57} \right)$$
B
$$T{i^{3 + }}\left( {Z = 22} \right)$$
C
$$L{u^{3 + }}\left( {Z = 71} \right)$$
D
$$S{c^{3 + }}\left( {Z = 21} \right)$$
Answer :
$$T{i^{3 + }}\left( {Z = 22} \right)$$
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Key Idea Colour is obtained as a consequence of $$d-d$$ ( or $$f-f$$ ) transition, and for $$d-d$$ ( or $$f-f$$ ) transition,
presence of unpaired electrons is the necessary condition.
9.
Which of the following arrangements does not represent the correct order of the property stated against it? A
$$Sc < Ti < Cr < Mn:$$ number of oxidation states
B
$${V^{2 + }} < C{r^{2 + }} < M{n^{2 + }} < F{e^{2 + }}:$$ paramagnetic behaviour
C
$$N{i^{2 + }} < C{o^{2 + }} < F{e^{2 + }} < M{n^{2 + }}:$$ ionic size
D
$$C{o^{3 + }} < F{e^{3 + }} < C{r^{3 + }} < S{c^{3 + }}:$$ stability in aqueous solution
Answer :
$${V^{2 + }} < C{r^{2 + }} < M{n^{2 + }} < F{e^{2 + }}:$$ paramagnetic behaviour
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Number of unpaired electrons in $$F{e^{2 + }}$$ is less than $$M{n^{2 + }},$$ so $$F{e^{2 + }}$$ is less paramagnetic than $$M{n^{2 + }}.$$
10.
A metal $$M$$ and its compound can give the following observable changes in a consequence of reactions A
$$Mg$$
B
$$Pb$$
C
$$Zn$$
D
$$Sn$$
Answer :
$$Zn$$
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\[\begin{align}
& \underset{\left( M \right)}{\mathop{Zn}}\,\xrightarrow{dil.\,\,HN{{O}_{3}}}\overset{\text{Brown}}{\mathop{\underset{\begin{smallmatrix}
\text{Colourless} \\
\text{solution}
\end{smallmatrix}}{\mathop{Zn{{\left( N{{O}_{3}} \right)}_{2}}}}\,\xrightarrow[aq.]{NaOH}}}\,\underset{\text{White ppt}\text{.}}{\mathop{Zn{{\left( OH \right)}_{2}}}}\, \\
& \xrightarrow[NaOH]{\text{Excess}}N{{a}_{2}}\underset{\text{Soluble}}{\mathop{\left[ Zn{{\left( OH \right)}_{4}} \right]}}\,\xrightarrow{{{H}_{2}}S}\underset{\text{White ppt}\text{.}}{\mathop{ZnS}}\, \\
\end{align}\]