Sulphur

Q. The pair(s) of ions where both the ions are precipitated upon passing $H_{2}S$ gas in presence of dilute $HCl$, is/are:

1. $B{a}^{2+},Z{n}^{2+}$
2. $B{i}^{3+},F{e}^{3+}$
3. $C{u}^{2+},P{b}^{2+}$
4. $H{g}^{2+},B{i}^{3+}$

Q. Sulphur and the rest of the elements of group 16 are less electronegative than oxygen. Therefore, their atoms cannot accept electrons easily. They can acquire the $n{s}^{2}n{p}^6$ configuration by sharing two electrons with the atoms of the other elements and thus, exhibit a $+2$ oxidation state in their compounds. In addition to this, their atoms have vacant $d$-orbitals in their valence shell. Electrons can be promoted here from $s$ and $p$-orbitals of the same shell, hence they can show $+4$ and $+6$ oxidation states.
Like sulphur, oxygen does not show $+4$ and $+6$ oxidation states. The reason is that oxygen:

1. Has no $d$-orbitals in its valence shell
2. Is a gas, while sulphur is a solid
3. Has a higher ionization enthalpy when compared to sulphur
4. Has a higher electron affinity when compared to sulphur

Q.

Give the chemical tests to distinguish between the following gases:

Chlorine and nitrogen dioxide

Q.

Which of the following is a ‘False Statement?

1. Carius tube used in the estimation of sulphur in an organic compound (i) and (iv) are isotopes

2. Kjeldahl’s method is used for the estimation of nitrogen in an organic compound (ii) and (iii) are isotopes

3. Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as ${\mathrm{Mg}}_2{\mathrm{P}}_2{\mathrm{O}}_7$ by adding magnesia mixture

4. Carius method is used for the estimation of nitrogen in an organic compound

Q. The pair(s) of ions where BOTH the ions are precipitated upon passing $H_{2}S$ gas in presence of dilute $HCl$ is/are:

1. $B{a}^{2+},Z{n}^{2+}$
2. $B{i}^{3+},F{e}^{3+}$
3. $C{u}^{2+},P{b}^{2+}$
4. $H{g}^{2+},B{i}^{2+}$

Q. Which of the following is responsible for turning moist starch iodide paper blue when it is brought in contact with ozone 1. Liberatio of iodine 2 .liberatuon of oxygen 3 formation of alkali 4. All of these

Q. Give reasons:
(i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4 .
(ii) Transition metals show variable oxidation states.
(iii) Actinoids show irregularities in their electronic configurations.

Q. 2, 4 - DNP test can be used to identify

1. ether
2. amine
3. aldehyde
4. halogens

Q. What is the transition temperature of \(\alpha\) and \(\beta\)-sulphur?

Q.

The colour of the residue when${\mathrm{PbO}}_2$ decomposes to$\mathrm{PbO}\mathrm{and}{\mathrm{O}}_2$

1. Pink

2. Yellow

3. Green

4. White

Q. Which is correct order of their tendency of the given elements to form $M^{3-}$ ion$?$

1. $Bi>Sb>As>P>N$
2. $Bi<Sb<As<P<N$
3. $N<P<Sb<Bi<As$
4. $Bi>Sb\sim N\sim P>As$

Q. Freshly prepared solution of sodium nitroprusside is added to the sodium extract. Appearence of a deep violet colour indicated the presence of:

1. nitrogen
2. sulphur
3. both nitrogen and sulphur
4. halogen

Q. For the estimation of sulphur by Carius method, the organic compound is heated in Carius tube with:

1. $BaC{l}_2/HCl$
2. $BaC{l}_2/H_{2}S{O}_4$
3. $AgCl/HCl$
4. $CaC{l}_2/HCl$

Q. The energies of $d_{xy}$ and $d_{z^2}$
orbials in octahedral and tetrahedral transition metal complexes are such that :

1. $E\left(d_{xy}\right)>E\left(d_{z^2}\right)$ in both tetrahedral and octahedral complexes
2. $E\left(d_{xy}\right)<E\left(d_{z^2}\right)$ in both tetrahedral and octahedral complexea
3. $E\left(d_{xy}\right)>E\left(d_{z^2}\right)$ In tetrahedral a but $E\left(d_{xy}\right)<E\left(d_{z^2}\right)$ in octahedral complexes
4. $E\left(d_{xy}\right)<E\left(d_{z^2}\right)$ in tetrahedral a but $E\left(d_{xy}\right)<E\left(d_{z^2}\right)$ in octahedral complexes

Q. Assertion :$PbC{l}_2$ is more stable than $PbC{l}_4$ Reason: $PbC{l}_4$ is a powerful oxidising agent

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with examples.

Q.

When an alkali is added to an orange red solution of dichromate, it forms:

1. Ferrochrome

2. Chromate

3. Chromium trioxide

4. Chromyl chloride

Q. At a certain temperature, the half-life period of the thermal decomposition of a gaseous substance is as follows :

1. $1$
2. $2$
3. $2.5$
4. $3$

Q. The halogen $($Group $17$ elements$)$:

1. are highly electro positive
2. have an electron configuration of a noble gas less seven electrons
3. show variable oxidation state of $-1,+1,+3,+5$ and $+7$ in their various compounds
4. forms a volatile, covalent hydrides $HX$ in which the halogen $\left(X\right)$ shows an oxidation state of $+1$

Q. Why transition element have variable oxidation state?

Q. On adding $FeC{l}_3$ to the acidic Lassaignes solution a blood red colour is obtained. It indicates the presence of

1. S
2. C
3. N
4. Both S and N

Q. $K_4\left[Fe\right(CN{)}_6]$ can be used to detect one or more out of $F{e}^{2+}$, $F{e}^{3+}$, $Z{n}^{2+}$, $C{u}^{2+}$, $C{d}^{2+}$

1. All of these
2. $F{e}^{2+}$, $F{e}^{3+}$ only
3. $F{e}^{3+}$, $Z{n}^{2+}$, $C{u}^{2+}$ only
4. All but not $C{d}^{2+}$

Q. Match List-I with List-II:
$\begin{array}{cc}\text{List - I}& \text{List - II}\\ \text{Test/Reagents/Observation(s)}& \text{Species detected}\\ \text{(a)Lassaigne's Test}& \text{(i) Carbon}\\ \text{(b) Cu(II) oxide}& \text{(ii) Sulphur}\\ \text{(c) Silver nitrate}& \text{(iii) N, S, P and halogen}\\ \text{(d) The sodium fusion extract gives black precipitate with acetic acid \& lead acetate precipitate with acetic acid \& lead acetate}& \text{(iv) Halogen Specifically}\end{array}$

1. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
2. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
3. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Q. In sulphur detection of an organic compound, sodium nitroprusside solution is added to sodium extract. Formation of violet colour is due to:

1. $N{a}_{3}Fe(CN{)}_6$
2. $N{a}_4\left[Fe\right(CN{)}_{5}NOS]$
3. $Fe(CNS{)}_3$
4. None of these

Q. The valency of elements in group I A is:

1. $0$
2. $3$
3. $1$
4. $2$

Q. For the acidification of sodium extract for testing sulphur by lead acetate test, acetic acid was used in test tube A and sulphuric acid was used in test tube B. Which one of them will give the correct result?

1. Test tube A
2. Test tube B
3. Both of them
4. Neither of them

Q. Find the oxidation number of Magnesium in Magnesium chloride.

1. 1
2. 2
3. -1
4. -2

Q. Fill in the blanks
If nitrogen and sulphur both are present in an organic compound and it is fused with sodium. The sodium compound formed is ______.

Q. Metal nitrate $\left(A\right)$ on heating decomposes, leaving a residue $\left(B\right)$ which goes into the solution with dil. $HCl$. The solution of $\left(B\right)$ gives a white ppt. with an ammonium carbonate solution. Ppt. $C$ dissolves in dil. $HCl$ and the solution is treated with potassium chromate to yellow ppt. $\left(D\right)$. Solution $V$ with dil.$H_{2}S{O}_4$ also gives white ppt. $\left(E\right)$ insoluble in dil. $HCl$ and nitric acid. Precipitate $\left(E\right)$ is part of white pigment lithopone.

1. none of these
2. $BaCr{O}_4$
3. $PbCr{O}_4$
4. $CaCr{O}_4$

Q. Find the oxidation number of Oxygen in $CaO$.

1. 2
2. 1
3. -1
4. -2