Practical & Analytical Chemistry · JEE Main previous year questions

Match the List-I with List-II : $$\begin{array}{llll}& \text{List-I Cations}& & \text{List-II Group reagents}\\ \text{A.}& \mathrm{P}{\mathrm{b}}^{2+},\mathrm{C}{\mathrm{u}}^{2+}& \text{i)}& {\mathrm{H}}_2\mathrm{S}\text{ gas in presence of dilute HCl}\\ \text{B.}& \mathrm{A}{\mathrm{l}}^{3+},\mathrm{F}{\mathrm{e}}^{3+}& \text{ii)}& (\mathrm{N}{\mathrm{H}}_4{)}_2\mathrm{C}{\mathrm{O}}_3\text{ in presence of }\mathrm{N}{\mathrm{H}}_4\mathrm{OH}\\ \text{C.}& \mathrm{C}{\mathrm{o}}^{2+},\mathrm{N}{\mathrm{i}}^{2+}& \text{iii)}& \mathrm{N}{\mathrm{H}}_4\mathrm{OH}\text{ in presence of }\mathrm{N}{\mathrm{H}}_4\mathrm{Cl}\\ \text{D.}& \mathrm{B}{\mathrm{a}}^{2+},\mathrm{C}{\mathrm{a}}^{2+}& \text{iv)}& {\mathrm{H}}_2\mathrm{S}\text{ in presence of }\mathrm{N}{\mathrm{H}}_4\mathrm{OH}\end{array}$$ Correct match is -

1. A.A $\to$ i, B $\to$ iii, C $\to$ iv, D $\to$ ii
2. B.A $\to$ i, B $\to$ iii, C $\to$ ii, D $\to$ iv
3. C.A $\to$ iii, B $\to$ i, C $\to$ iv, D $\to$ ii
4. D.A $\to$ iv, B $\to$ ii, C $\to$ iii, D $\to$ i

A chloride salt solution acidified with dil.$\mathrm{HN}{\mathrm{O}}_3$ gives a curdy white precipitate, [A], on addition of $\mathrm{AgN}{\mathrm{O}}_3$. [A] on treatment with $\mathrm{N}{\mathrm{H}}_4\mathrm{OH}$ gives a clear solution B. A and B are respectively :

1. A.$\mathrm{H}[\mathrm{AgC}{\mathrm{l}}_3]$ & $(\mathrm{N}{\mathrm{H}}_4)[\mathrm{Ag}(\mathrm{OH}{)}_2]$
2. B.$\mathrm{AgCl}$ & $[\mathrm{Ag}(\mathrm{N}{\mathrm{H}}_3{)}_2]\mathrm{Cl}$
3. C.$\mathrm{H}[\mathrm{AgC}{\mathrm{l}}_3]$ & $[\mathrm{Ag}(\mathrm{N}{\mathrm{H}}_3{)}_2]\mathrm{Cl}$
4. D.$\mathrm{AgCl}$ & $(\mathrm{N}{\mathrm{H}}_4)[\mathrm{Ag}(\mathrm{OH}{)}_2]$

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The alkali metals and their salts impart characteristic colour to reducing flame. Reason R : Alkali metals can be detected using flame tests. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A.A is not correct but R is correct
2. B.A is correct but R is not correct
3. C.Both A and R are correct and R is the correct explanation of A
4. D.Both A and R are correct but R is NOT the correct explanation of A

$\mathrm{F}{\mathrm{e}}^{3+}$ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of :

1. A.${\left[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6\right]}_2\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$
2. B.$\mathrm{F}{\mathrm{e}}_2{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}_2$
3. C.$\mathrm{F}{\mathrm{e}}_3{\left[\mathrm{Fe}(\mathrm{OH}{)}_2(\mathrm{CN}{)}_4\right]}_2$
4. D.$\mathrm{F}{\mathrm{e}}_4{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}_3$

Correct formula of the compound which gives a white precipitate with ${\text{BaCl}}_2$ solution, but not with ${\text{AgNO}}_3$ solution, is :

1. A.$[\text{Co}({\text{NH}}_3{)}_5\text{Br}]{\text{SO}}_4$
2. B.$[\text{Co}({\text{NH}}_3{)}_5{\text{SO}}_4]\text{Br}$
3. C.$[\text{Pt}({\text{NH}}_3{)}_4{\text{Cl}}_2]{\text{Br}}_2$
4. D.$[\text{Pt}({\text{NH}}_3{)}_4{\text{Br}}_2]{\text{Cl}}_2$

s-block element which cannot be qualitatively confirmed by the flame test is :

1. A.Li
2. B.Na
3. C.Rb
4. D.Be

In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

1. A.${\mathrm{Cu}}^{2+}$
2. B.${\mathrm{Sr}}^{2+}$
3. C.${\mathrm{Ba}}^{2+}$
4. D.${\mathrm{Ca}}^{2+}$

To an aqueous solution containing ions such as $\mathrm{A}{\mathrm{l}}^{3+}$, $\mathrm{Z}{\mathrm{n}}^{2+}$, $\mathrm{C}{\mathrm{a}}^{2+}$, $\mathrm{F}{\mathrm{e}}^{3+}$, $\mathrm{N}{\mathrm{i}}^{2+}$, $\mathrm{B}{\mathrm{a}}^{2+}$ and $\mathrm{C}{\mathrm{u}}^{2+}$ was added conc. $\mathrm{HCl}$, followed by ${\mathrm{H}}_2\mathrm{S}$. The total number of cations precipitated during this reaction is/are :

1. A.1
2. B.3
3. C.4
4. D.2

An inorganic Compound 'X' on treatment with concentrated ${\text{H}}_2{\text{SO}}_4$ produces brown fumes and gives dark brown ring with ${\text{FeSO}}_4$ in presence of concentrated ${\text{H}}_2{\text{SO}}_4$. Also Compound 'X' gives precipitate 'Y', when its solution in dilute $\text{HCl}$ is treated with ${\text{H}}_2\text{S}$ gas. The precipitate 'Y' on treatment with concentrated ${\text{HNO}}_3$ followed by excess of ${\text{NH}}_4\text{OH}$ further gives deep blue coloured solution, Compound 'X' is :

1. A.$\text{Co}({\text{NO}}_3{)}_2$
2. B.$\text{Pb}({\text{NO}}_2{)}_2$
3. C.$\text{Cu}({\text{NO}}_3{)}_2$
4. D.$\text{Pb}({\text{NO}}_3{)}_2$

Ceric ammonium nitrate and $\mathrm{CHC}{\mathrm{l}}_3$/alc. KOH are used for the identification of functional groups present in _________ and _________ respectively.

1. A.amine, alcohol
2. B.alcohol, phenol
3. C.alcohol, amine
4. D.amine, phenol

Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.

1. A.ketoses, proteins
2. B.proteins, ketoses
3. C.aldoses, ketoses
4. D.ketoses, aldoses

The volume (in mL) of 0.125 M $\mathrm{AgN}{\mathrm{O}}_3$ required to quantitatively precipitate chloride ions in 0.3 g of $[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6]\mathrm{C}{\mathrm{l}}_3$ is _______. ${\mathrm{M}}_{[\mathrm{Co}(\mathrm{N}{\mathrm{H}}_3{)}_6]\mathrm{C}{\mathrm{l}}_3}=267.46\text{ g/mol}$ ${\mathrm{M}}_{\mathrm{AgN}{\mathrm{O}}_3}=169.87\text{ g/mol}$

1. A.
2. B.
3. C.
4. D.

Which one of the following is likely to give a precipitate with ${\text{AgNO}}_3$ solution ?

1. A.${\text{CHCl}}_3$
2. B.$({\text{CH}}_3{)}_3\text{CCl}$
3. C.${\text{CCl}}_4$
4. D.${\text{CH}}_2=\text{CH}-\text{Cl}$

Among the following, the molecule expected to be stabilized by anion formation is : ${\mathrm{C}}_2,{\mathrm{O}}_2,\mathrm{NO},{\mathrm{F}}_2$

1. A.${\mathrm{C}}_2$
2. B.NO
3. C.${\mathrm{O}}_2$
4. D.${\mathrm{F}}_2$

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of $[\mathrm{Fe}({\mathrm{H}}_2\mathrm{O}{)}_6{]}_2[\mathrm{Fe}(\mathrm{CN}{)}_6]$, respectively, are :

1. A.2.84 and 5.92
2. B.4.9 and 0
3. C.0 and 4.9
4. D.0 and 5.92

1. A.
2. B.
3. C.
4. D.

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aformentioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is :

1. A.${\text{CO}}_3^{2-}$
2. B.${\text{SO}}_4^{2-}$
3. C.${\text{Cl}}^{-}$
4. D.${\text{S}}^{2-}$

Which type of ‘defect’ has the presence of cations in the interstitial sites?

1. A.Metal deficiency defect
2. B.Schottky defect
3. C.Vacancy defect
4. D.Frenkel defect

A solution containing a group-IV cation gives a precipitate on passing ${\mathrm{H}}_2\mathrm{S}$. A solution of this precipitate in dil.HCl produces a white precipitate with $\mathrm{NaOH}$ solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :

1. A.$\mathrm{C}{\mathrm{o}}^{2+}$
2. B.$\mathrm{N}{\mathrm{i}}^{2+}$
3. C.$\mathrm{M}{\mathrm{n}}^{2+}$
4. D.$\mathrm{Z}{\mathrm{n}}^{2+}$

The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is :

1. A.288 pm
2. B.398 pm
3. C.618 pm
4. D.144 pm