Practical & Analytical Chemistry · JEE Main previous year questions

2022 4 questions

1. Q742022 · 27 Jul 2022 · Shift 2

   $\mathrm{F}{\mathrm{e}}^{3+}$ 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.$\mathrm{F}{\mathrm{e}}_4{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}_3$
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   Answer: D

2. Q682022 · 30 Jun 2022 · Shift 1

   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.$[\text{Pt}({\text{NH}}_3{)}_4{\text{Br}}_2]{\text{Cl}}_2$
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   Answer: A

3. Q782022 · 26 Jun 2022 · Shift 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
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   Answer: D

4. Q742022 · 24 Jun 2022 · Shift 2

   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.${\mathrm{Ca}}^{2+}$
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   Answer: A