Chemical & Ionic Equilibrium · JEE Main previous year questions

2018 9 questions

1. Q622018 · 15 Apr 2018 · Shift 1

   The minimum volume of water required to dissolve 0.1 g lead (II) chloride to get a saturated solution (${\text{K}}_{\text{sp}}$ of ${\text{PbCl}}_2=3.2\times 10^{-8}$, atomic mass of Pb = 207 u ) is :

   1. A.0.36 L
   2. B.17.98 L
   3. C.0.18 L
   4. D.1.798 L
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   Answer: C

2. Q702018 · 15 Apr 2018 · Shift 1

   Which of the following is a Lewis acid?

   1. A.${\text{PH}}_3$
   2. B.$\text{B}({\text{CH}}_3{)}_3$
   3. C.NaH
   4. D.${\text{NF}}_3$
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   Answer: B

3. Q832018 · 15 Apr 2018 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: D

4. Q882018 · 15 Apr 2018 · Shift 1

   Xenon hexafluoride on partial hydrolysis produces compounds 'X' and 'Y' . Compounds 'X' and 'Y' and the oxidation state of Xe are respectively :

   1. A.${\text{XeO}}_2(+4)$ and ${\text{XeO}}_3(+6)$
   2. B.${\text{XeOF}}_4(+6)$ and ${\text{XeO}}_3(+6)$
   3. C.${\text{XeO}}_2{\text{F}}_2(+6)$ and ${\text{XeO}}_2(+4)$
   4. D.${\text{XeOF}}_4(+6)$ and ${\text{XeO}}_2{\text{F}}_2(+6)$
   Show answer

   Answer: D

5. Q632018 · 8 Apr 2018 · Shift 1

   Which of the following compounds contain(s) no covalent bond(s)? $\text{KCl},{\text{PH}}_3,{\text{O}}_2,{\text{B}}_2{\text{H}}_6,{\text{H}}_2{\text{SO}}_4$

   1. A.$\text{KCl},{\text{B}}_2{\text{H}}_6$
   2. B.$\text{KCl},{\text{B}}_2{\text{H}}_6,{\text{PH}}_3$
   3. C.$\text{KCl},{\text{H}}_2{\text{SO}}_4$
   4. D.$\text{KCl}$
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   Answer: D

6. Q682018 · 8 Apr 2018 · Shift 1

   An aqueous solution contains an unknown concentration of ${\text{Ba}}^{2+}$. When 50 mL of a 1 M solution of ${\text{Na}}_2{\text{SO}}_4$ is added, ${\text{BaSO}}_4$ just begins to precipitate. The final volume is 500 mL. The solubility product of ${\text{BaSO}}_4$ is $1\times 10^{-10}$. What is the original concentration of ${\text{Ba}}^{2+}$?

   1. A.$1.0\times 10^{-10}\text{M}$
   2. B.$5\times 10^{-9}\text{M}$
   3. C.$2\times 10^{-9}\text{M}$
   4. D.$1.1\times 10^{-9}\text{M}$
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   Answer: D

7. Q692018 · 8 Apr 2018 · Shift 1

   An aqueous solution contains $0.10\text{M}{\text{H}}_2\text{S}$ and $0.20\text{M}\text{HCl}$. If the equilibrium constants for the formation of ${\text{HS}}^{-}$ from ${\text{H}}_2\text{S}$ is $1.0\times 10^{-7}$ and that of ${\text{S}}^{2-}$ from ${\text{HS}}^{-}$ ions is $1.2\times 10^{-13}$ then the concentration of ${\text{S}}^{2-}$ ions in aqueous solution is :

   1. A.$5\times 10^{-19}$
   2. B.$5\times 10^{-8}$
   3. C.$3\times 10^{-20}$
   4. D.$6\times 10^{-21}$
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   Answer: C

8. Q702018 · 8 Apr 2018 · Shift 1

   Which of the following are Lewis acids?

   1. A.${\text{BCl}}_3$ and ${\text{AlCl}}_3$
   2. B.${\text{PH}}_3$ and ${\text{BCl}}_3$
   3. C.${\text{AlCl}}_3$ and ${\text{SiCl}}_4$
   4. D.${\text{PH}}_3$ and ${\text{SiCl}}_4$
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   Answer: A

9. Q862018 · 8 Apr 2018 · Shift 1

   An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

   1. A.Base: Weak, Acid: Strong, End point: Colourless to pink
   2. B.Base: Strong, Acid: Strong, End point: Pinkish red to yellow
   3. C.Base: Weak, Acid: Strong, End point: Yellow to pinkish red
   4. D.Base: Strong, Acid: Strong, End point: Pink to colourless
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   Answer: C