Chemical & Ionic Equilibrium · JEE Main previous year questions

2017 4 questions

1. Q622017 · 9 Apr 2017 · Shift 1

   50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If $\mathrm{p}{\mathrm{K}}_{\mathrm{b}}$ of ammonia solution is 4.75, the pH of the mixture will be :

   1. A.$3.75$
   2. B.$4.75$
   3. C.$8.25$
   4. D.$9.25$
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   Answer: D

2. Q832017 · 9 Apr 2017 · Shift 1
   
   1. A.(I) < (II) < (IV) < (III)
   2. B.(I) < (II) < (III) < (IV)
   3. C.(II) < (I) < (IV) < (III)
   4. D.(II) < (I) < (III) < (IV)
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   Answer: C

3. Q872017 · 9 Apr 2017 · Shift 1

   $\mathrm{Xe}{\mathrm{F}}_6$ on partial hydrolysis with water produces a compound ‘X’. The same compound ‘X’ is formed when $\mathrm{Xe}{\mathrm{F}}_6$ reacts with silica. The compound ‘X’ is :

   1. A.$\mathrm{Xe}{\mathrm{F}}_2$
   2. B.$\mathrm{Xe}{\mathrm{F}}_4$
   3. C.$\mathrm{XeO}{\mathrm{F}}_4$
   4. D.$\mathrm{Xe}{\mathrm{O}}_3$
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   Answer: C

4. Q662017 · 8 Apr 2017 · Shift 1

   Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionisation constant of HA is $10^{-5}$, the ratio of salt to acid concentration in the buffer solution will be :

   1. A.$4:5$
   2. B.$1:10$
   3. C.$10:1$
   4. D.$5:4$
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   Answer: C