Surface Chemistry & Solid State · JEE Main previous year questions

2024 7 questions

1. Q642024 · 8 Apr 2024 · Shift 1

   Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. $\mathrm{F}{\mathrm{e}}^{3+}$ oxidises the iodide ion B. $\mathrm{F}{\mathrm{e}}^{3+}$ oxidises the persulphate ion C. $\mathrm{F}{\mathrm{e}}^{2+}$ reduces the iodide ion D. $\mathrm{F}{\mathrm{e}}^{2+}$ reduces the persulphate ion Choose the most appropriate answer from the options given below:

   1. A.B and C only
   2. B.A only
   3. C.A and D only
   4. D.B only
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   Answer: C

2. Q662024 · 5 Apr 2024 · Shift 2

   While preparing crystals of Mohr's salt, dil ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ is added here to :

   1. A.prevent the hydrolysis of ferrous sulphate
   2. B.prevent the hydrolysis of ammonium sulphate
   3. C.increase the rate of formation of crystals
   4. D.make the medium strongly acidic
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   Answer: A

3. Q732024 · 5 Apr 2024 · Shift 2

   Coagulation of egg, on heating is because of :

   1. A.Denaturation of protein occurs
   2. B.Biological property of protein remains unchanged
   3. C.Breaking of the peptide linkage in the primary structure of protein occurs
   4. D.The secondary structure of protein remains unchanged
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   Answer: A

4. Q792024 · 4 Apr 2024 · Shift 2

   The adsorbent used in adsorption chromatography is/are - A. silica gel B. alumina C. quick lime D. magnesia Choose the most appropriate answer from the options given below :

   1. A.C and D only
   2. B.A only
   3. C.B only
   4. D.A and B only
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   Answer: D

5. Q772024 · 31 Jan 2024 · Shift 1

   'Adsorption' principle is used for which of the following purification method?

   1. A.Chromatography
   2. B.Sublimation
   3. C.Distillation
   4. D.Extraction
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   Answer: A

6. Q722024 · 29 Jan 2024 · Shift 2

   Chromatographic technique/s based on the principle of differential adsorption is / are A. Column chromatography B. Thin layer chromatography C. Paper chromatography Choose the most appropriate answer from the options given below:

   1. A.B only
   2. B.A only
   3. C.A & B only
   4. D.C only
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   Answer: C

7. Q732024 · 27 Jan 2024 · Shift 1

   Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Melting point of Boron ($2453\text{ K}$) is unusually high in group 13 elements. Reason (R) : Solid Boron has very strong crystalline lattice. In the light of the above statements, choose the most appropriate answer from the options given below ;

   1. A.Both (A) and (R) are correct but (R) Is not the correct explanation of (A)
   2. B.Both (A) and (R) are correct and (R) is the correct explanation of (A)
   3. C.(A) is true but (R) is false
   4. D.(A) is false but (R) is true
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   Answer: B