Surface Chemistry & Solid State · JEE Main previous year questions

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2021 13 questions

Q762021 · 26 Aug 2021 · Shift 2
The sol given below with negatively charged colloidal particles is :
1. A. $FeC l_{3}$ added to hot water
2. B. $KI$ added to $AgN O_{3}$ solution
3. C. $AgN O_{3}$ added to $KI$ solution
4. D. $A l_{2} O_{3} \cdot x H_{2} O$ in water
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Answer: C
Q762021 · 25 Jul 2021 · Shift 1
Sodium stearate $C H_{3} (C H_{2})_{16} CO O^{-} N a^{+}$ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following :
1. A.It forms spherical micelles with $C H_{3} (C H_{2})_{16}$ - group pointing towards the centre of sphere.
2. B.It forms non-spherical micelles with $- CO O^{-}$ group pointing outwards on the surface.
3. C.It forms spherical micelles with $C H_{3} (C H_{2})_{16}$ - group pointing outwards on the surface of sphere
4. D.It forms non-spherical micelles with $C H_{3} (C H_{2})_{16}$ - group pointing towards the centre.
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Answer: A
Q802021 · 25 Jul 2021 · Shift 2
Match List I with List II : $List-I Example of colloids (a) Cheese (b) Pumice stone (c) Hair cream (d) Cloud List - II Classification (i) dispersion of liquid in liquid (ii) dispersion of liquid in gas (iii) dispersion of gas in solid (iv) dispersion of liquid in solid$ Choose the most appropriate answer from the options given below
1. A.(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. B.(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
3. C.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
4. D.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
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Answer: D
Q902021 · 22 Jul 2021 · Shift 2· Numerical answer
A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be $7.62 g c m^{- 3}$ . The molar mass of copper complex is ____ $g mo l^{- 1}$ . (Nearest integer) [Given : $N_{A} = 6.022 \times 1 0^{23} mo l^{- 1}$ ]
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Answer: 106
Q802021 · 20 Jul 2021 · Shift 1
The conditions given below are in the context of observing Tyndall effect in colloidal solutions : (A) The diameter of the colloidal particles is comparable to the wavelength of light used. (B) The diameter of the colloidal particles is much smaller than the wavelength of light used. (C) The diameter of the colloidal particles is much larger than the wavelength of light used. (D) The refractive indices of the dispersed phase and the dispersion medium are comparable. (E) The dispersed phase has a very different refractive index from the dispersion medium. Choose the most appropriate conditions from the options given below :
1. A.(A) and (E) only
2. B.(C) and (D) only
3. C.(A) and (D) only
4. D.(B) and (E) only
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Answer: A
Q792021 · 18 Mar 2021 · Shift 1
In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is :
1. A. $M_{2} A_{3}$
2. B. $M_{4} A_{3}$
3. C. $M_{4} A$
4. D. $M A_{3}$
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Answer: B
Q752021 · 18 Mar 2021 · Shift 2
The charges on the colloidal $CdS$ sol and $Ti O_{2}$ sol are, respectively :
1. A.positive and positive
2. B.positive and negative
3. C.negative and negative
4. D.negative and positive
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Answer: D
Q702021 · 16 Mar 2021 · Shift 1
Which of the following is Lindlar catalyst?
1. A.Partially deactivated palladised charcoal
2. B.Zinc chloride and $HCl$
3. C.Sodium and Liquid $N H_{3}$
4. D.Cold dilute solution of $KMn O_{4}$
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Answer: A
Q902021 · 16 Mar 2021 · Shift 1· Numerical answer
A certain element crystallises in a bcc lattice of unit cell edge length $27 \overset{˚}{A}$ . If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cell in $\overset{˚}{A}$ will be _______. (Round off to the Nearest Integer). [Assume each lattice point has a single atom] [Assume $3 = 1.73$ , $2 = 1.41$ ]
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Answer: 33
Q792021 · 26 Feb 2021 · Shift 2
The nature of charge on resulting colloidal particles when $FeC l_{3}$ is added to excess of hot water is :
1. A.neutral
2. B.sometimes positive and sometimes negative
3. C.positive
4. D.negative
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Answer: C
Q902021 · 26 Feb 2021 · Shift 2· Numerical answer
The number of octahedral voids per lattice site in a lattice is _________. (Rounded off to the nearest integer)
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Answer: 1
Q772021 · 25 Feb 2021 · Shift 2
Given below are two statements : Statement I : $α$ and $β$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. In the light of the above statements, choose the correct answer from the options given below :
1. A.Statement I is true but Statement II is false.
2. B.Statement I is false but Statement II is true.
3. C.Both Statement I and Statement II are true.
4. D.Both Statement I and Statement II are false.
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Answer: A
Q902021 · 25 Feb 2021 · Shift 2· Numerical answer
The unit cell of copper corresponds to a face centered cube of edge length $3.596 \overset{˚}{A}$ with one copper atom at each lattice point. The calculated density of copper in $kg/ m^{3}$ is ____. [Molar mass of $Cu : 63.54 g$ ; Avogadro Number $= 6.022 \times 1 0^{23}$ ]
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Answer: 9077