Which of the following statements are correct? (i) Smaller the gold number of lyophilic colloid, the larger will be its protective power. (ii) Lyophilic sols, in contrast to lyophobic sols can easily coagulate on addition of small amount of electrolyte. (iii) Ferric chloride solution is used to stop bleeding from a fresh cut because it coagulates the blood. (iv)The flocculation value of arsenious sulphide sol is independent of the charge of anion of the coagulating electrolyte.
A)
(i), (ii) and (iii)
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B)
(i), (iii) and (iv)
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C)
(ii), (iii) and (iv)
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D)
(i), (ii) and (iv)
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Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aqueous sodium hydroxide to furnish the corresponding hydroxyl derivative?
A)
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B)
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C)
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D)
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When vapours of X were gradually heated from \[25{}^\circ C\]at atmospheric pressure, the colour was found to deepen at first and then fades as the temperature was raised above \[{{160}^{o}}C\]. At \[{{600}^{o}}C\],the vapours were almost colourless, but the colour deepened When the pressure was raised at this temperature. Identify X.
A)
Bromine.
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B)
A mixture of nitrogen dioxide and dinitrogen tetroxide.
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C)
Pure nitrogen dioxide.
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D)
Pure dinitrogen tetroxide.
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Observe the given reactions : 1.\[FeC{{l}_{3}}\,\,\,Solution+Zn\to product\,\,X\] 2. \[FeC{{l}_{3}}\,\,\,Solution+{{H}_{2}}\,\,gas\to product\,\,Y\] \[FeC{{l}_{3}}\] solution gives blue colour with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\], hence
A)
X also gives blue colour with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
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B)
Y also gives blue colour with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
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C)
Both X and Y give blue colour with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
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D)
None gives colour with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\].
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The equivalent conductance at infinite dilution of an acid like HF
A)
Can be determined by extrapolation of measurements of dilute solutions of HCI, HBr and HI
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B)
Can be determined by measurement of very dilute HF solution
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C)
Can best be determined from measurements of concentrated solutions of NaF, NaCI and HCI
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D)
Can best be determined from measurements of dilute solutions of NaF, NaCI and HCI.
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Which has maximum percentage of Cl?
A)
PVC
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B)
BHC
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C)
Neoprene
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D)
DDT
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A mole of complex compound \[Co{{(N{{H}_{3}})}_{5}}C{{l}_{3}}\]gives 3 mole of ions, when dissolved in water. One mole of the same complex reacts with two moles of \[AgN{{O}_{3}}\] solution to form two moles of AgCI(s). The structure of complex is
A)
\[[Co{{(N{{H}_{3}})}_{5}}Cl]C{{l}_{2}}\]
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B)
\[[Co{{(N{{H}_{3}})}_{3}}C{{l}_{3}}].2N{{H}_{3}}\]
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C)
\[[Co{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]Cl.N{{H}_{3}}\]
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D)
\[[Co{{(N{{H}_{3}})}_{4}}Cl]C{{l}_{2}}.N{{H}_{3}}\]
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In a cubic lattice, each edge of the unit cell is 400 pm. Atomic weight of the element is 60 and its density is \[6.25g/c.c.\]Avogadro number\[=60\times \,{{10}^{23}}\]. The crystal lattice is
A)
Face-centred
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B)
Primitive
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C)
Body-centred
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D)
End-centred.
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The rate of change of concentration of P for reaction : \[P\to Q\,\,is\,\,given\,\,by\frac{-d[P]}{dt}=k{{[P]}^{1/3}}\] The half-life period of the reaction will be
A)
\[\frac{3{{[{{P}_{0}}]}^{2/3}}{{[{{(2)}^{2/3}}-1]}^{2}}}{{{(2)}^{5/3}}\,\,\,K}\]
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B)
\[\frac{\frac{3}{2}{{[{{P}_{0}}]}^{2/3}}[{{(2)}^{2/3}}-1]}{\,K}\]
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C)
\[\frac{3{{[{{P}_{0}}]}^{2/3}}[{{(2)}^{2/3}}-1]}{{{(2)}^{5/3}}\,\,\,K}\]
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D)
\[\frac{\frac{2}{3}{{[{{P}_{0}}]}^{3/2}}[{{(2)}^{2/3}}-1]}{\,K}\]
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At isoelectric point, solubility of amino acids in water is minimum because
A)
They are organic acids
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B)
Molecules show intramolecular hydrogen bonding
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C)
Concentration of cations and anions becomes equal
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D)
Concentration of zwitter ions is maximum.
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In the reduction of nitrobenzene into aniline, the intermediate is
A)
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B)
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C)
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D)
None of these.
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To a solution containing \[F{{e}^{3+}}\]and \[T{{i}^{4+}}\] ions when excess of NH40H is added, a ppt. (X) is produced. The ppt. (X) contains
A)
\[TiO.n{{H}_{2}}O\,\,\,\,and\,\,\,Fe\,\,{{\left( OH \right)}_{3}}\]
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B)
\[Ti{{O}_{2}}n{{H}_{2}}O\,\,\,\,nad\,\,\,Fe\,\,{{\left( OH \right)}_{3}}\]
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C)
\[Only\,\,Ti{{O}_{2}}.n{{H}_{2}}O\]
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D)
\[Only\,\,Fe{{\left( HO \right)}_{3}}\]
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Which is not the correct statement?
A)
Cassiterite, chromite and pitchblende are concentrated by hydraulic washing (Tabling).
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B)
Pure \[Al{{O}_{2}}\] is obtained from the bauxite ore by leaching in the Baeyer's process.
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C)
Sulphide ore is concentrated by calcination method.
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D)
Roasting can convert sulphide into oxide or sulphate and part of sulphide may also act as a reducing agent.
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