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Which has the highest freezing point?
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Which of the following statement is correct:
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Ozone is a/an _______ molecule and the two O-O bond lengths in ozone are (i) _______-and (ii) _________.
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Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): Cryoscopic constant depends on nature of solvent.
Reason (R): Cryoscopic constant is a universal constant.
Select the most appropriate answer from the options given below:
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Which of the following statements is false?
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How does sprinkling of salt help in clearing the snow covered roads in hilly areas? Explain the phenomenon involved in the process.
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Assertion: When NaCl is added to water a depression in freezing point is observed.
Reason: The lowering of vapour pressure of a solution causes depression in the freezing point.
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What advantage do the fuel cells have over primary and secondary batteries?
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Match the items of Column I and Column II.
| Column I | Column II |
| (i) Lead storage battery | (a) maximum efficiency |
| (ii) Mercury cell | (b) prevented by galvanisation |
| (iii) Fuel cell | (c) gives steady potential |
| (iv) Rusting | (d) Pb is anode, PbO2 is cathode |
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Which of the following interface cannot be obtained?
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Method by which lyophobic sol can be protected?
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Which of the following colloids cannot be coagulated easily?
(i) Lyophobic colloids.
(ii) Irreversible colloids.
(iii) Reversible colloids.
(iv) Lyophilic colloids.
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What happens when gelatin is mixed with gold sol?
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Match the items given in Column I and Column II.
| Column I | Column II |
| (i) Protective colloid | (a) \[\ce{FeCl3 + NaOH}\] |
| (ii) Liquid-liquid colloid | (b) Lyophilic colloids |
| (iii) Positively charged colloid | (c) Emulsion |
| (iv) Negatively charged colloid | (d) \[\ce{FeCl3}\] + hot water |
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A number of elements are available in earth’s crust but most abundant elements are ______.
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Explain why ozone is thermodynamically less stable than oxygen.
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Assertion: Hydrolysis of (–)-2-bromooctane proceeds with inversion of configuration.
Reason: This reaction proceeds through the formation of a carbocation.
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Methylamine reacts with \[\ce{HNO2}\] to form ______.
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Which of the following species are involved in the carbylamine test?
(i) \[\ce{R - NC}\]
(ii) \[\ce{CHCl3}\]
(iii) \[\ce{COCl2}\]
(iv) \[\ce{NaNO2 + HCl}\]
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Proteins are found to have two different types of secondary structures viz. α-helix and β-pleated sheet structure. α-helix structure of protein is stabilised by:
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