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In which pair is most efficient packing is present?
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\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by ______.
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Identify the law which is stated as:
“For any solution, the partial vapour pressure of each volatile component in the solution is directly proportional to its mole fraction.”
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Which of the following isomer has the highest melting point?
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Metal M ions form accp structure. Oxide ions occupy `1/2` octahedral and `1/2` tetrahedral voids. What is the formula of the oxide?
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Identify the secondary alcohols from the following set:
- \[\ce{CH3CH2CH(OH)CH3}\]
- \[\ce{(C2H5)3COH}\]
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Assertion: The packing efficiency is maximum for the fcc structure.
Reason: The cordination number is 12 in fcc structures.
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Match the laws given in Column I with expresions given in Column II.
| Column I | Column II |
| (i) Raoult's law | (a) `ΔT_f = K_fm` |
| (ii) Henry's law | (b) π = CRT |
| (iii) Elevation of boiling point | (c) `p = x_1p_1^0 + x_2p_2^0` |
| (iv) Depression in freezing point | (d) `ΔT_b = K_bm` |
| (v) Osmotic pressure | (e) `p = K_H.x` |
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The cell constant of a conductivity cell ______.
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Conductivity of an electrolytic solution depends on:
(i) nature of electrolyte.
(ii) concentration of electrolyte.
(iii) power of AC source.
(iv) distance between the electrodes.
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ConductivityK, is equal to:
(i) `1/R l/A`
(ii) `G^∗/R`
(iii) Λm
(iv) `l/A`
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In an aqueous solution how does specific conductivity of electrolytes change with addition of water?
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Assertion: Conductivity of all electrolytes decreases on dilution.
Reason: On dilution number of ions per unit volume decreases.
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Assertion: For measuring resistance of an ionic solution an AC source is used.
Reason: Concentration of ionic solution will change if DC source is used.
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For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?
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Match the items of Column I and Column II.
| Column I | Column II | |
| (i) | Diamond | (a) short interval of time |
| (ii) | Instantaneous rate | (b) ordinarily rate of conversion is imperceptible |
| (iii) | Average rate | (c) long duration of time |
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Match the items of Column I and Column II.
| Column I | Column II | |
| (i) | Mathematical expression for rate of reaction | (a) rate constant |
| (ii) | Rate of reaction for zero order reaction is equal to | (b) rate law |
| (iii) | Units of rate constant for zero order reaction is same as that of | (c) order of slowest step |
| (iv) | Order of a complex reaction is determined by | (d) rate of a reaction |
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Describe how does the enthalpy of reaction remain unchanged when a catalyst is used in the reaction.
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Which of the following process does not occur at the interface of phases?
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