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Chemistry | Punjab Board | Grade 12 | 2018
Q. How is benzamide converted into benzylamine?
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Q. When HgI2 is added to aqueous solution of KI, why there is an increase in vapour pressure of solution ?
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Q. How much amount of substance is deposited by passing one Faraday of electricity?
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Q. Write two structure differences between DNA and RNA.
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Q. Why does acetylation of NH2 group of aniline reduce its activity ?
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Q. Why phenols are acidic in nature ?
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Q. Why do transition metals have high enthalpies of atomization?
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Q. What are Etard Reaction and Gattermann Koch Reaction ? Give one example of each.
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Q. Analysis shows nickel oxide has the formula Ni0.98O1.00. What fraction of Ni exists as Ni2+ and Ni3+ ions in given oxide?
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Q. Explain SN1 mechanism with an example.
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Q. Predict the products in the following reaction.
1511647_8a54baeeb8374496baddff0cf082a4a2.png
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Q. Aldehydes are more reactive toward nucleophillic addition reactions than ketones. Justify.
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Q. Calculate the cell potential (Ecell) of the following cell at 298K.
Ag(s)|AgNO3(0.01M)||AgNO3(1.0M)|Ag(s)
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Q. In a metallic oxide, oxide ions are arranged in cubic close packing. One sixth of the tetrahedral voids are occupied by cations P and one third of octahedral voids are occupied by the cation Q. Deduce the formula of the compound.
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Q. What are biodegradable polymers ? Give chemical equation for the preparation of any one biodegradable polymer.
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Q. Explain metal deficiency defect due to cation vacancies.
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Q. For a reaction rate law expression is:
Rate =K[A]1/2[B]2
Can this reaction be an elementary? Explain.
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Q. Explain normal or standard hydrogen electrode.
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Q. Explain the mechanism of the following reaction.
C2H5OHConc.H2SO4−−−−−−−443KCH2=CH2+H2O
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Q. Give two differences between macromolecular colloids and associated colloids.
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Q. What is Tollen's reagent ?
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Q. Explain the term dialysis. How can it be increased ?
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Q. What are the units of rate constant for the first order reaction?
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Q. What are Claisen schmidt condensation and Kolbe's Reaction ? Give one example of each.
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Q. Why NCl3 and PCl3 are hydrolysed differently?
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Q. Why H3PO4 is triprotic acid but H3PO3 is diprotic acid?
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Q. Commercially available HCl contains 38% HCl by mass. Calculate molality of the solution.
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Q. Explain Mond's process used for refining of nickel.
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Q. Out of 1M urea solution and 1MKCl solution, which one has higher freezing point ?
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Q. [Fe(CN)6]3 is low spin complex but [Fe(H2O)6]+3 is high spin complex. Explain.
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