UP Board Class 12 Chemistry Question Paper with Answer Key Code 347 CA is available for download. The exam was conducted by the Uttar Pradesh Madhyamik Shiksha Parishad (UPMSP) on March 4, 2023 in Afternoon Session 2 PM to 5:15 PM. The medium of paper was English and Hindi. In terms of difficulty level, UP Board Class 12 Chemistry paper was Difficult. The question paper comprised a total of 7 questions.
UP Board Class 12 Chemistry (Code 347 CA) Question Paper with Solutions PDF (March 4)
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The solid which is electrical conductor, ductile and tensile, is called:
In a 200 g solution of glucose with 10% mass per cent, amount of glucose will be:
Velocity constant (k) for a reaction is \(2.3 \times 10^{-5} \, L \, mol^{-1} s^{-1}\). Order of the reaction will be:
The base not present in RNA is:
Cannizzaro’s reaction is exhibited by:
Carbylamine reaction gives:
Calculate the packing capacity (efficiency) of a simple cubic lattice.
The structure of a cell of an element is body-centred cubic (bcc). The length of the core of the cell is 200 pm. Density of the element is 7 g/cm\(^3\). Determine the number of atoms in 20 g element.
Give answers:
(i) Why does the conductivity of any solution decrease with dilution?
(ii) Conductivity of 0.20 M KCl solution at 298 K is 0.248 S cm\(^{-1}\). What will be its molar conductivity?
Initial concentration of N\(_2\)O\(_5\) in a first-order reaction was \(1.24 \times 10^{-2}\) mol L\(^{-1}\) at 310 K, which remained \(0.20 \times 10^{-2}\) mol L\(^{-1}\) after 30 minutes. Calculate velocity constant at 310 K. \((\log_{10} 6.2 = 0.7924)\)
Justify with reasons:
(i) Why does physical adsorption decrease on increasing temperature?
(ii) Why are powdered materials better effective adsorbents in comparison to their crystalline forms?
Explain the following:
(i) NCl\(_3\) occurs but NCl\(_5\) does not. Why?
(ii) Why are halogens strong oxidising agents?
What do you mean by bidentate and ambidentate ligands? Give one example of each.
Differentiate between the structures of D-glucose and D-fructose.
The resistance of a conductivity cell, filled with 0.1 mol L\(^{-1}\) KCl solution is 100 \(\Omega\). If the resistance of this cell is 500 \(\Omega\) on filling 0.02 mol L\(^{-1}\) KCl solution, then calculate the conductivity and molar conductivity of 0.02 mol L\(^{-1}\) KCl solution. The conductivity of 0.1 mol L\(^{-1}\) KCl solution is 1.29 S m\(^{-1}\).
Differentiate between the following:
(i) True solution and suspension
(ii) Lyophilic and Lyophobic colloid
(iii) Multimolecular and Macromolecular colloid
Write short notes on the following:
(i) Secondary structure of proteins
(ii) Peptide bond
(iii) Monosaccharides
Give reasons of the following:
(i) Aniline does not exhibit Friedel–Crafts reaction.
(ii) Ethyl amine is soluble in water while aniline is not.
What do you understand by osmosis and osmotic pressure?
1.26 g protein is present in 200 cm\(^3\) aqueous solution of protein. Molar mass of protein is 61,022 g mol\(^{-1}\). What will be osmotic pressure of this solution at 300 K?
(i) What do you understand by velocity of a chemical reaction?
(ii) Explain Raoult’s law.
Explain the following with reasons:
(i) Transition metals generally form coloured compounds.
(ii) Transition metals and their maximum compounds are paramagnetic.
Write IUPAC names of the following coordination compounds:
(i) [CrCl\(_2\)(en)\(_2\)]Cl
(ii) Cs[FeCl\(_4\)]
(iii) K\(_3\)[Co(C\(_2\)O\(_4\))\(_3\)]
(iv) [CoCl\(_3\)(NH\(_3\))\(_3\)]
Describe the industrial manufacture of sulphur dioxide gas. Give also chemical equations of the reactions. Give chemical equations of the reactions of sulphuric acid with calcium fluoride, copper and sulphur.
What happens when (Give chemical equations only):
(i) Iodine reacts with nitric acid solution?
(ii) Chlorine reacts with sulphur dioxide?
(iii) Chlorine reacts with hot and conc. NaOH solution?
(iv) Chlorine reacts with fluorine?
(v) Zinc reacts with dil. nitric acid?
Write structures of the following compounds:
(i) 2-chloro-3-methylpentane
(ii) 1,4-dibromobut-2-ene
(iii) 1-chloro-2-methylbenzene
(iv) 1-chloro-4-ethylcyclohexane
(v) 3-bromo-2-methylbut-2-ene
What happens when (Give chemical equations only):
(i) n-butyl chloride reacts with alcoholic KOH?
(ii) Methyl iodide reacts with magnesium in presence of dry ether?
(iii) Methyl bromide reacts with sodium in presence of dry ether?
(iv) Methyl iodide reacts with KCN solution?
(v) Chlorobenzene reacts with aqueous NaOH?
Describe the industrial manufacture of ethanol. Give also the chemical equation of reactions. What is formed after dehydrogenation of ethanol? Write the mechanism of acidic dehydration of ethanol to get ethene.
Complete the following reactions and write the names and formulae of A, B, C, D, E, F:
(i) \[ Phenol (OH group) \xrightarrow{conc. HNO_3} A \]
(ii) \[ Phenol \xrightarrow{CHCl_3 + aq.NaOH} B \]
(iii) \[ CH_3-CH_2-CH_2-O-C(CH_3)_2-CH_2-CH_3 \xrightarrow{HI, \Delta} C + D \]
(iv) \[ CH_3CH(OH)CH_3 \xrightarrow{CrO_3} E \]
(v) \[ CH_3COOH \xrightarrow{(i) LiAlH_4 \, (ii) H_2O} F \]
An organic compound ‘A’ having molecular formula C\(_8\)H\(_8\)O, gives orange-red precipitate with 2,4-DNP (2,4-Dinitrophenylhydrazine) reagent. ‘A’ gives yellow precipitate on heating with iodine in presence of NaOH. ‘A’ neither reduces Tollen’s reagent, Fehling’s solution nor decolourises bromine water. It forms a carboxylic acid ‘B’ having molecular formula C\(_7\)H\(_6\)O\(_2\), on strong oxidation with chromic acid. Identify compounds ‘A’ and ‘B’ and explain the main reactions.
How will you obtain (Give chemical equations only):
(i) 4-hydroxy-4-methylpentan-2-one from propanone?
(ii) 3-hydroxybutanol from ethanol?
(iii) Butanoic acid from butanal?
(iv) Ethanoic anhydride from ethanoic acid?
(v) Phenyl ethanoic acid from benzyl alcohol?
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