UP Board Class 12 Chemistry Question Paper 2025 PDF (Code 347 JZ) is available for download here. The Mathematics exam was conducted on March 8, 2025 in the Morning Shift from 2:00 PM to 5:15 PM. The total marks for the theory paper are 100. Students reported the paper to be easy to moderate.
UP Board Class 12 Chemistry Question Paper 2025 (Code 347 JZ) with Solutions
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UP Board Class 12 Chemistry Questions with Solutions
Give an example of such solid solution in which solute is gas.
Magnetic moment of a bivalent ion in aqueous solution will be, if its atomic number is 25:
How many ions will be generated from the solution of the complex \( [Co(NH_3)_6]Cl_2 \)?
Reagent, which do not react with acetone and benzaldehyde:
Sweetest sugar is:
The correct IUPAC name for \( CH_2 = CHCH_2NHCH_3 \) is:
Calculate molality of a solution of 5.0 g of ethanoic acid (CH_3COOH) in 150.0 g of benzene.
Why is there always a decreasing tendency of solubility of gases in liquid on rising temperature?
How many oxidation states are exhibited by lanthanides?
Show the geometrical isomers of \([Fe(NH_3)_2(CN)_4]\).
Explain the following reactions with suitable chemical equations:
(i) Wurtz reaction
(ii) Wurtz-Fittig reaction
Alcohols are more soluble in water in comparison to hydrocarbons of comparable molecular weight. Explain.
Differentiate between the following:
(i) Propanal and Propanone,
(ii) Phenol and Benzoic acid.
Give the name of two water-soluble vitamins and diseases due to deficiency of them.
Explain Raoult's Law. The vapour pressure of chloroform (\( CHCl_3 \)) and dichloromethane (\( CH_2Cl_2 \)) are 200 mm Hg and 4.5 mm Hg respectively at 298 K.
Calculate the vapour pressure of the solution formed by mixing 51 g of \( CHCl_3 \) and 20 g of \( CH_2Cl_2 \) at 298 K.
The resistance of a column formed by a 0.10 mol L^{-1 concentrated solution is 6.5 × 10^3 ohm. Its diameter is 1 cm and length is 50 cm. Calculate its resistivity, conductivity and molar conductivity.
Explain with reason:
(i) Cr^{2+ is a reducing agent while Mn^{3+ is an oxidising agent, while both have \(d^4\) configuration.
Why metals show their maximum oxidation states in oxides and fluorides?
Transition metals generally form coloured compounds.
What do you understand by order of a reaction? Calculate the total order of those reactions which have velocity equations:
(i) Velocity \( = K[A]^{1/2}[B]^{3/2} \)
(ii) Velocity \( = K[A]^3[B]^{-1} \)
Explain Kohlrausch Law. Limiting molar conductances (\( \lambda^0 \)) of \( Ca^{2+} \) and \( Cl^- \) ions in water at 298 K are 119.0 S cm\(^2\) mol\(^{-1}\) and 76.3 S cm\(^2\) mol\(^{-1}\) respectively. Calculate \( \lambda^0_m \) of \( CaCl_2 \).
Why do the conductivity of a solution decreases with dilution? Explain with reason.
In \( 2A \rightarrow \) Product, the reaction concentration of A remains 0.4 mol\(^{-1}\) from 0.5 mol\(^{-1}\) in 10 minutes.
Calculate the velocity of reaction for this period of time.
Differentiate between:
(x) Order of a reaction and molecularity
(y) Average and instantaneous velocity
Write IUPAC name of the following complexes:
Write the oxidation states, distribution of d-orbitals and coordination number of central metal of following complexes:
Write important structural and functional differences between DNA and RNA.
Write structural formula and IUPAC name of the following:
(i) sec-butyl chloride
(ii) isopentyl bromide
(iii) tert-butyl chloride
(iv) isobutyl chloride
(v) neopentyl chloride
Haloalkanes give nucleophilic substitution reactions while haloarenes give electrophilic substitution reactions.
Hydrogen atom of chloroform is acidic in nature.
Potassium cyanide gives alkyl cyanide on reaction with haloalkanes (R-X) while silver cyanide forms an isocyanide as main product.
How can these conversions be done? Give chemical equations only.
(i) Propan-2-ol from propene
(ii) Benzyl alcohol from benzyl chloride
(iii) Propan-1-ol from ethyl magnesium chloride
(iv) 2-methyl propan-2-ol from methyl magnesium bromide
(v) Picric acid from phenol
How will you synthesize the following? Give chemical equations only.
(i) 1-phenylethanol from a suitable alkene
(ii) Cyclohexylmethanol with the help of alkyl halide by \( S_N2 \) reaction.
(iii) Pentan-1-ol from a suitable alkyl halide.
What do you understand by these following terms? Give one example of each.
(i) Aldol
(ii) Schiff's base
(iii) Cannizaro's reaction
(iv) Oxime
(v) Acetal
Write the structure of the product for the reaction:
\[ C_6H_6 + C_2H_5Cl \xrightarrow{Anhydrous AlCl_3} C_6H_5C_2H_5 \]
Write the structure of the product for the reaction:
\[ C_6H_5C_2H_5 + Cd \xrightarrow{} 2C_2H_5COCl \]
Write the structure of the product for the reaction:
\[ CH_3C \equiv CH \xrightarrow{Hg^{2+}, H_2SO_4} CH_3C(OH)CH_3 \]
Write the structure of the product for the reaction:
\[ C_6H_5CH_3 \xrightarrow{CrO_2Cl_2} C_6H_5CHO \]
Write the structure of the product for the reaction:
\[ C_6H_5COOH + CH_3CH_2NH_2 \xrightarrow{H^+} C_6H_5CH_2NH_2 \]
Write the following in order:
(i) Decreasing order of \( pK_b \) value: \( C_2H_5NH_2, C_6H_5NHCH_3, C_2H_5NH_2 \).
(ii) Decreasing order of basic strength: \( C_6H_5NH_2, C_6H_5N(CH_3)_2, C_6H_5NH_2 \).
(iii) Increasing order of basic strength: Aniline; p-nitroaniline; and paratoludine.
(iv) Solubility order in water: \( C_6H_5NH_2, (C_2H_5)_2NH, C_2H_5NH_2 \).
(v) Increasing order of boiling point: \( C_2H_5OH, CH_3NH_2, C_2H_5NH_2 \).
Aniline does not show Friedel-Crafts reaction.
Gabriel-Pthalimide synthesis is given priority in the synthesis of primary amines.
Methyl amine gives precipitate of hydrated ferric oxide on reaction with ferric chloride in water.
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