On this page we have uploaded UBSE Intermediate Class 12 Question Paper for Chemistry released by ubse.uk.gov.in. The question paper provided here from Uttarakhand State Board. Download the 2023 question paper pdf as well.
Uttarakhand State Board has published subject wise question paper for this year Class 12 students in its official portal ubse.uk.gov.in. Here we have published Class 12 UBSE question paper 2023 for Chemistry subject. For more information regarding Uttarakhand Intermediate Class 12, 2023 Exam Date, Exam Pattern, Time, Date, How to prepare follow our website.
Uttarakhand Board (UBSE) Intermediate Class 12 Question Papers – Chemistry Subject
(1) (a) In the following the Lyophilic colloid is-
(i) Milk
(ii) Gum
(iii) Blood
(iv) None of these
(b) Penicillin is an-
(i) Antibiotic
(ii) Antipyretic
(iii) Antiseptic
(iv) Analgesic
(c) Deficiency of which vitamin causes nightblindness disease?
(i) Vitamin A
(ii) Vitamin B
(iii) Vitamin C
(iv) Vitamin D
(d) Glucose is converted into Ethyl Alcohol by-
(i) Invertase
(ii) Zymase
(iii) Maltase
(iv) Amylase
(e) Which of the following reduces Fehling solution?
(i) Acetic Acid
(ii) Benzoic Acid
(iii) Oxalic Acid
(iv) Formic Acid
(f) The impurities present in the ore is called-
(i) Slag
(ii) Flux
(iii) Gangue
(iv) None of these
(g) The monomer of Nylon-6 is-
(i) Ethylene
(ii) Propene
(iii) Styrene
(iv) Caprolactum
(h) A Molal solution is one that contains one Mole of a solute in-
(i) 1000 gram of the solvent
(iii) One litre of the solvent
(ii) One litre of the solution
(iv) 22.4 litres of the solution
(iv) None of these
Fill in the blank:
(2) The solubility of a gas in a liquid is directly proportional to the……….. of the gas.
(3) Write the molecularity of reaction 2HI→ H₂+ I₂
(4) Why does O3 act as a powerful oxidising agent?
(5) What is the Oxidation number of Fe in K4 [Fe(CN)6]?
(6) Write chemical reaction of Aldol Condensation.
(7) How chlorobenzene is prepared from Benzene Diazonium Chloride? Write chemical reaction only.
(8) Differentiate between Schottky defect and Frenkel defect.
(9) Explain simple cubic, body centred cubic and face centred cubic unit cells and find the total number of atoms per unit cell of each.
Or
An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm³. How many atoms are present in 208 g of this element?
(10) Write short notes on the following-
(i) Froth floatation Method
(ii) Flux
(11) State the Faraday’s Laws of electrolysis.
(12) Explain homopolymer and copolymer each with an example.
(13) [NiCL4]-2 is paramagnetic, while [Ni(CO4] is diamagnetic, though both are tetrahedral. Why?
Or
Explain the following each with an example-
(i) Geometrical Isomerism
(ii) Optical Isomerism
(14) Write down the electronic configuration of the following-
(i) Cr+3
(ii) Cu+
(15) Why Chlorine atom present in Chlorobenzene is less reactive than Chlorine atom present in Ethyl Chloride?
(16) Differentiate between Soap and Synthetic Detergents.
(17) Write down the mechanism of the following chemical reaction-
(18) Define the following terms-
(i) Normality
(ii) Molarity
(iii) Molar fraction
Or
4 gm of caustic soda (molar mass 40 ) is dissolved in water to prepare 200gm of solution. Calculate the molality of the solution and molar fraction of the solute.
(19) Explain the following with reason-
(a) Lanthanoid Contraction
(b) d-block elements form coloured ions.
(20) Explain the following with reason-
(a) Coagulation
(b) Tyndal Effect
(c) Dialysis
(21) What happens when (Write chemical equation only)-
(a) Ethyl Alcohol is treated with Iodine in presence of Alkali.
(b) Chloroform is heated with the solution of Phenol and Sodium Hydroxide.
(c) Ethyl Alcohol is heated with Acetic Acid’.
(22) Describe any one method for the identification of primary, secondary and tertiary amines. Write the chemical equations also for the reactions involved.
(23) Explain with reason how the following properties of p-block elements trend while moving from left to right in a period-
(a) Atomic radius
(b) Ionisation energy
(c) Electronegativity
Or
Give reasons of the following-
(i) H2O is liquid while H2S is gas.
(ii) Phosphorus forms PCl5 while Nitrogen does not forms NCl5.
(iii) The size of Cl– ion is greater than the size of Cl atom.
(24) (i) Differentiate between nucleosides and nucleotides.
(ii) Give one difference between DNA and RNA.
(25) (i) State Kohlraush’s Law.
(ii) Calculate the electromotive force (e. m. f) of the following cell at 25°C- Zn|Zn+2 (0.01M) ‖ Ag+(1.0M)|Ag
E°cell = 1.56V (at 25°C)
Or
(a) Write the Nernst Equation.
(b) Write cell reactions for the following cells-
(i) Fe|Fe+2||H2SO4|H2 (Pt)
(ii) (Pt) H2|HCL|| Cl2 (Pt)
(26) (a) Derive the integrated rate equation for the first order reaction.
(b) A first order reaction has rate constant 2.31 x10-5 sec-1, Calculate the half-life of the reaction.
Or
(a) Prove that the time required for 99% completion of a first order reaction is twice the time required for the completion of 90% reaction.
(b) Write Collision Theory of Chemical Reactions.
(27) Describe Contact method for the manufacture of Sulphuric acid with labelled diagram and write the chemical reactions involved. Give two uses of Sulphuric acid also.
Or
(a) Describe Haber’s process for the manufacture of Ammonia with diagram and write the chemical reactions involved during the process.
(b) What happens when copper is treated with hot concentrated Sulphuric acid.
(28) (a) An organic compound A (molecular formula C3H6O) does not react with Tollen’s reagent but on reduction gives compound B (C3H80). Compound B, on treatment with HBr, gives Bromide C, which on treatment with alcoholic KOH gives Alkene D (C3H6). Identify compounds A, B, C and D with essential chemical reactions.
(b) Write down the Gattermann-Koch reaction with chemical equation.
Or
In following chemical equations, write down the products obtained with their names and chemical formulae in the blank spaces –
(a)
(b)
(c)
(d)