Class 12 CHEMISTRY Practice Set A :
Useful for Annual Exam 2023 issued by Directorate of Public Instruction
Class 10th and 12th board examinations are starting from 1st March. To help the students in their preparation, Directorate of Public Instruction Bhopal has issued practice paper sets for the preparation of annual examinations of 15 major subjects of class 12th, whose practice will help them in the preparation of annual examinations.
Note - Because in Madhya Pradesh, NCERT books are applicable in all subjects of class 12th, so this practice set is applicable for students of all states in India as well as abroad like America, England, Japan, Singapore, Australia, Saudi Arabia, France, etc. Useful for class 10th students also they can compare it with class 12th question paper of their country
CLASS – 12
TIME – 3 HOUR
SUBJECT – CHEMISTRY
set A M.MARK -70
INSTRUCTION:-
(i)- All questions are compulsory.
(ii). Question number 1 to 4 are objective type questions. Each question carries 1 × 7 = 7 marks. Total questions are 7 × 4 = 28.
(iii) Internal choices have been given in question numbers 5 to 19.
(iv) Answer question no. 5 to 12 in about 30 words each.
(v) Answer questions from question numbers 13 to 16 in about 75 words each.
(vi) Answer question no. 17 in about 120 words.
(vii) Answer questions from question no. 18 to 19 in about 150 words each.
(viii) Draw clear and labeled diagrams wherever necessary.
(ix) The marks allotted to each question are indicated against it.
Question 1 Choose the correct option – 7×1=7
1. The number of moles of solute present in 1000 grams of solvent is called -
(a) normality (b) molarity (c) molality (d) mole fraction
2. Value of 1 Faraday is -
(a) 96500 coulomb (b) 106 coulomb (c) 6.7 × 106 coulomb (d) 6.23×1023 coulomb
3. value of Molecularity is not correct -
(a) ½ (b) 1 (c) 2 (d) 3
4. In [Ni(CO)4] the oxidation number of Ni will be -
(a) zero (b) one (c) two (d) four
5. The following compound on heating with silver powder gives acetylene -
(a) CH2I2 (b) CH3I (c) CHI3 (d) CCI4
6. Mirbin oil is- (a) Aniline (b) Nitro benzene (b) Nitro aniline (d) Para amino azo benzene
7. Vitamin B1 is-
(A) Riboflavin (B) Cobalamin (C) Thiamine (D) pyridine Question
2. Fill in the blanks – 7×1=7
1. The rate of a chemical reaction is ………… of the concentration of the reactants.
2. Methyl amine is ……………… basic than ammonia.
3. Protein is a polymer of.................
4. The product of Sendmeyer’s reaction is …………….
5. When vapors of primary alcohol (in excess) are passed over hot alumina, .......... is formed.
6. carbyl Amin test gives only ………….. Amin .
7. Denaturation does not affect the ..................... structure of the protein.
Question 3 Make the correct pairs- 7×1 = 7
A B
(i) orange smoke a. Methyl isothiocyanate
(ii) Chlorophyll b. Copper, Silver
(iii) Carbonyl chloride c. magnesium
(iv) Copper metal d CrO2Cl2
(v) Neutral legend e. Zigler-Nata catalyst
(vi) Odor similar to mustard oil. f. CO
(vii) TiCl4+Al(C2H5)3 g. Phosphine gas
Question 4 Answer in one word/sentence- 7×1=7
1.Aamount of solute in grams in 106 parts of the solution is called?
2. What does the reaction in which oxidation and reduction occur simultaneously take place?
3.. What is the name of pentose fructose present in DNA.
4. The solution of ammoniacal silver nitrate is known as?
5. Calciferol is the chemical name of which vitamin?
6. Write the hybridization state of carbon in alcohol and phenol.
7. What is carbolic acid?
Q 5. What you understand by colligative properties. Explain. 2
OR
What is osmotic pressure?
Q 6. Write the first law of Faraday. 2
OR
define the specific conductivity.
Q 7. What israte of reaction? Explain. 2
OR
What do you understand by the half life period of reaction?
Q 8. Explain with examples what are complex compounds. 2
Or
What is Effective Atomic Number (EAN) explain with example.
Q 9. Write the IUPAC names of the following coordination compounds 2
(i) K4[Fe(CN)6] (ii) [Ag(NH3)2]
OR
Write the full name and structural formula of EDTA
Q 10. What happens when - (give the reaction) 2
reduction of formaldehyde.
OR
acetylene gas is passed over 1% HgSO4 and dil. H2SO4.
Q 11. Why is aliphatic amin more basic than ammonia? 2
OR
Explain Zwiter ion with example.
Q 12. Write two differences between DNA and RNA. 2
OR
Why vitamins B and C are not stored in our body?
Q 13. Prove that the relative lowering of vapor pressure is equal to the mole fraction of the solute. By Raoult's law. 3
OR
Find the mole fraction of both in a mixture of 72 grams of water and 92 grams of ethyl alcohol.
Q 14. Write three differences between the rate and molecularity of the reaction. 3
OR
Prove that the half-life period of a first-order reaction does not depend on the initial concentration of the reactant.
Q 15. Write the name, symbol and electronic configuration of the elements of the first transition series. 3
OR
Write the difference between lanthanide and actinide.
Q 16. Describe with the equation the oxidation or dehydrogenation method to distinguish between primary, secondary and tertiary alcohols. 3
OR
How will you obtain the following from phenol (a) 2,4,6 tri nitro phenol (b) Benzene (c) Ortho para crisol
Q 17. Explain the following reactions 4
(a) sand meyer reaction
(b) Hunsdieker reaction
(c) Wurtz fitting reaction
(d) Friedel shaft reaction
OR
What happens when – (a) ethyl chloride is treated with aqueous KOH
(b) chlorobenzene is heated with sodium metal in the presence of ether
(c) ethyl bromide is heated with alcoholic KOH
d) ethyl bromide is treated with silver nitrite.
Q 18.Explain with the application of Kohlrausch's law. 5 Find the molecular/molar conductance at infinite dilution of NH4OH with the help of the following data. ۸∞m(NH4Cl) = 129 Scm2mol-1
۸∞m(NaOH) = 248 Scm2mol-1۸∞m(NaCl) = 126 Scm2mol-1
OR
define and effect of dilution on specific conductance, equivalent conductance and molecular conductance Question
19. What happens when – 5
(a) acetic acid is treated with hydrazoic acid
(b) bezaldehyde is heated with NaOH
(c) benzaldehyde is heated with an alcoholic solution of KCN
(d) Acetyl chloride reacts with hydrogen gas in the presence of Pd and BaSO4.
(e) Acetic acid reacts with NH3.
OR
Explain the following reactions.
(a) Cannizaro reaction
(b) Aldol condensation
(c) Parkin reaction
(d) Rosemond reaction
(e) Reaction for formation of urotropine from formaldehyde
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