Download complete solution of RBSE 2024 Chemistry 12 paper
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Multiple Choice Questions[Section-A]
1.Write the answer of following MCQ in the given answer book
i) S I unit of conductivity is –
[A] S
[B] ohm
[C] S cm-1
[D] S m-1
- [D] S m-1
ii) Element showing highest number of oxidation state is-
[A] Mn
[B] Ni
[C] Fe
[D] Cr
[A] Mn
iii) oxidation state of Fe in [Fe(CO)5] is –
[A] 0
[B] 2
[C] 3
[D] 4
[A] 0
iv) The chemical formula of chromite ore is –
[A] MnO2
[B] Na2Cr2O4
[C] FeCr2O4
[D] Na2CrO4
[C] FeCr2O4
v) Number of mole of precipitated AgCl on adding excess silver nitrate solution in the solution of one mole CoCl3.5NH3 is –
[A] 1
[B] 2
[C] 3
[D] 5
[B] 2
vi) Metal present in Haemoglobin is –
[A] Mn
[B] Fe
[C] Co
[D] Ni
[B] Fe
vii) Ambidentate ligand is-
[A] Cl-1
[B] H2O
[C] NH3
[D] NO2–
[D] NO2–
viii) The compound obtained from meadow sweet is-
[A] Salicylaldehyde
[B] Cinnamaldehyde
[C] Valeraldehyde
[D] Vanilin
[A] Salicylaldehyde
ix) IUPAC Name of is
[A] Phthalic acid
[B] benzene-1,2-dioic acid
[C] Benzene-1,2-dicarboxylic acid
[D] Phenyl-1,2-dicarboxylic acid
[B] benzene-1,2-dioic acid
x) Change occurs in hybridization state of carbonyl carbon in nucleophilic addition reaction is-
[A] sp2 to sp
[B] sp to sp2
[C] sp2 to sp3
[D] sp3 to sp2
[C] sp2 to sp3
xi) The hybridization state of nitrogen in trimethylamine is –
[A] sp
[B] sp2
[C] sp3
[D] dsp3
[C] sp3
xii) The compound showing highest basic strength in aqueous solution is –
[A] (C2H5)3 N
[B] (C2H5)2 NH
[C] C2H5 NH2
[D] NH3
[B] (C2H5)2 NH
xiii) Secondary amine among the following is –
[A] propan-2-amine
[B] pentan-3-amine
[C] N-methylethanamine
[D] N, N-dimethylmethanamine
[C] N-methylethanamine
xiv) Globular protein is-
[A] Insulin
[B] Keratin
[C] Myosin
[D] Collagen
[A] Insulin
xv) Glucose is –
[A] aldopentose
[B] ketopentose
[C] aldohexose
[D] ketohexose
[C] aldohexose
xvi) Milk sugar is-
[A] Sucrose
[B] Lactose
[C] Maltose
[D] Galactose
[B] Lactose
Short Answer Type Question[Section-B]
Q2.Complete the fill in the blacks-
i) The unit of molarity is ——————-
Ans:-
mol/litre or molL-1
ii) The mathematical form of Henry’s law is —————
Ans:-
Pgas α Xgas
iii) The kinetic energy of maximum fraction of reactant molecules is called—————-
Ans:-
Most probable kinetic energy
iv) —————— and actinoids are called as inner transition elements.
Ans:-
Lanthanoids
v) —————— is coordination sphere in K4[Fe(CN)6]
Ans:-
[Fe(CN)6]4-
vi) In benzylic alcohols, -OH group is bonded with———— Hybridized carbon.
Ans:-
Sp3
vii) Glucose is converted to ethanol in the presence of ————— enzyme
Ans:-
Zymase
viii) Sodium benzoate is used as ——————————–
Ans:-
Preservative
ix) Deficiency of vitamin ————– causes Beri-Beri disease.
Ans:-
Vitamin- B1
x) The name of sugar present in RNA is —————–.
Ans:-
Ribose
Very short answer questions:
i) Define saturated solution.
Ans:-
It is the solution in which more solute can not be dissolved.
ii) Write names of solute and solvent present in sodium amalgam solution.
Ans:-
It is liquid in solid solution where Hg is solute and Na is solvent
iii) Rate = K [A]1/2 [B]1/2 . Calculate the order of reaction?
Ans:-
Order Of Reaction = ½ + ½ = 1
iv) Write directive influence of –OCH3 group present in anisole for electrophilic substitution reaction.
Ans:-
OCH3 group increases the electron density on ortho and para position in anisole.
v) Write chemical name of white precipitate obtained on the reaction of phenol with bromine water.
Ans:-
2,4,6-tribromo phenol
vi) Write chemical name of NH2-NHCONH2
Ans:-
semi carbazide
vii) Write name of the product obtained from the reaction between benzene diazonium chloride and phenol.
Ans:-
p-hydroxy azobenzene
viii) Write isocyanide test for primary amines.
Ans:-
R-NH2 + CHCl3 + KOH ——— R-NC + 3 KCl + 3 H2O
Short Answer type questions:
Q4. Calculate the mole fraction of gas A in the solution made on mixing 0.5 moles of gas A and 4.5 moles of gas B.
Q5) 0.05 moles of ethanoic acid is dissolved in 250 g benzene. Calculate the molality of the solution.
Q6)Draw the Daniel cell.
Q7) Rate constant of a first order is 1.386 x 10-14 S-1 . Calculate the half life of the reaction.
Q8) Write any three physical characteristics of interstitial compounds.
Q9) Why transition metals exhibit catalytic properties? Explain.
Q10) Despite being an electron withdrawing group, why Cl-group is ortho and para directing in electrophilic aromatic substitution? Give reason.
Q11) Write IUPAC name and chemical formula of [A] in above reaction.
Q12)Compound [X] is formed on heating ethanol with cnc.H2SO4 at 413 K temperature. Write IUPAC name of [X] and chemical equation involved.
Q13) Write chemical formula of [] and [] in the given reaction
Q14) Compare basic strength of aniline with ammonia.
Q15) Draw the double strand helix structure of DNA.
Long Answer Type Question[Section-C]
16. I) Define order of reaction.
ii) Explain pseudo first order reaction by giving appropriate example.
Or
i) Define molecularity of a reaction.
ii) Explain the role of activation energy in the feasibility of a chemical reaction.
Q17)Explain the geometry and magnetic nature of complex [Co(NH3)6]3+ on the basis of VBT.
Or
Explain the geometry and magnetic nature of complex [CoF6]3- on the basis of VBT.
Q18) Explain –
i) The boiling points of isomeric haloalkanes decrease with increase in branching.
ii) The melting points of p-isomer is higher than those of O-and m-isomers of isomeric dichlorobenzene.
iii) The racemic mixture of a optically active compound is always optically inactive
Or
Convert the following in single step-
i) Benzenediazoniumchloride to iodobenzene
ii) Chlorobenzene to diphenyl
iii) Chloroethane to ethane
Essay Type Question:
Q19- i) Describe the construction of standard hydrogen electrode.
ii) Write equation of cell reactions taking place at anode and cathode during use of dry cell.
Or
i) How does corrosion of iron occurs in presence of water and air? Describe.
ii) Write equation of cell reactions taking place at anode and cathode during use of mercury cell.
Q20- i) Write IUPAC name of an acid present in red-ant sting.
ii) Explain the Cannizzaro reaction by giving suitable chemical equation.
iii) Write chemical formula of [A] in the given reaction.
Or
i) ) Write IUPAC name of an acid present in vinegar.
ii) Explain the Rosenmund reaction by giving suitable chemical equation.
iii) Write chemical formula of [Z] in the given reaction.
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