You're viewing questions only. Log in as a Grade 12 student to reveal solutions for this paper.
Log In →
Q1
mcq
1 mark
Consider the following reaction : Zn(s) + Ag2O(s) + H2O(l) Zn2+(aq) + 2Ag(s) + 2OH–(aq) Given : Eo Ag+/Ag = 0.80 V Eo Zn2+/Zn = – 0.76 V 1 F = 96500 C mol–1 rGo for the above reaction is :
-
A.
– 301.080 kJ mol–1
-
B.
+ 310.080 kJ mol–1
-
C.
–326.070 kJ mol–1
-
D.
–375.060 kJ mol–1
Q2
mcq
1 mark
Identify the correct statement :
-
A.
Molecularity of a reaction is an experimental quantity.
-
B.
For complex reactions m
Q3
mcq
1 mark
The order for the given reaction is : A + 2B Products, Rate = k[A]½ [B]1
Q4
mcq
1 mark
Electronic configuration of chromium is :
-
A.
[Ar] 3d4 4s1
-
B.
[Ar] 3d4 4s2
-
C.
[Ar] 3d5 4s1
-
D.
[Ar] 3d5 4s2
Q5
mcq
1 mark
The correct IUPAC name of the complex [Pt(NH3)2Cl2] is :
-
A.
diamminedichloridoplatinum (IV)
-
B.
diamminedichloridoplatinum (II)
-
C.
dichloridodiammineplatinum (IV)
-
D.
dichloridodiammineplatinum (II)
Q6
mcq
1 mark
Which of the following is heteroleptic complex ?
-
A.
[Co(NH3)6]3+
-
B.
[Cr(NH3)6]3+
-
C.
[Ni(H2O)6]2+
-
D.
[Co(NH3)4Cl2]+
Q7
mcq
1 mark
Which of the following molecules is chiral in nature ?
-
A.
Propan–2–ol
-
B.
Butan–2–ol
-
C.
1–Bromobutane
-
D.
2–Bromopropane
Q8
mcq
1 mark
Identify the correct increasing order of boiling points of the given compounds :
-
A.
Propan–1– ol < butan–1–ol < butan –2–ol < pentan–1–ol
-
B.
Pentan–1– ol < butan–1–ol < butan –2–ol < Propan–1–ol
-
C.
Propan–1– ol < butan–2–ol < butan –1–ol < pentan–1–ol
-
D.
Butan–1– ol < Butan–2–ol < Propan –1–ol < Pentan–1–ol
Q9
mcq
1 mark
Identify the compound produced by the reduction of Ethanenitrile with Lithium aluminium hydride :
-
A.
Ethylamine
-
B.
Ethanal
-
C.
Propylamine
-
D.
Methylamine
Q10
mcq
1 mark
The base which is present in DNA but not in RNA is :
-
A.
Guanine
-
B.
Cytosine
-
C.
Thymine
-
D.
Adenine
Q11
mcq
1 mark
Proteins are polymers of -amino acids which are joined to each other by :
-
A.
Covalent Bond
-
B.
Peptide Bond
-
C.
Glycosidic Bond
-
D.
Coordinate Bond
Q12
mcq
1 mark
re joined to each other by :
-
A.
Covalent Bond
-
B.
Peptide Bond
-
C.
Glycosidic Bond
-
D.
Coordinate Bond
Q12
mcq
1 mark
Which of the following reactions is not explained by the open chain structure of glucose?
-
A.
Glucose on prolonged heating with HI forms n-hexane.
-
B.
Glucose reacts with hydroxylamine to form an oxime.
-
C.
Glucose gets oxidized to gluconic acid on reaction with bromine water.
-
D.
Glucose exists in two different crystalline forms, alpha (α) and beta (β).
Q13
short answer
1 mark
Assertion (A) : The molecularity of the given reaction is 2. 2HI –– H2 + I2 Reason (R) : Two molecules of the reactants are involved in simultaneous collision between them.
Q14
short answer
1 mark
Assertion (A) : Zinc, cadmium and mercury are not considered as transition elements. Reason (R) : These elements have completely filled orbitals in their ground state as well as in their common oxidation states.
Q15
short answer
1 mark
Assertion (A) : Aromatic primary amines can be prepared by Gabriel Phthalimide synthesis. Reason (R) : Aryl halides do not undergo nucleophilic substitution with the anion formed by phthalimide.
Q16
short answer
1 mark
Assertion (A) : Glucose gets oxidized to six carbon gluconic acid on reaction with bromine water. Reason (R) : The carbonyl group is absent in the open chain structure of glucose.
Q17
short answer
2 marks
The concentration of the reactant is reduced from 0.6 mol L–1 to 0.2 mol L–1 in 5 minutes in a first order reaction. Calculate rate constant of the reaction. (log 3 = 0.48)
Q17
short answer
2 marks
Rate constant k for the first order reaction is 2.54 10–3 s–1. Calculate the time required for three-fourth of the reactant to decompose. (log 4 = 0.60)
Q18
short answer
2 marks
(a) Define activation energy. (b) Write the unit of rate constant for (i) zero order reaction, (ii) second order reaction.
Q19
short answer
2 marks
(a) First ionization enthalpy of Cr is lower than that of Zn. Why? (b) Mention any one property of the transition elements which makes them good catalysts.
Q20
short answer
2 marks
(a) Define coordination number. (b) Indicate the type of isomerism shown by the following complex: [Co(en)3]Cl3
Q21
short answer
2 marks
(a) Draw the structure of the given compound : 4–Bromo–3–methylpent–2–ene (b) What happens when chloroethane is treated with aqueous potassium hydroxide?
Q22
short answer
3 marks
When 1.5 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point of benzene got raised from 353.23 K to 353.93 K. Calculate the molar mass of the solute. (Given Kb for benzene = 2.52 K kg mol–1)
Q23
short answer
3 marks
Calculate emf of the following cell at 298 K : Sn | Sn2+ (0.001 M) || H+ (0.01 M) | H2(g) (1 bar) | Pt(s). Given : Eo Sn2+/Sn = – 0.14 V, Eo H+/H2 = 0.00 V [log 10 = 1]
Q24
short answer
3 marks
(a) Complete and balance the following equations : (i) 2KMnO4 --513 K--> (ii) Na2Cr2O7 + 2KCl --> (b) Why is it difficult to separate lanthanoid elements in pure state?
Q25
short answer
3 marks
(a) [Co(NH3)6]3+ is diamagnetic whereas [CoF6]3– is paramagnetic. Justify the statement. [Atomic number of Co = 27] (b) Write the electronic configuration for d4 ion if Δ0 > P on the basis of crystal field theory.
Q26
short answer
3 marks
(a) Write the major product in the following reactions : (reaction with Br2/heat) (b) Define Racemic mixture. (c) p-dichlorobenzene has a higher melting point as compared to its ortho and meta isomers. Why?
Q27
short answer
3 marks
Write the reaction involved in (a) Rosenmund’s reduction (b) Cannizzaro’s reaction (c) Hell – Volhard – Zelinsky reaction
Q30
short answer
3 marks
(A) (a) Define Reducing sugar (b) Differentiate between: (i) Fibrous proteins and globular proteins (ii) Nucleotide and nucleoside
Q31
short answer
3 marks
(B) Write the reaction of glucose with the following : (a) H2N – OH (b) (CH3CO)2O (c) conc.HNO3
Q32
long answer
(a) Define the following term :
(a) Reducing sugar
(b) Differentiate between the following :
(i) Fibrous proteins and globular proteins
(ii) Nucleotide and nucleoside
Reading Passage
Osmosis is a process by which the molecules of a solvent pass from a solution of low solute concentration to a solution of high solute concentration through a semi-permeable membrane. Osmotic pressure is a colligative property. When the applied pressure on a solution exceeds its osmotic pressure, reverse osmosis occurs. When two solutions are separated by a semipermeable membrane and they have same osmotic pressure they are said to be isotonic. Of the two solutions separated by a semipermeable membrane, if one is a lower osmotic pressure, it is said to be hypotonic relative to the second solution. If it has a higher osmotic pressure, than the second solution, it is said to be hypertonic relative to the second solution. The osmotic pressure associated with the fluid inside the blood cell is equivalent to that of 0.9% (mass/volume) sodium chloride solution called normal saline solution and it is safe to inject intravenously. Osmotic pressure is vital in daily life and nature. It helps in explain, why IV fluids match blood’s osmotic pressure, its also the principle behind food preservation using salt or sugar.
Q33
short answer
2 marks
Calculate the amount of CaCl2 (i = 2.59) dissolved in 2.46 litre of water such that its osmotic pressure is 0.70 atm at 27°C. [Given : R = 0.082 L atm K–1 mol–1, molar mass of CaCl2 = 111 g mol–1]
Q34
short answer
1 mark
When raisins are kept in water, they get swollen. Name the phenomenon involved in this process.
Q35
short answer
1 mark
Why osmotic pressure is more advantageous than other colligative properties ?
Q36
short answer
1 mark
Which phenomenon is responsible for desalination of sea water ?
Reading Passage
30. Like NH3, nitrogen atom of amine is trivalent and carries an unshared pair of electrons. Nitrogen orbitals in amines are therefore sp3 hybridised and the geometry of amines is pyramidal. Lower aliphatic amines are soluble in water due to the formation of hydrogen bond with water molecules. The solubility decreases as the molar mass of amines increases due to increase in size of hydrophobic part. Higher amines are insoluble in water. However amines are less soluble in water than alcohols because of low electronegativity of nitrogen as compared to oxygen. Boiling points of isomeric amines follow the order 1º > 2º > 3º. It is due to the fact the amines are held together due to hydrogen bonding. Extent of hydrogen bonding is more in primary amines than in secondary amines as two hydrogen atoms are available for hydrogen bond formation. Tertiary amines do not show hydrogen bonding because of the absence of hydrogen atom attached to nitrogen. Amines can be prepared from, nitro compounds, nitriles, amides etc.
Q37
short answer
2 marks
(a) Complete the following equations : (i) CH3CONH2 ----(i) LiAlH4 (ii) H2O (ii) Fe + HCl ----
Q38
short answer
1 mark
(b) Why primary amines have higher boiling points than tertiary amines ?
Q39
short answer
1 mark
(c) Classify the following amines as primary, secondary or tertiary : (i) (ii)
Q40
short answer
1 mark
(c) Out of Butan–1–amine and Butan–1–ol, which is more soluble in water ?
Q41
long answer
3 marks
31. (A) (a) How will you convert the following : (i) Propanone to Propene (ii) Benzoic acid to Benzaldehyde (iii) Benzene to m-Nitroacetophenone
Q42
short answer
2 marks
(b) (i) Arrange the following compounds in increasing order of their reactivity towards HCN : CH3 CH3 C = O, (CH3)3 C (CH3)3 C C = O, CH3 H C = O (ii) Identify the compounds, which would undergo Aldol condensation : HCHO, C6H5CHO, CH3CHO,
Q43
long answer
3 marks
OR (B) (a) Give chemical tests to distinguish between the following pairs of compounds : (i) Acetophenone and Benzophenone (ii) Propanal and Propanone (iii) Pentan–2–one and Pentan–3–one
Q44
short answer
2 marks
(b) (i) Which of the following acids is stronger and why ? CH2FCOOH, CH3COOH (ii) Arrange the following compounds in the increasing order of their boiling points : CH3OCH3, CH3CH2CH3, CH3CH2OH, CH3CHO
Q45
short answer
3 marks
How will you convert the following: Propanone to Propene
Q46
short answer
How will you convert the following: Benzoic acid to Benzaldehyde
Q47
short answer
How will you convert the following: Benzene to m-Nitroacetophenone
Q48
short answer
2 marks
Arrange the following compounds in increasing order of their reactivity towards HCN: CH3COCH3, (CH3)3 C-CHO, CH3CHO
Q49
short answer
Identify the compounds, which would undergo Aldol condensation: HCHO, C6H5CHO, CH3CHO
Q50
short answer
3 marks
Give chemical tests to distinguish between: Acetophenone and Benzophenone
Q51
short answer
Give chemical tests to distinguish between: Propanal and Propanone
Q52
short answer
Give chemical tests to distinguish between: Pentan–2–one and Pentan–3–one
Q53
short answer
2 marks
Which of the following acids is stronger and why? CH2FCOOH, CH3COOH
Q54
short answer
Arrange the following compounds in the increasing order of their boiling points: CH3OCH3, CH3CH2CH3, CH3CH2OH, CH3CHO
Q55
short answer
3 marks
The conductivity of 0.1 mol L–1 solution of NaCl is 1.06 × 10–2 S cm–1. Calculate its molar conductivity and degree of dissociation. (Given: λ°Na+ = 50.1 S cm2 mol–1, λ°Cl– = 76.5 S cm2 mol–1)
Q56
short answer
2 marks
Following cell reaction occurs in a galvanic cell: 2Ag+(aq) + Zn(s) → 2Ag(s) + Zn2+(aq) E°(cell) = +1.56 V. Predict the direction of flow of current.
Q57
short answer
Differentiate between a primary battery and a secondary battery.
Q58
short answer
3 marks
Resistance of a conductivity cell filled with 0.1 M KCl solution is 100 Ω. If the resistance of the same cell when filled with 0.01 mol L–1 KCl solution is 300 Ω, calculate the conductivity and molar conductivity of 0.01 mol L–1 KCl solution. The conductivity of 0.1 M KCl solution is 1.29 × 10–2 S cm–1.
Q59
short answer
2 marks
Write any two advantages of H2 – O2 fuel cell.
Q60
short answer
Why does the cell potential of mercury cell remain constant throughout the life?
Q61
long answer
5 marks
An organic compound ‘A’, with molecular formula C2H6O reacts with active metals such as sodium to give compound ‘B’ and hydrogen gas. ‘A’ on treatment with iodine and sodium hydroxide gives ‘C’ and in presence of H2SO4 at 413 K gives ‘D’ (C4H10O). ‘D’ on reaction with excess of HI gives ‘E’. Identify ‘A’, ‘B’, ‘C’, ‘D’ and ‘E’ and write all the reactions involved.
Q62
short answer
3 marks
Write the reagents which are used in the given conversions: Phenol to 2, 4, 6 – tribromophenol
Q63
short answer
Write the reagents which are used in the given conversions: Propene to propan–1–ol
Q64
short answer
2 marks
Explain the mechanism of acid catalyzed hydration of alkene to form corresponding alcohol.
