Q1
mcq
1 mark
The phenomenon observed when a beam of light is passed through a colloidal solution is :
- A. Coagulation
- B. Cataphoresis
- C. Tyndall effect
- D. Electrophoresis
Correct Answer: C —
Solution
The scattering of light by colloidal particles is known as the Tyndall effect. Coagulation involves the precipitation of colloids, Cataphoresis and Electrophoresis refer to the movement of colloidal particles under an electric field.
Q2
mcq
1 mark
The following set of reactions are used in refining Zirconium. This method is called as __________.
$$Zr(impure) + 2I_2 \xrightarrow{523 K} ZrI_4$$
$$ZrI_4 \xrightarrow{1800 K} Zr(pure) + 2I_2$$
- A. Zone refining
- B. Liquation
- C. Mond’s process
- D. Van Arkel process
Correct Answer: D —
Solution
This set of reactions describes the Van Arkel process, which is specifically used for the refining of metals like Zirconium and Titanium. Zone refining, Liquation, and Mond's process operate on different physical or chemical principles (e.g., Mond's is for Nickel using $CO$).
Q3
mcq
1 mark
Match the following :
(1)Emulsion (i)Whipped Cream
(2)Gel (ii)Ink
(3)Foam (iii)Cream
(4)Sol (iv)Butter
- A. (1) - (iv), (2) - (iii), (3) - (ii), (4) - (i)
- B. (1) - (iii), (2) - (i), (3) - (ii), (4) - (iv)
- C. (1) - (ii), (2) - (i), (3) - (iv), (4) - (iii)
- D. (1) - (iii), (2) - (iv), (3) - (i), (4) - (ii)
Correct Answer: D —
Solution
Matching: (1) Emulsion is liquid-in-liquid, e.g., Cream (iii). (2) Gel is liquid-in-solid, e.g., Butter (iv). (3) Foam is gas-in-liquid, e.g., Whipped Cream (i). (4) Sol is solid-in-liquid, e.g., Ink (ii). Thus, (1)-(iii), (2)-(iv), (3)-(i), (4)-(ii).
Q4
mcq
1 mark
The pyrimidine bases present in DNA are :
- A. Cytosine and Thiamine
- B. Cytosine and Adenine
- C. Cytosine and Uracil
- D. Cytosine and Guanine
Correct Answer: A —
Solution
DNA contains the purine bases Adenine and Guanine, and the pyrimidine bases Cytosine and Thymine. Uracil is found in RNA instead of Thymine.
Q5
mcq
1 mark
The pH of an aqueous solution is zero. The solution is :
- A. Neutral
- B. Slightly acidic
- C. Basic
- D. Strongly acidic
Correct Answer: D —
Solution
The pH scale ranges from 0 to 14. A pH of 7 is neutral, pH < 7 is acidic, and pH > 7 is basic. A pH of 0 represents a very high concentration of hydrogen ions, corresponding to a strongly acidic solution.
Q6
mcq
1 mark
On reacting with neutral Ferric Chloride, Phenol gives :
- A. Dark green colour
- B. Red colour
- C. No colouration
- D. Violet colour
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Q7
mcq
1 mark
IUPAC name for the amine $$H_2N-CH_2(CH_2)_4CH_2NH_2$$
- A. Heptane-1, 7-diamine
- B. Hexamethylene diamine
- C. Hexane-1, 6-amine
- D. Hexane-1, 6-diamine
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Q8
mcq
1 mark
The number of electrons that have a total Charge of 9650 Coulombs is :
- A. 6.022\times 10^{22}
- B. 6.22\times 10^{23}
- C. 6.022\times 10^{-34}
- D. 6.022\times 10^{24}
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Q9
mcq
1 mark
Which of the following is not $sp^2$ hybridised ?
- A. Fullerene
- B. Graphite
- C. Diamond
- D. Graphene
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Q10
mcq
1 mark
$$CH_3-CHO + CO \xrightarrow{Rh/Ir\ complex} ?$$
- A. Poly propylene
- B. Butan-1-al
- C. Acetic acid
- D. Acetate
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Q11
mcq
1 mark
The crystal with a metal deficiency defect is :
- A. ZnO
- B. NaCl
- C. KCl
- D. FeO
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Q12
mcq
1 mark
In the following reaction, Product ‘X’ will not give :
- A. Iodoform test
- B. Tollen’s test
- C. Fehling solution test
- D. Victor Meyer test
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Q13
mcq
1 mark
Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behaviour over the entire temperature range is :
- A. (a)
- B. (b)
- C. (c)
- D. Both (b) and (c)
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Q14
mcq
1 mark
Which one of the following compounds is not formed ?
- A. $XeF_2$
- B. $XeOF_4$
- C. $NeF_2$
- D. $XeO_3$
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Q15
mcq
1 mark
In $[K_4Fe(CN)_6]$, the co-ordination number of $Fe^{2+}$ is __________.
- A. 4
- B. 2
- C. 3
- D. 6
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Q17
short answer
2 marks
Why ‘d’ block elements exhibit variable oxidation state ?
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Q21
short answer
2 marks
Mention any two factors that affect electrolytic conductance.
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Q22
short answer
2 marks
What is meant by Electro Osmosis ?
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Q23
short answer
2 marks
Write a short note on peptide bond.
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Q24
short answer
2 marks
From the following reaction, identify A and B.
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Q25
short answer
3 marks
What is meant by term “Coordination Number” ? What is the Coordination Number of atoms in a bcc structure ?
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Q26
short answer
3 marks
What are interhalogen compounds ? Give two examples.
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Q27
short answer
3 marks
Give the difference between double salts and coordination compounds.
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Q28
short answer
3 marks
Mention the factors responsible for the anomalous behaviour of the first element of p-block.
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Q29
short answer
3 marks
State Faraday’s laws of electrolysis.
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Q30
short answer
How are the following conversions effected?
(i) ethylene glycol → acetaldehyde
(ii) glycerol → acrolein
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Q31
short answer
Give the tests for carboxylic acid group.
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Q32
short answer
Give any three differences between DNA and RNA.
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Q33
short answer
Classify the following into covalent, molecular, ionic and metallic solids.
(i)Diamond (ii)Brass (iii)NaCl
(iv)Naphthalene (v)Glucose (vi)SiO2
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Q34
long answer
5 marks
(a) Explain Froth flotation process.
OR
(b)(i) Explain the bleaching action of Sulphur dioxide
(ii) Write any two uses of Helium.
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Q35
long answer
5 marks
(a)(i) What are interstitial compounds ?
(ii) Calculate the number of unpaired electrons in $Ti^{3+}$, $Mn^{2+}$ and calculate the spin only magnetic moment.
OR
(b)(i) What are the limitations of VB theory ?
(ii) Based on the VB theory, explain why $[Ni(CN)_4]^{2-}$ is diamagnetic.
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Q36
long answer
5 marks
(a)(i) Write two differences between rate and rate constant of a reaction.
(ii) Derive integrated rate law for a zero order reaction A → product.
OR
(b) Find the pH of a buffer solution containing 0.20 mole per litre sodium acetate and 0.18 mole per litre acetic acid. $K_a$ for acetic acid is 1.8×10⁻⁵.
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Q37
long answer
5 marks
(a)How will you convert benzaldehyde into the following compounds ?
(i)Benzoin
(ii)Cinnamic acid
(iii)Malachite green
OR
(b)(i)Differentiate primary, secondary and tertiary alcohols using Lucas test.
(ii)Give the uses of diethyl ether.
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Q38
long answer
5 marks
(a)Describe adsorption theory of catalysis.
OR
(b)A compound ‘A’ of molecular formula $C_{2}H_{3}N$ on reduction with Na(Hg)/$C_{2}H_{5}OH$ gives ‘B’ of molecular formula $C_{2}H_{7}N$ which undergoes carbylamine test. Compound ‘B’ on reaction with nitrous acid gives compound ‘C’ of molecular formula $C_{2}H_{6}O$ by liberating nitrogen. Identify A, B and C and write the reactions involved.
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Q39
mcq
1 mark
The following set of reactions are used in refining Zirconium. This method is called as __________.
Zr(impure) + 2I_{2} → 523 K → ZrI_{4}
ZrI_{4} → 1800 K → Zr(pure) + 2I_{2}
- A. Zone refining
- B. Liquation
- C. Mond’s process
- D. Van Arkel process
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Q40
mcq
1 mark
IUPAC name for the amine $H_{2}N CH_{2} (CH_{2})_{4} CH_{2} NH_{2}$
- A. Heptane-1, 7-diamine
- B. Hexamethylene diamine
- C. Hexane-1, 6-amine
- D. Hexane-1, 6-diamine
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Q41
long answer
5 marks
(a)Explain Froth flotation process.
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Q42
long answer
5 marks
(b)(i)Explain the bleaching action of Sulphur dioxide (ii)Write any two uses of Helium.
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Q43
long answer
5 marks
(a)(i)What are interstitial compounds? (ii)Calculate the number of unpaired electrons in Ti$^{3+}$, Mn$^{2+}$ and calculate the spin only magnetic moment.
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Q44
long answer
5 marks
(b)(i)What are the limitations of VB theory? (ii)Based on the VB theory, explain why [Ni(CN)$_{4}$]$^{2-}$ is diamagnetic.
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Q45
long answer
5 marks
(a)(i)Write two differences between rate and rate constant of a reaction. (ii)Derive integrated rate law for a zero order reaction A → product.
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Q46
long answer
5 marks
(b)Find the pH of a buffer solution containing 0.20 mole per litre sodium acetate and 0.18 mole per litre acetic acid. K$_{a}$ for acetic acid is 1.8×10$^{-5}$.
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Q47
long answer
5 marks
(a)How will you convert benzaldehyde into the following compounds? (i)Benzoin (ii)Cinnamic acid (iii)Malachite green
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Q48
long answer
5 marks
(b)(i)Differentiate primary, secondary and tertiary alcohols using Lucas test. (ii)Give the uses of diethyl ether.
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Q49
long answer
5 marks
(a)Describe adsorption theory of catalysis.
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