The phenomenon observed when a beam of light is passed through a colloidal solution is :
a.
Coagulation
b.
Cataphoresis
c.
Tyndall effect
Correct Answer
d.
Electrophoresis
Step-by-Step AI Explanation
Verified Method
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.
Q2mcq1 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
Step-by-Step AI Explanation
Verified Method
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 $CO$).
Q3mcq1 mark
Match the following :
(1)Emulsion (i)Whipped Cream
(2)Gel (ii)Ink
(3)Foam (iii)Cream
(4)Sol (iv)Butter
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).
Q4mcq1 mark
The pyrimidine bases present in DNA are :
a.
Cytosine and Thiamine
Correct Answer
b.
Cytosine and Adenine
c.
Cytosine and Uracil
d.
Cytosine and Guanine
Step-by-Step AI Explanation
Verified Method
DNA contains the purine bases Adenine and Guanine, and the pyrimidine bases Cytosine and Thymine. Uracil is found in RNA instead of Thymine.
Q5mcq1 mark
The pH of an aqueous solution is zero. The solution is :
a.
Neutral
b.
Slightly acidic
c.
Basic
d.
Strongly acidic
Correct Answer
Step-by-Step AI Explanation
Verified Method
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.
Q6mcq1 mark
On reacting with neutral Ferric Chloride, Phenol gives :
a.
Dark green colour
b.
Red colour
c.
No colouration
d.
Violet colour
Correct Answer
Step-by-Step AI Explanation
Verified Method
Phenols react with neutral ferric chloride ($FeCl_3$) to form an iron-phenolate complex, which gives a characteristic violet or purple colour. This is a standard test for the presence of the phenolic -OH group.
Q7mcq1 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
Correct Answer
Step-by-Step AI Explanation
Verified Method
The structure $H_2N-(CH_2)_6-NH_2$ has 6 carbon atoms in the chain, making it a hexane derivative. With amino groups at positions 1 and 6, the correct IUPAC name is Hexane-1,6-diamine.
Q8mcq1 mark
The number of electrons that have a total Charge of 9650 Coulombs is :
a.
6.022\times 10^{22}
Correct Answer
b.
6.22\times 10^{23}
c.
6.022\times 10^{-34}
d.
6.022\times 10^{24}
Step-by-Step AI Explanation
Verified Method
The number of electrons $n$ is given by $n = \frac{Q}{e}$. Given $Q = 9650 \, C$ and $e = 1.602 \times 10^{-19} \, C$, $n = \frac{9650}{1.602 \times 10^{-19}} \approx 6.023 \times 10^{22}$ electrons.
Q9mcq1 mark
Which of the following is not $sp^2$ hybridised ?
a.
Fullerene
b.
Graphite
c.
Diamond
Correct Answer
d.
Graphene
Step-by-Step AI Explanation
Verified Method
In Diamond, each carbon atom is bonded to four other carbon atoms through single covalent bonds, resulting in $sp^3$ hybridisation. In contrast, Fullerene, Graphite, and Graphene all consist of carbon atoms with $sp^2$ hybridisation.
Q10mcq1 mark
$$CH_3-CHO + CO \xrightarrow{Rh/Ir\ complex} ?$$
a.
Poly propylene
b.
Butan-1-al
c.
Acetic acid
Correct Answer
d.
Acetate
Step-by-Step AI Explanation
Verified Method
The reaction $CH_3-CHO + CO \xrightarrow{Rh/Ir\ catalyst} CH_3COOH$ is known as the Monsanto process (or carbonylation of methanol if starting from methanol, but the carbonylation of acetaldehyde yields acetic acid). Acetic acid is the final product.
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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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(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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(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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(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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(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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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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(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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(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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