When compared to $\Delta T_f$ - value of a 0.01M glucose solution, the $\Delta T_f$ - value of 0.01M $MgCl_2$ solution
a.
increases about three times
Correct Answer
b.
increases about six times
c.
increases about ten times
d.
remains same
Step-by-Step AI Explanation
Verified Method
Freezing point depression $\Delta T_f = i \cdot K_f \cdot m$. For glucose (non-electrolyte), the van't Hoff factor $i = 1$. For $MgCl_2$ (strong electrolyte), $MgCl_2 \rightarrow Mg^{2+} + 2Cl^-$, so $i = 3$. Since the molality $m$ is the same, $\Delta T_f$ for $MgCl_2$ is 3 times that of glucose.
Q2mcq1 mark
The product/s obtained during the electrolysis of aqueous sodium chloride solution is/are
a.
$H_2$ only
b.
Na metal only
c.
Na and $Cl_2$
d.
$H_2$, $Cl_2$ and NaOH
Correct Answer
Step-by-Step AI Explanation
Verified Method
During the electrolysis of aqueous NaCl, the reactions are: At cathode: $2H_2O + 2e^- \rightarrow H_2(g) + 2OH^-$; At anode: $2Cl^- \rightarrow Cl_2(g) + 2e^-$. Sodium ions remain in the solution, resulting in $NaOH(aq)$. Thus, $H_2$, $Cl_2$, and $NaOH$ are the products.
Q3mcq1 mark
All natural and artificial radioactive decay of unstable nuclei take place by
a.
zero order kinetics
b.
first order kinetics
Correct Answer
c.
second order kinetics
d.
third order kinetics
Step-by-Step AI Explanation
Verified Method
Radioactive decay follows first-order kinetics where the rate of disintegration is directly proportional to the number of radioactive nuclei present at that time, expressed as $Rate = \lambda N$.
Q4mcq1 mark
The energy required to form activated complex is known as
a.
Kinetic energy
b.
Potential energy
c.
Activation energy
Correct Answer
d.
Collision frequency
Step-by-Step AI Explanation
Verified Method
Activation energy ($E_a$) is defined as the minimum extra amount of energy absorbed by a reactant system to reach the transition state or activated complex to convert into products.
Q5mcq1 mark
Which of the following statements is NOT correct?
a.
KMnO$_{4}$ oxidises iodide ion to iodine in acid medium
b.
Permanganate is diamagnetic
c.
Copper liberates hydrogen from acids
d.
Ti$^{2+}$ liberates hydrogen from dilute acids
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Q6mcq1 mark
The most stable complex in the following complexes is
The complex $[Fe(C_2O_4)_3]^{3-}$ is the most stable because $C_2O_4^{2-}$ is a bidentate ligand, leading to the chelate effect, which significantly increases the stability of coordination complexes compared to monodentate ligands.
Q7mcq1 mark
Match the List – I (complex) with List – II (central metal) and select the correct option.
List I: A. Blood pigment, B. Chlorophyll, C. Vitamin B$_{12}$, D. Wilkinson Catalyst
List II: i) Rh, ii) Co, iii) Mg, iv) Fe
a.
A – i, B – ii, C – iii, D – iv
b.
A – iv, B – iii, C – ii, D – i
Correct Answer
c.
A – iv, B – ii, C – iii, D – i
d.
A – i, B – iii, C – ii, D – iv
Step-by-Step AI Explanation
Verified Method
Blood pigment (Hemoglobin) contains Iron (iv), Chlorophyll contains Magnesium (iii), Vitamin $B_{12}$ contains Cobalt (ii), and Wilkinson catalyst is Chlorotris(triphenylphosphine)rhodium(I) (i). Matching leads to A-iv, B-iii, C-ii, D-i.
Q8mcq1 mark
The main product obtained when alkyl halides react with AgCN is
a.
cyanide
b.
isocyanide
Correct Answer
c.
alkyl nitrite
d.
nitroalkane
Step-by-Step AI Explanation
Verified Method
AgCN is a covalent compound. The nitrogen atom has a lone pair of electrons available for bonding, while the carbon is involved in a coordinate bond with silver. Consequently, the nitrogen attacks the alkyl halide to form isocyanide ($R-NC$).
Q9mcq1 mark
The compound used for the treatment of malaria is
a.
chloroquine
Correct Answer
b.
chloramphenicol
c.
halothane
d.
chloroform
Step-by-Step AI Explanation
Verified Method
Chloroquine is an antimalarial drug. Chloramphenicol is an antibiotic, halothane is an anaesthetic, and chloroform is a solvent/anaesthetic, making (a) the correct choice.
Q10mcq1 mark
Which of the following is benzylic alcohol?
a.
C$_{6}$H$_{5}$ – CH$_{2}$ – CH$_{2}$OH
b.
CH$_{3}$C$_{6}$H$_{5}$ – CH$_{2}$ – CH – OH
c.
C$_{6}$H$_{5}$ – CH$_{2}$ OH
Correct Answer
d.
CH$_{3}$CH$_{2}$OH
Step-by-Step AI Explanation
Verified Method
Benzylic alcohols are those in which the -OH group is attached to an $sp^3$ hybridized carbon atom bonded directly to an aromatic ring. $C_{6}H_{5} – CH_{2}OH$ fits this definition perfectly. Option (a) is a phenethyl alcohol, (b) is incorrectly written/substituted, and (d) is an aliphatic alcohol.
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Calculate the mole fraction of benzene and carbon tetrachloride in a solution made by dissolving 20g of benzene in 80g of carbon tetrachloride. (Molar mass of benzene = 78g $mol^{-1}$, Molar mass of carbon tetrachloride = 154g $mol^{-1}$)
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Determine the amount (in grams) of $CaCl_2$ (i = 2.47) dissolved in 2.5L of water such that its osmotic pressure is 0.75 atm at 27°C. (R = 0.0821 L.atm.$K^{-1}$.$mol^{-1}$, molar mass of $CaCl_2$ = 111 g.$mol^{-1}$)
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At 25°C, the following reaction takes place in the cell which has $E^0_{cell} = 0.235V$. Calculate the standard Gibb's energy (F = 96500 C$mol^{-1}$). $2Fe^{3+}_{(aq)} + 2I^-_{(aq)} \rightarrow 2Fe^{2+}_{(aq)} + I_{2(s)}$
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A solution of Ni $(NO_3)_2$ is electrolyzed between platinum electrodes using a current of 5A for 20 min. What mass of Ni is deposited at the cathode? (Atomic mass of Ni = 58.7, F = 96500 C $mol^{-1}$)
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The rate constant for the first order decomposition of $H_2O_2$ is given by the following equation: log k = 14.34 – 1.25 × $10^4$ K/T. Calculate $E_a$ for the reaction. (R = 8.314 J.$K^{-1}$ $mol^{-1}$)
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