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
The depression in freezing point ($\Delta T_f$) is a colligative property given by $\Delta T_f = i \cdot K_f \cdot m$. For glucose, which is a non-electrolyte, the van't Hoff factor $i = 1$. For $MgCl_2$, which is an electrolyte, it dissociates as $MgCl_2 \rightarrow Mg^{2+} + 2Cl^-$, giving $i = 3$. Since the molality ($m$) is the same for both, $\Delta T_f$ for $MgCl_2$ will be approximately 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 $NaCl$ (brine), water is reduced at the cathode to form $H_2$ gas and $OH^-$ ions. Chloride ions are oxidized at the anode to form $Cl_2$ gas. The remaining $Na^+$ and $OH^-$ ions in the solution form $NaOH$. Thus, the products are $H_2$, $Cl_2$, and $NaOH$.
Q3mcq1 mark
All natural and artificial radioactive decay of unstable nucleii 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 is a spontaneous process where the rate of disintegration is directly proportional to the number of radioactive nuclei present at that time. This follows first-order kinetics, described by the rate law $Rate = -dN/dt = \lambda N$.
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 threshold energy level, which is required for the formation of the activated complex during a chemical reaction.
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
Correct Answer
d.
$Ti^{2+}$ liberates hydrogen from dilute acids
Step-by-Step AI Explanation
Verified Method
Copper ($Cu$) has a positive reduction potential ($E^\circ_{Cu^{2+}/Cu} = +0.34V$), meaning it is a weaker reducing agent than hydrogen. Therefore, it cannot displace hydrogen from dilute acids. The other options are correct: $KMnO_4$ is a strong oxidizer, $MnO_4^-$ is diamagnetic ($d^0$ configuration), and $Ti^{2+}$ is a strong reducing agent.
Q6mcq1 mark
The most stable complex in the following complexes is
a.
$[Fe(CO)_5]$
b.
$[Fe(CN)_6]^{3-}$
c.
$[Fe(H_2O)_6]^{3+}$
d.
$[Fe(C_2O_4)_3]^{3-}$
Correct Answer
Step-by-Step AI Explanation
Verified Method
The complex $[Fe(C_2O_4)_3]^{3-}$ contains oxalate ions ($C_2O_4^{2-}$), which are bidentate ligands. This creates a chelate effect, significantly increasing the stability of the complex compared to those with monodentate ligands like $H_2O$ or $CN^-$.
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 B12, 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
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. Upon reaction with alkyl halides, the nitrogen atom is the only nucleophilic site available to attack the alkyl group because the carbon atom is involved in a strong covalent bond with silver. This results in the formation of isocyanides ($R-NC$) as the major product.
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 a well-known antimalarial drug. Chloramphenicol is an antibiotic, halothane is an anesthetic, and chloroform is an organic solvent.
Q10mcq1 mark
Which of the following is benzylic alcohol?
a.
$C_6H_5 – CH_2 – CH_2OH$
b.
$C_6H_5 – CH_2 – CH(CH_3) – OH$
c.
$C_6H_5 – CH_2 OH$
Correct Answer
d.
$CH_3CH_2OH$
Step-by-Step AI Explanation
Verified Method
A benzylic alcohol is one where the hydroxyl group (-OH) is attached to a carbon atom next to an aromatic ring. In $C_6H_5 - CH_2OH$, the -OH is directly attached to the benzylic carbon. Option A is a phenylethanol derivative, B is a secondary alcohol, and D is ethanol.
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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$mol^{-1}$). $2Fe^{3+} + 2I^-
ightarrow 2Fe^{2+} + I_2(s)$
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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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Identify the compounds A, B and C in the following equation: Benzene + CO, HCl / Anhyd $AlCl_3$ $\rightarrow$ A; A + conc. NaOH / $\Delta$ $\rightarrow$ B + C
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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 – $1.25 imes 10^4$ K/T. Calculate $E_a$ for the reaction.
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