Milk of Magnesia is a suspension of magnesium hydroxide, $Mg(OH)_2$. It acts as an antacid by neutralizing excess hydrochloric acid in the stomach. Tranquilizers are for mental stress, analgesics for pain relief, and anaesthetics for inducing insensibility, making them incorrect.
Q2mcq1 mark
The addition of a catalyst during a chemical reaction alters, which of the following quantities ?
a.
Entropy
b.
Internal energy
c.
Activation energy
Correct Answer
d.
Enthalpy
Step-by-Step AI Explanation
Verified Method
A catalyst provides an alternative reaction pathway with a lower activation energy ($E_a$), thereby increasing the reaction rate. It does not affect the thermodynamic properties like entropy, internal energy, or enthalpy of the reactants or products.
Q3mcq1 mark
The metal extracted by Hall-Heroult process is :
a.
Cu
b.
Al
Correct Answer
c.
Zn
d.
Ni
Step-by-Step AI Explanation
Verified Method
The Hall-Heroult process is specifically used for the electrolytic reduction of pure alumina ($Al_2O_3$) dissolved in molten cryolite ($Na_3AlF_6$) to extract aluminium (Al).
Q4mcq1 mark
A magnetic moment of 1.73 BM will be shown by one among the following :
a.
[ ] -4 6 CoCl
b.
TiCl 4
c.
( ) 2 34 Cu NH [ ] +
Correct Answer
d.
( ) 2 4Ni CN [ ] -
Step-by-Step AI Explanation
Verified Method
The magnetic moment $\mu = \sqrt{n(n+2)} BM$. For $\mu = 1.73 BM$, $n = 1$ (one unpaired electron). In $[Cu(NH_3)_4]^{2+}$, the $Cu^{2+}$ ion is $d^9$, which leaves one unpaired electron in the $3d_{x^2-y^2}$ orbital, matching the magnetic moment. $TiCl_4$ ($d^0$), $[Ni(CN)_4]^{2-}$ ($d^8$ square planar, diamagnetic), and $[CoCl_4]^{2-}$ ($d^7$, 3 unpaired electrons) do not fit.
Q5mcq1 mark
Which one is correctly matched ?
a.
Foam - mist
b.
Emulsion - smoke
c.
Sol - whipped cream
d.
Gel - butter
Correct Answer
Step-by-Step AI Explanation
Verified Method
A gel is a colloidal system where a liquid is dispersed in a solid. Butter is a perfect example of a gel. Other options are incorrectly matched (e.g., whipped cream is foam, not sol).
Q6mcq1 mark
Which one of the following will cause common-ion-effect when added to the following dissociation equilibrium reaction ?
CH3COOH(aq) ⇌ CH3COO-(aq) + H+(aq)
a.
CH3COCl
Correct Answer
b.
AgCl
c.
CH3Cl
d.
HCl
Step-by-Step AI Explanation
Verified Method
The common-ion effect occurs when an ion already present in the equilibrium is added. $CH_3COCl$ hydrolyzes to produce $CH_3COO^-$ and $HCl$, providing a common $CH_3COO^-$ ion, which shifts the equilibrium to the left. HCl could also cause it via $H^+$ ions, but $CH_3COCl$ is the standard textbook example for acetate equilibrium shifts.
Q7mcq1 mark
Carbon atoms in Fullerene with formula C60 have __________ hybridisation.
a.
sp2
Correct Answer
b.
sp3
c.
sp3d
d.
sp
Step-by-Step AI Explanation
Verified Method
In Fullerene ($C_{60}$), each carbon atom is bonded to three other carbon atoms in a hexagonal/pentagonal arrangement, resulting in $sp^2$ hybridisation, similar to graphite.
Q8mcq1 mark
The most common oxidation state of Actinoids is :
a.
14
b.
12
c.
16
d.
13
Correct Answer
Step-by-Step AI Explanation
Verified Method
The actinoids show a variable oxidation state, but the most common and stable oxidation state across the series is +3.
Q9mcq1 mark
Assertion : Hex-4-ennitrile on reaction with Di-isobutyl aluminium hydride followed by Hydrolysis gives Hex-4-enal.
Reason : Di-isobutyl aluminium hydride is a selective reducing agent.
a.
Assertion is true but Reason is false.
b.
Both Assertion and Reason are true, but reason is not the correct explanation of assertion.
c.
Both Assertion and Reason are false.
d.
Both Assertion and Reason are true and reason is the correct explanation of assertion.
Correct Answer
Step-by-Step AI Explanation
Verified Method
DIBAL-H (Di-isobutyl aluminium hydride) is a selective reducing agent that specifically reduces nitriles to imines, which on hydrolysis yield aldehydes. Since it reduces the nitrile group while leaving the C=C double bond (in hex-4-ennitrile) unaffected, both the assertion and reason are true, and the reason correctly explains the selectivity of the reaction.
Q10mcq1 mark
Which of the following is used as the source of gamma rays ?
a.
Xe
b.
Ar
c.
Rn
Correct Answer
d.
Kr
Step-by-Step AI Explanation
Verified Method
Radon (Rn) is a radioactive noble gas. Among the options provided, radioactive elements are sources of high-energy radiation like gamma rays, whereas Xe, Ar, and Kr are stable noble gases in their natural isotopic form.
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For the complex, $[Pt(NO_2)(H_2O)(NH_3)_2]Br$ identify the following.
(a) Central metal atom/ion
(b) Co-ordination number
(c) Oxidation number of central metal ion
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Show that in case of first order reaction the time required for the completion of 99% is twice the time required for the completion of 90% of the reaction.
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(i) Find the oxidation state of Halogen in the following compounds. (1) $OF_2$ (2) $I_2O_4$ (ii) Complete the following reactions. (1) $P_4 + NaOH + H_2O \rightarrow$ (2) $XeF_6 + H_2O \rightarrow$ (3) $Cu + conc. H_2SO_4 \rightarrow$
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Compound (A) of molecular formula $C_6H_6O$ gives purple colouration with neutral $FeCl_3$. Compound (A) reacts with ammonia to give Compound (B ) and it also reacts with Zn dust to give Compound (C). Identify the Compounds A, B and C and write down the equations.
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