Q1
mcq
1 mark
Electrochemical process is used in the extraction of which of the following element?
- A. Sodium
- B. Iron
- C. Silver
- D. Lead
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Q2
mcq
1 mark
The stability of $+1$ oxidation state increases in the sequence __________.
- A. $\mathrm{In < Tl < Ga < Al}$
- B. $\mathrm{Al < Ga < In < Tl}$
- C. $\mathrm{Ga < In < Al < Tl}$
- D. $\mathrm{Tl < In < Ga < Al}$
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Q3
mcq
1 mark
$\mathrm{XeF_6}$ on complete hydrolysis produces:
- A. $\mathrm{XeO_3}$
- B. $\mathrm{XeOF_4}$
- C. $\mathrm{XeO_2}$
- D. $\mathrm{XeO_2F_2}$
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Q4
mcq
1 mark
Which of the following statements is incorrect?
- A. $\mathrm{Co^{3+}}$ and $\mathrm{Fe^{2+}}$ have same number of unpaired electrons.
- B. Of all the known elements, Silver has the highest electrical conductivity at room temperature.
- C. To form a substitute alloy, the difference between the atomic radii of solvent and solute should be less than 15%.
- D. If the standard electrode potential ($E^\circ$) of a metal is large and negative, the metal is a powerful oxidising agent.
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Q5
mcq
1 mark
How many geometrical isomers are possible for $[\mathrm{Pt(Py)(NH_3)(Br)(Cl)}]$?
- B. 3
- C. 15
- D. 4
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Q6
mcq
1 mark
Assertion: Due to Frenkel defect, density of the crystalline solid decreases.
Reason: In Frenkel defect, cation and anion leaves the crystal.
- A. Assertion is true but Reason is false.
- B. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- C. Both Assertion and Reason are false.
- D. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
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Q7
mcq
1 mark
The half life period of a radioactive element is 140 days. After 560 days 1 g of element will be reduced to :
- A. $\frac{1}{8}$ g
- B. $\frac{1}{2}$ g
- C. $\frac{1}{16}$ g
- D. $\frac{1}{4}$ g
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Q8
mcq
1 mark
The pH of sodium formate solution in terms of $K_a$ and the concentration of the electrolyte is :
- A. $\mathrm{pH = 7 - \frac{1}{2}pK_a - \frac{1}{2}\log C}$
- B. $\mathrm{pH = 7 - \frac{1}{2}pK_a + \frac{1}{2}\log C}$
- C. $\mathrm{pH = 7 + \frac{1}{2}pK_a + \frac{1}{2}\log C}$
- D. $\mathrm{pH = 7 + \frac{1}{2}pK_a - \frac{1}{2}\log C}$
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Q9
mcq
1 mark
The molar conductivity of a $0.5\ \mathrm{mol\ dm^{-3}}$ solution of $\mathrm{AgNO_3}$ with specific conductance $5.76\times10^{-3}\ \mathrm{S\ cm^{-1}}$ at 298 K is :
- A. $0.086\ \mathrm{S\ cm^2\ mol^{-1}}$
- B. $2.88\ \mathrm{S\ cm^2\ mol^{-1}}$
- C. $28.8\ \mathrm{S\ cm^2\ mol^{-1}}$
- D. $11.52\ \mathrm{S\ cm^2\ mol^{-1}}$
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Q10
mcq
On which of the following properties does the coagulating power of an ion depend ?
- A. The magnitude of the charge on the ion alone.
- B. Both magnitude and sign of the charge on the ion.
- C. The sign of charge on the ion alone.
- D. Size of the ion alone.
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Q11
mcq
Propan-2-ol on reaction with anhydrous ZnCl$_2$ and concentrated HCl gives __________.
- A. 1-chloropropane
- B. Ethyl chloride
- C. 2-chloro-2-methyl propane
- D. 2-chloropropane
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Q12
mcq
$\mathrm{CH_3CH_2}$ $\xrightarrow[(ii)\ Zn/H_2O]{(i)\ O/NH_2}$ $X\to Y$ 'Y' is:
- A. Hexamethylene tetramine
- B. Formaldehyde
- C. Oxime
- D. Diacetone ammonia
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Q13
mcq
$\mathrm{C_6H_5NO_2}$ $\xrightarrow[273K]{\mathrm{Sn/HCl}}$ A $\xrightarrow[283K]{\mathrm{NaNO_2/HCl}}$ B $\xrightarrow{\mathrm{H_2O}}$ C 'C' is:
- A. $\mathrm{C_6H_5CHO}$
- B. $\mathrm{C_6H_5OH}$
- C. $\mathrm{C_6H_5NH_2}$
- D. $\mathrm{C_6H_5CH_2OH}$
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Q14
mcq
α-D(1) Glucose and β-D(1) Glucose are:
- A. Enantiomers
- B. Epimers
- C. Conformational isomers
- D. Anomers
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Q15
mcq
Drugs that bind to the receptor site and inhibit its natural function are called __________.
- A. enzymes
- B. antagonists
- C. molecular targets
- D. agonists
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Q17
short answer
Mention the type of hybridisation in the following compounds.
(a)BrF$_5$
(b)BrF$_3$
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Q18
short answer
Give the differences between double salts and coordination compounds.
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Q19
short answer
Write the rate law for the reaction in which the order with respect to the reactants X, Y and Z are $1/2$, $3/2$ and zero respectively.
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Q20
short answer
Explain the method by which colloidal solutions of ink and graphite are prepared.
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Q21
short answer
How will you convert phenol to phenolphthalein ?
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Q22
short answer
Give the tests for carboxylic acid group.
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Q23
short answer
How do antiseptics differ from disinfectants ?
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Q24
short answer
Calculate the pH of 1.5×10$^{-3}$ M solution of Ba(OH)$_2$.
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Q24
short answer
Calculate the pH of $1.5\times10^{-3}$ M solution of $\mathrm{Ba(OH)_2}$.
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Q25
short answer
Give the basic requirement for vapour phase refining.
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Q26
short answer
Give the electronic configuration of Ce$_{41}$ and Co$_{21}$.
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Q27
mcq
Which type of isomerism is exhibited by the following compounds ?
- A. [Co(NH$_3$)$_4$Br$_2$]Cl and [Co(NH$_3$)$_4$ClBr]Br
- B. [Co(NH$_3$)$_5$NO$_2$] and [Co(NH$_3$)$_5$ONO]
- C. [Pt(NH$_3$)$_4$][PdCl$_4$] and [Pd(NH$_3$)$_4$][PtCl$_4$]
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Q28
short answer
Calculate the percentage efficiency of packing in case of body centered cubic crystal.
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Q29
short answer
Prove that in case of first order reaction $t_{99.9\%}=10 t_{1/2}$.
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Q30
short answer
List any three characteristics of catalysts.
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Q33
long answer
An organic compound (A) with molecular formula C$_2$H$_7$N reacts with nitrous acid to form compound (B) which is unstable. Hence compound (B) gets converted to compound (C). Compound (C) is used as a substitute for petrol. Identify compounds (A), (B) and (C).
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Q34
long answer
5 marks
(a)(i)Write a short note on Gravity Separation process.
(ii)Sulphuric acid is a dehydrating agent. Explain with suitable examples.
OR
(b)(i)Give any three uses of silicones.
(ii)Write a short note on Fischer Tropsch synthesis.
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Q35
long answer
5 marks
(a)What is Lanthanoid contraction ? What are the causes and effects of Lanthanoid contraction ?
OR
(b)Based on Valence bond theory, explain why the geometry of [Ni(CO)$_4$] is tetrahedral and [Ni(CN)$_4$]$^{2-}$ is squareplanar.
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Q36
long answer
5 marks
(a)(i)Differentiate crystalline solids and amorphous solids.
(ii)Explain the rate determining step with an example.
OR
(b)Derive an expression for Ostwald’s dilution law.
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Q37
long answer
5 marks
(a)(i)Explain the thermodynamics of cell reactions.
(ii)Why salt bridge is used in Galvanic cells ?
OR
(b)How does diethyl ether react with the following ?
(i)Cl$_2$/light
(ii)dil H$_2$SO$_4$/H$_2$O
(iii)CH$_3$COCl/anhydrous ZnCl$_2$
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Q38
long answer
(a)Explain the mechanism of Cannizaro reaction.
OR
(b)(i)How will you convert benzene diazonium chloride to biphenyl ? Give the name of the reaction.
(ii)How will you confirm the presence of keto group at C-2 carbon in Fructose molecule ?
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