ISC (Commerce)
ISC (Arts)
ISC (Science)
Academic Year: 2017-2018
Date: March 2018
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Fill in the blanks by choosing the appropriate word/words from the brackets
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
A Galvanic cell converts _______ energy into _______ energy.
Chapter:
Fill in the blanks by choosing the appropriate word/words from the brackets
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The percentage of unoccupied spaces in bcc and fcc arrangements are _______ and _____respectively
Chapter:
Fill in the blanks by choosing the appropriate word/words from the brackets
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
Propane-2-ol on reaction with iodine and sodium hydroxide gives ________ precipitate and the
reaction is called ___________ test.
Chapter:
Fill in the blanks by choosing the appropriate word/words from the brackets
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The geometry of XeOF4 molecule is ______ and the hybridisation of Xenon atom in the molecule is ________.
Chapter:
During the course of an SN1 reaction, the intermediate species formed is:
(1) a carbocation
(2) a free radical
(3) a carbanion
(4) an intermediate complex
Chapter:
Purification of aluminium by electrolytic refining is carried out by
(a)Hoope process
(b)Hall process
(c)Baeyer process
(d)Serperck process
Chapter:
An aqueous solution of urea freezes at –0.186°C, Kf for water = 1.86 K kg mol–1, Kb for water = 0.512 K kg mol–1. The boiling point of urea solution will be ______.
373.065 K
373.186 K
373.512 K
373.0512 K
Chapter:
In the dehydration of alcohols to alkenes by heating with concentrated sulphuric acid, the initiation step is:
(1) formation of carbonation
(2) formation of an ester
(3) protonation of the alcohol molecule
(4) elimination of water
Chapter:
Match the following
| 1 | Rate constant | a | Dialysis |
| 2 | Biodegradable polymer | b | Glycine |
| 3 | Zwitterion | c | Arrhenius equation |
| 4 | Purification of colloids | d | PHBV |
Chapter:
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
Chapter:
Account for the following:
Zn is not considered as a transition element.
Chapter:
Calculate the osmotic pressure of a solution prepared by dissolving 0.025 g of K2SO4 in 2.0 litres of water at 25°C assuming that K2SO4 is completely dissociated. (Mol. wt. of K2SO4 = 174 g mol–1)
Chapter:
What type of isomerism is shown by the following coordination compounds?
[PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2.
Write their IUPAC names.
Chapter:
- Write the rate law expression for the reaction \[\ce{A + B + C -> D + E}\], if the order of reaction is first, second and zero with respect to A, B and C respectively.
- How many times the rate of reaction will increase if the concentration of A, B and C are doubled in the equation given in (a) above?
Chapter:
The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.
Chapter:
How do antiseptics differ from disinfectants? Give one example of each.
Chapter:
State the role of the following chemicals in the food industry:
(i) Sodium benzoate
(ii) Aspartame
Chapter:
An aromatic organic compound [A] on heating with NH3 and Cu2O at high pressure gives [B]. The compound [B] on treatment with the ice-cold solution of NaNO2 and HCI gives [C], which on heating with Cu/HCl gives compound [A] again. Identify the compounds [A], [B] and [C]. Write the name of the reaction for the conversion of [B] to [C].
Chapter:
Write the name of the monomer of the following polymer:
Bakelite
Chapter:
Write the name of the monomer of the following polymer:
Nylon – 2 – Nylon – 6
Chapter:
Name the purine bases and pyrimidine bases present in RNA and DNA.
Chapter:
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How will you obtain the following? (Give balanced equation.)
Picric acid from phenol.
Chapter:
How will you obtain the following? (Give balanced equation.)
Ethyl chloride from diethyl ether.
Chapter:
How will you obtain the following? (Give balanced equation.)
(i) Anisole from phenol
(ii) Ethyl acetate from ethanol.
Chapter:
40% of a first-order reaction is completed in 50 minutes. How much time will it take for the completion of 80% of this reaction?
Chapter:
The freezing point of a solution containing 5.85 g of NaCl in 100 g of water is −3.348°C. Calculate Van’t Hoff factor ‘i’ for this solution. What will be the experimental molecular weight of NaCl?
(Kf for water = 1.86 K kg mol−1, at. wt. Na = 23, Cl = 35.5)
Chapter:
Examine the defective crystal given below and answer the question that follows:
| A+ | B− | A+ | B− | A+ |
| B− | B− | A+ | B− | |
| A+ | B− | A+ | A+ | |
| B− | A+ | B− | A+ | B− |
State if the above defect is stoichiometric or non-stoichiometric. How does this defect affect the density of the crystal? Also, write the term used for this type of defect.
Chapter:
Give a reason for the following:
For ferric hydroxide sol the coagulating power of phosphate ion is more than chloride ion.
Chapter:
Give a reason for the following:
Medicines are more effective in their colloidal form.
Chapter:
Give a reason for the following:
Gelatin is added to ice creams.
Chapter:
For the complex ion [Fe(CN)6]3−, state the type of hybridisation.
Chapter:
For the complex ion, [Fe(CN)6]3−:
State its magnetic property.
Chapter:
For the complex ion [Fe(CN)6]3−, state the oxidation number of the central metal atom.
Chapter:
Draw the structures of [Co(en)2Cl2]+ geometrical isomers.
Chapter:
Explain why Mn2+ is more stable than Fe2+ towards oxidation to +3 state. (At. no. of Mn = 25, Fe = 26)
Chapter:
Give reasons for the following:
The transition metals generally form coloured compounds.
Chapter:
Why do zirconium and Hafnium exhibit similar properties?
Chapter:
Complete and balance the following chemical equation:
\[\ce{KMnO4 + KI + H2SO4 ->}\] _____ + _____ + _____ + ______
Chapter:
Complete and balance the following chemical equation:
\[\ce{K2Cr2O7 + H2SO4 + H2S ->}\] ______ + ______ + ______ + ______
Chapter:
Complete and balance the following chemical equation:
\[\ce{KMnO4 + H2SO4 + FeSO4 ->}\] ______ + ______ + ______ + ______
Chapter:
Arrange the following in the increasing order of their basic strength:
Chapter:
Give a balanced chemical equation to convert methyl cyanide to ethyl alcohol.
Chapter:
What happens when benzene diazonium chloride reacts with phenol in the weak alkaline medium?
(Give a balanced equation).
Chapter:
Name the sulphide ore of Copper. Describe how pure copper is extracted from this ore.
Chapter:
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Calculate the emf and ΔG° for the cell reaction at 25°C:
\[\ce{\underset{(0.1 M)}{Zn_{(s)} | Zn^{2+}_{ (aq)}} || \underset{(0.01 M)}{Cd^{2+}_{ (aq)} | Cd_{(s)}}}\]
Given \[\ce{E^{\circ}_{Zn^{2+}/Zn}}\] = −0.763 and \[\ce{E^{\circ}_{Cd^{2+}/Cd}}\] = −0.403
Chapter:
The specific conductivity of a solution containing 5 g of anhydrous BaCl2 (mol. wt. = 208) in 1000 cm3 of a solution is found to be 0.0058 ohm−1 cm−1. Calculate the molar and equivalent conductivity of the solution.
Chapter:
What do you understand by electrochemical series?
Chapter:
How is the electrochemical series useful in predicting whether a metal can liberate hydrogen from acid or not?
Chapter:
Explain why:
Nitrogen does not form pentahalides.
Chapter:
Explain why:
Helium is used for filling weather balloons.
Chapter:
Draw the structures of the following:
(1) HClO4
(2) H3PO3
Chapter:
Explain why:
Mercury loses its meniscus in contact with ozone.
Chapter:
Explain giving reasons why the halogens are coloured and the colour deepens from fluorine to iodine.
Chapter:
Explain why:
Hydride of sulphur is a gas while hydride of oxygen is a liquid.
Chapter:
Complete and balance the following reactions:
(1) NaCl + MnO2 + H2SO4 → _____ + _____ + ______ + _____
(2) KMnO4 + SO2 + H2O → _____ + ______ + ______ + ______
Chapter:
Give balanced equations for the following reactions:
(1) Benzaldehyde reacts with hydrazine.
(2) Acetic acid reacts with phosphorous pentachloride.
(3) Acetone reacts with sodium bisulphite.
Chapter:
Give one chemical test each to distinguish between the following pairs of compounds:
(1) Ethanol and acetic acid
(2) Acetaldehyde and benzaldehyde
Chapter:
Write a chemical equation to illustrate the following name reaction:
Clemmensen’s reduction
Chapter:
Write a chemical equation to illustrate the following name reaction:
Rosenmund’s reduction
Chapter:
Write a chemical equation to illustrate the following name reaction:
HVZ reaction
Chapter:
Explain why:
(1) Acetaldehyde undergoes aldol condensation but formaldehyde does not.
(2) Acetic acid is a weaker acid as compared to formic acid.
Chapter:
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