SOLVE THE SAMPLE PAPER
1. What
is the coordination number of each type of ions in a rock-salt type crystal structure
2. State the formula
relating pressure of a gas with its mole fraction
in a liquid solution in contact with it.
3.
What are point
defects? Mention its types.
4.
Why the process
of adsorption is always exothermic?
5.
Explain:
(i) Electrophoresis
(ii) Dialysis
6. A compound is formed by two elements X and Y. If the atoms of the element Y (as anions)
make ccpand those of the
element X (as cations) occupy all the octahedral voids, then what is the formula of the compound?
7. An element
has a body-centred cubic structure
with a cell edge of 288 pm. The density
of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?
8. The initial
concentration of N2O5 in the following first order reaction: N2O5 (g) € 2 NO2 (g) + 1/2 O2 (g) was 1.24 x 10-2mol/L at 318K. The concentration of N2O5 after 60 minutes was 0.20 x 10-2mol/L. Calculate
the rate constant of the reaction at 318
K.
9. Give the mechanism of preparation of ethyl alcohol
from ethene by acid catalysed
hydration.
10. Although p-hydroxy benzoic
acid is less acidic than benzoic acid, o-hydroxy benzoic
acid is 15 times
more acidic than benzoic acid. Why?
11.
(i) Define
thermoplastics and thermosetting polymers with two examples each.
(ii) How
polymers are classified?
12.
Complete the
following reactions:
(a) XeF4 + SbF6€
(b)
XeF4 + O2F2€
(c)
XeF4 +
H2O €
13.
Differentiate
natural and vulcanized rubber.
14. If N2 gas is bubbled through water at 293 K, then how many millimoles of N2 gas would dissolve
in 1 litre of water?
Assume that N2
exerts a partial
pressure of 0.987bar.
Given that Henry’s
law constant for N2 at 293 K is 76.48 kbar.
15. Under what conditions VantHoffs factor ‘i’ is equal to unity
and less than one and greater than one?
16. Explain
Brownian movement.
17.
Give the application of colloids in electrical precipitation
of smoke.
Give the application of colloids in electrical precipitation
of smoke.
18.
Give reasons:
(i) HI is better reagent than HBr for cleavage of ether.
(ii) Highly branched carboxylic acids are less acidic than
unbranched acids.
19.
Give reason:
Phosphorus has more tendency for catenation than nitrogen.
20.
Give the reason
for the following:
(a)
Ethyl iodide
undergoes SN 2 reaction
faster than ethyl bromide
Ethyl iodide
undergoes SN 2 reaction
faster than ethyl bromide
(b) (±) 2-Butanol is optically inactive.
(c) C
– X bond length in halobenzene is smaller than C – X bond length in CH3 – X.
21. Ethanol is used for drinking
purpose. But to refrain people from drinking
industrial alcohol, it is denatured. Now a day’s some countries
use ethanol as an additive
in gasoline since it is cleaner fuel.
(a)
What is
denatured alcohol? Why it is denatured?
(b)
Would you
support the use of ethanol as an additive in gasoline for India?
(c)
What are the
values associated with your decision?
22.
Give the cause
of lanthanoid contraction.
Give five chemical characteristics
of lanthanoids.
23. An organic
compound (A) with molecular formula
C8H8O forms an orange-red precipitate with 2,4-DNP reagent
and gives yellow
precipitate on heating
with iodine in the presence
of sodium hydroxide. It neither reduces Tollens’ or Fehlings’ reagent,
nor does it decolourise bromine water
or Baeyer’s reagent.
On drastic oxidation
with chromic acid, it gives
a carboxylic acid (B) having molecular formula
C7H6O2. Identify
the compounds (A) and (B) and explain
the reactions involved.
24. Write chemical equations for the following conversions:
(i) CH3–CH2–Cl into CH3–CH2–CH2–NH2
(ii) C6H5–CH2–Cl into C6H5–CH2–CH2–NH
(iii) Benzyl alcohol to phenylethanoic acid
(iv) 4-Methylacetophenone
to benzene-1,4-dicarboxylic acid
25. Calculate its resistivity, conductivity and molar conductivity, if the electrical resistance of a column of 0.05 mol L–1NaOHsolution of diameter 1 cm and length 50 cm is 5.55 × 10 ohm.
26. (a)
A solution of CuSO4 is electrolysed for 10 minutes
with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?
(b) What are the observations made in a galvanic cell after the circuit is completed?
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