XI Standard - 11th - Chemistry - Second Midterm Test Question Paper - Samacheer Kalvi
II MID TERM TEST
STD: XI MARKS:25
SUB: CHEMISTRY TIME:
3 Hrs
PART
–I
Choose the correct answer: 15
X 1 = 15
1.
Assertion : Generally alkali and alkaline earth metals form super oxides
Reason : There is a single bond between O and O in super oxides.
a)
both assertion and reason are true and reason is the correct explanation of
assertion
b)
both assertion and reason are true but reason is not the correct explanation of
assertion
c)
assertion is true but reason is false d) both assertion and reason are
false
2.
Which of the following statement is false?
a)
Ca2+
ions are not important in maintaining
the regular beating of the heart
b)
Mg2+
ions are important in the green parts of
the plants
c)
Mg2+
ions form a complex with ATP d) Ca2+
ions are important in blood clotting
3.
Which of the following statements is incorrect?
a)
Li+ has
minimum degree of hydration among alkali metal cations.
b)
The oxidation state of K in KO2
is +1 c)
Sodium is used to make Na / Pb alloy
d) MgSO4
is readily soluble in water
4.
The
molality of a solution containing 1.8g of
glucose dissolved in 250g of water is
a) 0.2 M b)
0.01 M c) 0.02 M d) 0.04 M
5. Osmotic
pressure(
a) p =
nRT b) pV = nRT c) pRT
= n d)
none of these
6. Which one of the
following gases has the lowest value of Henry's law
constant?
a) N2 b) He c)
CO2 d) H2
7. The
Van't Hoff factor (i) for a dilute aqueous solution
of the strong electrolyte barium hydroxide is
a) 0 b) 1 c)
2 d) 3
8. An alkane is obtained
by decarboxylation of sodium propionate. Same alkane can be prepared by
a) Catalytic hydrogenation of
propene b) action of sodium
metal on iodomethane
c) reduction of 1 – chloro
propane d) reduction of
bromomethane
9.
2 – butyne on
chlorination gives
a) 1 – chloro butane b)
1, 2 – dichloro butane
c)
1, 1, 2, 2 – tetrachlorobutane d)
2, 2, 3, 3 – tetra chloro butane
10.
The C – H bond and C – C bond in ethane are formed by which of the following
types of overlap
a) sp3
– s and sp3 –
sp3
b)
sp2
– s and sp2
– Sp2
c)
sp – sp and sp – sp d)
p – s and p – p
11. Which of the
following is optically active
a) 2 – methyl pentane b) citric acid c) Glycerol d) none of of
these
12.
Arrange the following: HCl, HBr, HI, HF in order of decreasing reactivity towards alkene
a) HCl
> HBr >HI > HF b)
HCl < HBr < HI < HF
c) HI
> HBr >HCl > HF d)
HI < HBr < HCl < HF
13.
Dead burnt plaster is
a) CaSO4 b)
CaSO4.1/2 H2O c) CaSO4. H2O d) CaSO4.
2H2O
14.
Which of the following metal carbonate is thermally more stable
a) CaCO3 b)
MgCO3 c)
SrCO3 d)
BaCO3
15.
An unripe mango placed in a concentrated salt solution to prepare pickle
shrivels because
a)
It gains water due to osmosis b)
It losses water due to reverse osmosis c) It gains water due to reverse osmosis d) It loss water due
to osmosis
PART
–II
Answer any six questions:
(Q.no. 24 is compulsory) 6
X 2 = 12
16.
How is plaster of Paris
prepared?
17.
Beryllium halides are
covalent whereas magnesium halides are ionic why?
18.
Define the following terms: i) isotonic solution ii) Van’t Holf factor
19. What is molal depression
constant? Does it depend on nature of the solute?
20. What is retrograde
solubility?
21.
How will you distinguish 1 –
butyne and 2 – butyne?
22.
What happens when
isobutylene is treated with acidified potassium permanganate?
23. How do you prepare
benzene hexachloride(BHC) from Benzene?
24. 50 ml of tincture of
benzoin, an antiseptic solution contain 10 ml of benzoin. Calculate the volume
percentage of benzoin?
PART
–III
Answer any Six questions (Q.
No 33is Compulsory) 6
X 3 = 18
25.
Discuss briefly the
similarities between beryllium and aluminium.
26.
Write the chemical equations
for the reactions involved in solvay process of preparation of
sodium carbonate.
27.
Explain the effect of
pressure on the solubility.
28.
Explain Markownikoff 's rule
with suitable example.
29.
State and explain Henry’s
law.
30. (i)What is the
distinctive behavior of beryllium?
(ii) Why alkali earth metals are harder
than alkali metals.
31. Write a note on ideal and
non-ideal solution.
32.
How does Huckel’s rule help
to decide the aromatic character of a compound? Give example.
33. Complete the following
Part
IV
Answer all the questions 5 X 5 = 25
34. a) (i) Describe briefly the biological
importance of Calcium and magnesium.
(ii) Maintain the uses of plaster of Paris.
(OR)
b) Give
the uses of gypsum.
35. a) State Raoult law and obtain expression for
lowering of vapour pressure when nonvolatile
solute is dissolved in solvent.
(OR)
b) (i) what are colligative properties?
(ii)
what are the limitations of Henry’s Law?
36. a) (i)
Draw cis-trans isomers for
the following compounds
2-
chloro – 2 – butane and CH3– CH = CH – CH2 – CH3
ii)
Describe the conformers of n- butane.
(OR)
b) (i) Give the IUPAC names of the following
compounds.
1) CH3– CH
3)
37) a) Describe the mechanism
of nitration of benzene.
(OR)
b) Alkali earth metal (a) belongs to 3rd
period reacts with oxygen and nitrogen to form compound
(b) and (c) respect it undergo metal displacement
reaction with AgNO3 solute to form compound
(d) .Identify A, B, C and D
38) a) Write the following reaction:
(i) Wurtz – Fitting reaction ii) Friedel craft’s reaction iii) Corey – House mechanism.
(OR)
b) i)
What are the significances of osmotic pressure over other colligative
properties?
ii) Write any two advantage of using
standard solutions.
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