Final Examination-Class 8 D Chemistry Max Marks : 100 Time Allotted : 2 hours (8 D Chemistry)
All Questions are compulsory. Questions 1-50 are multiple choice questions carrying 1 marks each. Questions 51-54 are subjective and the intended marks are given alongside.
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1.The crystalline form of carbon which is a good conductor of electricity is. Single choice.
(1 Point)
diamond
graphite
fullerene
gas carbon
2.The bonds present between the carbon atoms in graphite are. Single choice.
(1 Point)
strong electrovalent bonds
weak electrovalent bonds
covalent bonds
Coardinate bonds
3.Identify the form of carbon which is not crystalline in nature.. Single choice.
(1 Point)
diamond
fullerene
lampblack
graphite
4.The allotrope of carbon used as black shoe polish is. Single choice.
(1 Point)
lampblack
gas carbon
charcoal
coke
5.The amorphous form of carbon which is used to manufacture synthetic petrol is. Single choice.
(1 Point)
graphite
coal
coke
diamond
6.An acid formed when carbon dioxide is dissolved in water under pressure. Single choice.
(1 Point)
3CaCO3
23H2CO3
HCl
3HNO3
7.Complete the following reaction. Single choice.
(1 Point)
2 + 22 →2K + 2H2O →
2 + 2K2O + H2
2 + 22KOH + H2
2 + 2K2O + H2O
+ 2KOH + H2O
8.Electronic configuration of Magnesium is. Single choice.
(1 Point)
2,8,22,8,2
2,6,42,6,4
2,8,32,8,3
2,4,62,4,6
9.Dry ice is. Single choice.
(1 Point)
solid sulphur dioxide
solid carbon dioxide
solid nitrogen dioxide
solid phosphorous pentaoxide
10.The displaced product of the displacement reaction of sodium and cold water is. Single choice.
(1 Point)
hydrogen
sodium
oxygen
carbon
11.An element Y has an electronic configuration 2,8,6.The element Y is a. Single choice.
(1 Point)
metal
non metal
noble gas
acid
12.A subatomic particle with no charge and unit mass is a. Single choice.
(1 Point)
proton
neutron
Electron
nucleus
13.An element Z with 0 valency is a. Single choice.
(1 Point)
metal
noble gas
non metal
base
14.An atom having stable configuration is. Single choice.
(1 Point)
argon
sodium
potassium
chlorine
15.An element X has 6 electrons in its outer or valence shell.Its valency is. Single choice.
(1 Point)
+2
-2
6
1
16.Cuprum is the Latin name for. Single choice.
(1 Point)
calcium
cobalt
copper
carbon
17.The valency of iron in FeO is. Single choice.
(1 Point)
+2
-2
+1
-1
18.Chemical name for dinitrogen oxide is. Single choice.
(1 Point)
nitric oxide
nitrogen pentoxide
nitrous oxide
nitric acid
19.The following is an example of. Single choice.
(1 Point)
1+Na1+
cation
anion
atom
molecule
20.The state of matter that has the least density and no free surfaces. Single choice.
(1 Point)
solid
liquid
gas
plasma
21.In Landolt's experiment,the form in which chemical energy stored up in the reactant is released is. Single choice.
(1 Point)
heat
pressure
temperature
mass
22.In napthalene,the inter particle attraction is. Single choice.
(1 Point)
high
low
Moderate
very high
23.The law of conservation of mass is strictly valid if mass and _____ are considered together. Single choice.
(1 Point)
volume
temperature
energy
mass
24.During melting of solids, the interparticle space. Single choice.
(1 Point)
decreases
increases
remains same
rapidly decreases
25.Particles which are in continuous motion possess energy called. Single choice.
(1 Point)
kinetic energy
potential energy
light energy
sound energy
26.Protons were discovered by. Single choice.
(1 Point)
Rutherford
JJ Thompson
William Crookes
Goldstein
27.The word atom is a Greek word meaning. Single choice.
(1 Point)
divisible
indivisible
small
indestructable
28.Electrons revolve around the nucleus in imaginary paths called. Single choice.
(1 Point)
circles
spheres
orbits
lines
29.Metals have a tendency to _______ electrons. Single choice.
(1 Point)
lose
gain
destroy
combine
30.Electro valency is a result of. Single choice.
(1 Point)
electron sharing
electron transferring
electron destruction
electron combination
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Answers
Answer:
1.The crystalline form of carbon which is a good conductor of electricity is. Single choice.
Answer:- graphite
2..The bonds present between the carbon atoms in graphite are. Single choice.
Answer:- covalent bonds
3.Identify the form of carbon which is not crystalline in nature.. Single choice.
Answer:- Carbon and diamond
4.The allotrope of carbon used as black shoe polish is. Single choice.
Answer:- lampblack
5.The amorphous form of carbon which is used to manufacture synthetic petrol is. Single choice
Answer:- coke
6.An acid formed when carbon dioxide is dissolved in water under pressure. Single choice.
Answer:- 23H2CO3
7. Complete the following reaction. Single choice
Answer:- + 2KOH + H2O
Answer:
The area of dark-colored skin on the breast that surrounds the nipple. ... The nipple and areola are shown on the outside of the breast. The lymph nodes, fatty tissue, ducts, and other parts of the inside of the breast are also shown
Explanation:
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