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Worksheetschemistry final revision
Total questions: 60
Worksheet time: 1hrs 2mins
Coal with largest C content is
anthracite
peat
lignite
bituminous
Which of the following properties is NOT a characteristic of a good fuel?
High Ignition temperature
Low cost
Causes minimum pollution
Readily available
Name the substance which is used in candle and ointment
Lubrication oil
Petrol
Bitumen
Paraffin wax
Name the process which is used to separate various constituent of petroleum
Lubrication
Refining
Paraffin
None of these
Refining of petroleum is done in
Fractionating Column
Zone refining Column
Pronounce Column
None of these
NAME A FUEL WHICH CAN BE USED AS A DOMESTIC FUEL
LPG
CNG
PETROL
BITUMEN
Identify the fuel that leaves more smoke and ash on burning.
Solid fuel
Liquid fuel
Gaseous fuel
None one of the above
Processes by which coal is formed-
Carbonisation
Distillation
Vapourisation
Evaporation
Where is kerosene mainly used?
In laying down roads
As fuel in jet engines
In making water proof materials
In furnaces of industries
Renewable resources ...
are not replaceable
are used more frequently than non renewables
are never going to run out
going to run out
Gas which occurs above the petroleum oil trapped under the rocks is
Oxygen
Biogas
Natural Gas
Carbondioxide
What do fuels combine with to produce heat and light?
Carbon dioxide
Carbon monoxide
Hydrogen
Oxygen
The diagram shows which of the following process
Destructive distillation
Fractional distillation
Carbonisation
Chlorination
Which of the following pair shows inexhaustible resource?
Air and sunlight
forest and minerals
coal and petroleum
silver and gold
Which of the following is not a product of coal?
coke
bitumen
coal tar
coal gas
The organisation which gives driving tips for conservation of fuels is
CPCB
SPCB
PCRA
IARI
Which of the following gas causes global warming
SO2
CO2
NO2
CFC
Like fuel the sun also provides heat and light. The process taking place in the sun is called
combustion
nuclear process
burning
all of these
Burning of charcoal in a closed room will produce
carbon dioxide
nitrogen dioxide
carbon monoxide
all of these
The substances which have very low ignition temperature will
catch fire easily
will not catch fire
catch fire after some time
none of these
CNG and LPG are the examples of
solid fuels
liquid fuels
gaseous fuels
they aren't fuels
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
Which of the following fuels has the highest calorific value?
Wood
Coal
Hydrogen
Petrol
The amount of heat energy produced on complete combustion of 1 kg of fuel is called
Calorific value
Significant value
Heat value
Internal value
Which is the hottest part in flame of candle ?
Blue (outer)
Yellow (middle)
Black (inner)
Wax part
Calorific value is measured in
Kilo joules
Kilo grams
Kilo joules per kg
Kilo metre
Global warming is caused due to ___________ concentration of CO2 in air
Decreased
Increased
Both a & b
None of these
Bursting of crackers is an example of
Rapid combustion
spontaneous combustion
Explosion
All of these
The acronym for putting out a fire using a fire extinguisher is PASS . What does PASS stands for
Pull, aim, squeeze, spread
Pul, accuracy, squeeze, spread
Pin, aim, squeeze, sweep
Pull, aim, squeeze, sweep
Properties of substances W, X, Y and Z are listed below:
W: A liquid metal
X: A liquid non-metal
Y: A gaseous non-metal
Z: A non-metal which conducts electricity
W, X, Y and Z are respectively
Iron, Iodine, hydrogen, and oxygen.
Gold, Sulphur, chlorine, and hydrogen
Copper, phosphorus, nitrogen, and carbon.
Mercury, bromine, oxygen, and graphite.
Sodium metal is kept immersed in kerosene oil because
It is a very reactive metal.
A lot of heat is evolved when sodium reacts with water.
It can even react with moisture present in air violently.
All of these.
An unknown metal X when placed in copper sulphate, red brown pieces of copper fall to the bottom of the test tube. When metal X is placed in Aluminium sulphate solution, no change is observed. Metal X can be:
Sodium
Potassium
Iron
Calcium
Substance X reacts with dilute HCl violently, Y reacts slowly while Z does not react at all. X, Y and Z could be respectively:
Cu, Al, Fe
Al, Na, Cu
Na, Cu, Fe
K, Al, Cu
In which of the following set-up’s reaction will take place?
i. Magnesium ribbon in copper sulphate solution.
ii. A few pieces of calcium in magnesium sulphate solution.
iii. Copper wire in zinc sulphate solution.
iv. Iron nails in magnesium sulphate solution.
(iii) and (iv) only
(i) and (iv) only
(ii) and (iii) only
(i) and (ii) only
Match column I with column II and select the correct option from the given codes:
a-iii, b.-iv, c-i, d-ii
a-i, b- ii, c-iv, d- iii
a-ii, b-iii, c-i, d-iv
a-iv, b-i, c-ii, d-iii
Which of the following statement is incorrect?
Gold and silver are the most malleable and ductile metals.
All metals are hard and strong.
Mercury and gallium are metals which exist in liquid state at room temperature.
Most of the metals have high specific gravities.
What will happen if you keep a solution of copper sulphate in an iron container for few days? What is the reason for your observation?
The surface of iron container will develop a green layer due to corrosion caused by copper sulphate.
Copper metal will be deposited in iron container since copper is more reactive than iron.
Nothing will happen since no reaction takes place between copper sulphate and iron.
Holes will be formed in the container as iron is more reactive than copper hence it displaces copper from its solution.
Kanika takes a burning substance and collects the evolved vapours in a test tube, making sure that they do not escape. A small amount of water is added to the test tube. To the solution obtained, a few drops of blue litmus solution are added. The litmus turns red. Which of the following could be the burning substance?
Magnesium.
Sulphur.
Sodium.
Iron.
Vidisha placed a copper wire in silver nitrate solution as shown in the figure:
Which of the following represents correct observation?
The colour of the solution turned blue and precipitate of solid silver was obtained.
Colour of the solution turned green and copper wire turned blue.
There was no change in the colour of the solution of the wire.
Colour of the solution became silver and there was no change in the colour of copper wire.
Read the following statements carefully and identify X, Y, and Z respectively.
i. X is stored under kerosene.
ii. Y catches fire on exposure to air and stored in water.
iii. Z does not react with cold or hot water but reacts with steam.
Na, Mg, Cu
Na, P, Fe
Cu, Zn, K
Zn, Cu, Na
Read the given statements and select the correct options:
Statement 1: Silver objects become green and lose their shine with passage of time.
Statement 2: Silver reacts with carbon dioxide and moisture present in the atmosphere.
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
Statement 1 is true and statement 2 is false.
Both statements 1 and 2 are false.
A few properties are listed as:
i. Form acidic oxides.
ii. Produce sound on hitting
iii. High tensile strength.
iv. Low density.
v. Brittle.
i, ii and v only
iii and iv only.
i , iv and v only.
iii and v only.
Read the given passage and fill in the blanks by selecting an appropriate option.
Non-metals find wide applications in industries. For example (i) is used in electrodes, (ii) is used in welding metals, (iii) is used to make antiseptic creams while (iv) is used as a preservative due to its inert nature.
Carbon, hydrogen, chlorine and phosphorus.
Hydrogen, oxygen, sulphur and nitrogen.
Graphite, hydrogen, sulphur and nitrogen.
Phosphorus, sulphur, oxygen and carbon.
Select the correct statements.
i. Magnesium ribbon on heating in air catches fire and burns with white flame to form magnesium oxide.
ii. All metals react with water to evolve hydrogen gas.
iii. Iron reacts with cold water slowly.
iv. Sodium metal is always kept in kerosene oil as it reacts vigorously with air and moisture.
i and iii only.
ii and iii only.
i and iv only.
ii and iv only.
Study the given table carefully and select the appropriate option.
I is copper; II is sulphur.
II is sulphur; III is coal.
III is iron; IV is copper.
II is coal; IV is copper.
Observe the given figure carefully. X and Y respectively are:
Zn (Zinc) and Ag (Silver).
Au (Gold) and Cu (Copper).
Fe (iron) and Cu (copper).
Zn (Zinc) and Cu (copper).
Aditya, a class 8 student investigated the reactivity of four metals, iron, copper, zinc, and aluminium. He arranged three experimental set-ups as shown in the diagram. Which of the following statements is correct regarding these experiments?
Reaction occurs in all the three beakers.
Colour of solution changes from blue to green in beaker 1.
Colour of solution changes from green to colourless in beaker 2.
All of these.
Which of the following polymer shows thermal stability and chemical inertness due to its high C-C bond energy
Wool
Cotton
Teflon
Polymer
The combination of two or more fibers is called......
bleeding
molding
melting
blending
What fiber smells like burning hair when burned?
cotton
jute
silk
wool
The plastics which do not remould again on heating are called:
Thermosetting plastics
Thermoplastics
Both of these
None of these
The contamination of air due to the presence or introduction of a dangerous substance describes:
Water Pollution
Primary Pollutant
Air Pollution
Point Source Pollution
Where does most of the air pollution come from?
Solar and Wind energy
Forest Fires and Cities
Planting trees and Agriculture
Vehicles and Industry
The contamination of water, usually as a result of human activities is which of the following?
Air Pollution
Water Pollution
Nonpoint Source Pollution
Primary Pollutant
