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WorksheetsChemistry
Total questions: 22
Worksheet time: 15mins
1.The black residue obtained on heating copper carbonate.
2.The basic gas obtained when two gases react in the presence of a catalyst and the reaction is exothermic.
3.The gas obtained when potassium chloride is heated in the presence of a catalyst.
4.The pale blue precipitated obtained when copper [II] sulphide reacts with sodium hydroxide.
5.The gas reacts with oxygen to give a neutral liquid.
B - 1
C - 2
E - 5
D - 3
Write the formula of Silver Sulphide
(a)
How to reduce pollution?
Using public transports
Use of Air Condition instead of a fan
Implement Afforestation
By constructing buildings
I am a chemical element. I come 18th in the periodic table. I don't react with any gases. I am the third most abundant gas in the atmosphere. Who am I?
(a)
Decomposition of potassium chlorate requires heat which acts as a X. -
YTSACLAT (unscramble X)
(a)
I am a naturally occurring radioactive gas. -
NDROA (unscramble)
(a)
Write the product formed in this following reaction-
Magnesium Dioxide is added to Potassium chlorate and heated
Potassium chloride and oxygen
Magnesium chloride and Oxygen
Potassium dioxide and hydrogen
Magnesium oxide and Oxygen
When potassium iodide solution is added to lead acetate solution. A brown precipitate is formed.
True
False
Which of the following are types of precipitate?
Fog
Snow
Sleet
Smoke
You took a compound called CuCO₃ and heated it. CuO is formed and CO₂ gas is evolved. Can you term it as effervescence?
Yes
No
Is it right?
Yes
No
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
True
False
What was the name given to the reaming 4/5th portion of the air in the bell jar which did not support the burning of air. What name was later given? (write - New name, old name)
(a)
Alkaline pyrogallol solution turns brown when oxygen is passed through it.
True
False
Name the substance mixed with oxygen to get a flame with a temperature of 3300oC and is used for cutting and welding metals. What is the flame called? ( write- substance, Flame name)
(a)
Which of the following gases do not contribute to the Green House Effect?
Nitrogen Dioxide
Water Vapour
Carbon Dioxide
Methane
Chemical equations are written as:- Equation 1 : A + BC → AC + B↑ ; Equation 2 : AB +CD → AD + CB a) In which equation can you smell a gas?
Equation 1
Equation 2
Which of the following is an endothermic reaction?
Reaction of iron sulphide and hydrochloric acid
Reaction of sodium hydroxide and hydrochloric acid
Reaction of barium chloride and sodium sulphate
Reaction of iron and copper sulphate
A gas X when passed through blue litmus solution turns it to red. Another gas Y when passed through either blue litmus or red litmus does not change the colour of the litmus. Which is true?
X is basic while Y is neutral
Y is neutral while X is acidic
Y is basic while X is acidic
Y is acidic while X is neutral
A gas collected by the upward displacement of air but cannot be collected by downward displacement of water. Identify the probable characteristics of the gas.
It is heavier than air and is insoluble in water
Its vapour density is equal to air and it is highly soluble in water.
It is heavier than air and it is highly soluble in water
It is lighter than air and water
Generally, a metal gets corroded due to oxidation. Name a metal that becomes chemically resistant due to oxidation.
zinc
copper
aluminium
iron
Fountain ink pen leaks at higher altitudes. It is due to
Low atmospheric pressure
High temperature
High atmospheric pressure
Both (a) and (b)
