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प्रश्न
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
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उत्तर
Chemical Change.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
Fill in the blank
A new substance is formed in a _______ change.
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
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|
Shake the gas with blue litmus solution |
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Apply a burning splint to a gas |
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Galvanization is a process in which ______ is coated as a layer of iron.
We are advised to not to play with fireworks. Give reason.
When carbon dioxide is passed through lime water ______.
______ is a chemical substance is used in whitewashing.
