Advertisements
Advertisements
Question
Circle the odd one out. Give reason for your choice
Options
Growth of a child
Blinking of eye
Rusting
Germination of a seed
Advertisements
Solution
Rusting
Reason: Rusting is undesirable change. Others three are desirable changes.
APPEARS IN
RELATED QUESTIONS
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Fill in the blank
A new substance is formed in a _______ change.
Differentiate between in Chemical reaction and chemical equation.
Explain the following reaction with one suitable example of Double decomposition reaction.
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Give an example of a reaction where the following are involved
Heat
Write the chemical reaction where the following changes are observed.
Physical state is changed
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
The chemical change is ______.
_____ is the basic material to manufacture urea.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
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.
Rusting of iron is ______.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
