tick the correct options which of the following is a chemical change
Answers
Answer:
Give me the options first to tick the chemical change
Multiple Choice Questions
1. Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax
Soln:
The answer is (d) Melting of wax
Explanation:
Rusting of iron, combustion and burning of the candle are chemical changes where produced cannot be converted into reactants.
2. Which of the following is a chemical change?
(a) Twinkling of stars
(b) Cooking of vegetables
(c) Cutting of fruits
(d) Boiling of water
Soln:
The answer is (b) Cooking of vegetables
3. A chemical change may involve –
(a) change in colour only
(b) change in temperature only
(c) evolution of gas only
(d) any or all of the above
Soln:
The answer is (d) any or all of the above
Explanation:
A chemical change may involve a change in colour, temperature, smell or evolution of gas, heat, etc.
4. Which of the following is/are true when milk changes into curd?
Its state is changed from liquid to semi-solid.
It changes colour.
It changes the taste.
The change cannot be reversed. Choose the correct option from below :
(a) (i) and (ii) are correct
(b) (ii) and (iii) are correct
(c) (i), (iii) and (iv) are correct
(d) (i) to (iv) are correct
Soln:
Answer is (c) (i), (iii) and (iv) are correct
Solution:
When milk turn to turn it changes its shape to semisolid, its taste turn sour but its colour remains white hence the answer is c)
5. A man painted his main gate made up of iron, to
prevent it from rusting.
protect it from the sun.
make it look beautiful.
make it dust-free.
Which of the above statement(s) is/are correct?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) only (ii)
(d) (i) and (iii)
Soln:
The answer is (d) (i) and (iii)