Multiple Choice Questions (MCQs). Tick (✓) the correct option:
1. Substances formed as a result of chemical reaction are called
(a) reactants
(b) product
(c) ingredient
(d) material
2. Which of the following is not a chemical change?
(a) burning of coal
(b) curdling of milk
(c) melting of ice
(d) digestion of food
3. When iron nail is kept in copper sulphate solution, the blue colour of copper sulphate solution
changes to :
(a) red
(b) orange
(C) greenish black
(d) yellow
4. Burning of paper is a:
(a) chemical change
(c) reversible change
(b) physical change
(d) none of these
Answers
Answer:
1. Product
2. Melting of ice
3. greenish black
4. chemical change
✩Answers✩
1.Substances formed as a result of a chemical reaction are called products.
Extras
Substances that take part in a chemical reaction is called the reactants .
2. Melting of ice is not a chemical change .
Extras
A chemical change is a change in which new substances are formed as products and these reactions are also irreversible and all the rest of the given changes(reactions) follows this criterias except Melting of ice .
3. When iron nail is kept in copper sulphate solution, the blue colour of copper sulphate solution changes to greenish black.
Extras
When iron nail is kept in copper sulphate solution iron displaces copper from the solution and thus the colour changes into a greenish one.
4. Burning of paper is a chemical change.
Extras
Burning of paper is a chemical change because the reaction is irreversible and a new product , ash is formed.