Advertisements
Advertisements
Question
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Advertisements
Solution
Copper displaces hydrogen from sulphuric acid and forms blue-coloured copper sulphate and hydrogen gas is evolved.
APPEARS IN
RELATED QUESTIONS
How do the following help in bringing about a chemical change?
light.
Write a short note on the information derived from a balanced chemical equation.
Fill in the blank
A new substance is formed in a _______ change.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Complete the table given below.
| Heat on copper carbonate | Test for gas evolved |
_____ is the basic material to manufacture urea.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
