Advertisements
Advertisements
Question
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Advertisements
Solution
CuCO3 → CuO + CO2 ↑
The blue-green powder turns black and a colourless gas is evolved which extinguishes a burning flame.
APPEARS IN
RELATED QUESTIONS
How do the following help in bringing about a chemical change?
light.
Give a reason.
Wasp sting is treated with vinegar.
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
TRUE \ FALSE
Ammonia is a good oxidizing agent.
What are homogenous reactions ?
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Give one example electrochemical reaction.
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Select the correct answer for the following options:
The pale blue precipitated obtained when copper [II] sulphate reacts with sodium hydroxide.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
What happens when cane sugar is strongly heated? Mention any two changes in it.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Analogy:
H2O: Water:: NaCl: ______.
