Advertisements
Advertisements
प्रश्न
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Advertisements
उत्तर
Zinc carbonate is a white coloured solid. Hence, the colour of the residue obtained by heating Zinc carbonate is yellow.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron pipes coated with zinc do not get rusted easily.
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
FILL IN THE BLANK
Positively charged ions are called ........
Copper carbonate when heated, it turns :
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper nitrate to nitrogen dioxide
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
