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प्रश्न
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
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उत्तर
The colour of copper carbonate is green. On heating Copper carbonate, a black residue is formed and a gas is released which turns lime water milky.
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संबंधित प्रश्न
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
How is a strong electrolyte different from a weak electrolyte?
Define the following term:
Precipitate
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Give a suitable example with an equation to show the representation of a chemical reaction.
We are advised to not to play with fireworks. Give reason.
Acid rain is a result of ______.
