Advertisements
Advertisements
प्रश्न
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Advertisements
उत्तर
(i) \[\ce{\underset{\text{magnesium}}{Mg} + \underset{\text{Blue copper sulphate}}{CuSO4} ->\underset{\text{colourless magnesium sulphate}}{MgSO4}+\underset{\text{copper}}{Cu}}\]
(ii) \[\ce{2Pb[NO3]2->\underset{\text{litharge (yellow)}}{2PbO} + 4NO2 + O2}\]
(iii) \[\ce{\underset{\text{colourless}}{Pb[NO3]} + 2Kl->\underset{\text{yellow ppt.}}{Pbl2 v} + 2KNO3}\]
APPEARS IN
संबंधित प्रश्न
FILL IN THE BLANK
Negatively charged ions are called ..........
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Give an example of a reaction where the following are involved:
Solution
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Give a word equation for the following reaction.
Two gases which combine to give a solid.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
______ is a chemical substance is used in whitewashing.
