Advertisements
Advertisements
प्रश्न
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 dilute hydrochloric acid to silver nitrate.
Advertisements
उत्तर
Addition of dil. hydrochloric acid to silver nitrate: A white coloured precipitate of AgCl is seen.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Give an example of a reaction where the following are involved
Pressure
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
What do you understand by 'chemical reaction'?
What do you observe? When
Water is added to the quick lime.
Name: Two carbonates do not produce carbon dioxide on heating.
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 chemical test to distinguish between the following gases.
HCl and H2S
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
A chemical reaction is often accompanied by external indications or characteristics.
Which of the following is not an “element + element → compound” type reaction?
