Advertisements
Advertisements
प्रश्न
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
उत्तर
| Addition of dil. H2SO4 to zinc | Test for gas evolved | The gas [H2] evolved burns with 'pop' sound and burns with pale blue flame |
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Define precipitation.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
What are homogenous reactions ?
How is a strong electrolyte different from a weak electrolyte?
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
Give an example of a reaction where the following are involved
Heat
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Give a chemical test to distinguish between the following gases.
H2 and CO2
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.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
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.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper nitrate to nitrogen dioxide
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
The chemical formula of rust is ______.
