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प्रश्न
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
विकल्प
Ammonia
Hydrogen chloride
Hydrogen
Nitrogen dioxide
Nitric oxide
उत्तर
Ammonia
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations
Na + H2 O →
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Give an example of the following chemical change.
Two gases combine to form white solid
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Name: Gas with rotten egg smell.
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
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 acid to an active metal.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Melting of wax is a change where a solid changes to a liquid state. Give one more such change which you observe in your surroundings
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Write five changes in the characteristics of a substance that can take place during a chemical change.
Write the characteristics of chemical change.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
______ is the chemical name of slaked lime.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
