Advertisements
Advertisements
Question
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Solution
| Ammonia | Hydrogen chloride |
| Litmus test: Moist red litmus blue. | Litmus test: Moist blue litmus paper red. |
APPEARS IN
RELATED QUESTIONS
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
Changes in which new substances are formed are called ______ changes.
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
How do the following help in bringing about a chemical change?
pressure.
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
State four conditions necessary for chemical reactions to take place.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Give an example of the following chemical change.
Two solids combine to form a liquid
State the main characteristics of chemical reactions. Give at least one example in each case.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
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
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
______ is the chemical name of rust.
