Advertisements
Advertisements
प्रश्न
Give a chemical test to distinguish between the following gases.
HCl and H2S
उत्तर
| Hydrogen chloride | Hydrogen sulphide |
| Odour of gas: Pungent choking odour. | Odour of gas: Smell as of rotten eggs. |
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations:
\[\ce{Pb(NO3)2->[heat]}\] _________
Define catalyst.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
Fill in the blank
A new substance is always formed in a _______ change.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
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 |
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
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.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
The percentage composition of Nitrogen in Ureas is ______.
Which is used as a catalyst during the process of hydrogenation of oils?
