Advertisements
Advertisements
प्रश्न
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
उत्तर
Sodium Sulphite | Sodium carbonate |
Sodium sulphite is the sodium salt of sulphurous acid having molecular formula Na2SO3, can be made by dissolving NaOH in H2SO3. In Sodium sulphite, the oxidation state of Sulphur is +4. | Sodium carbonate (Na2CO3) will effervesce when dilute acid is added and a colourless, odourless gas (carbon dioxide) will be given off which, if bubbled through lime-water, will turn it cloudy. |
Gas evolved is SO2. |
The gas evolved is carbon dioxide. |
APPEARS IN
संबंधित प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Define catalyst.
FILL IN THE BLANK
Negatively charged ions are called ..........
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Is kerosene an electrolyte or a non-electrolyte ?
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
Copper carbonate when heated, it turns :
Explain the following reaction with one suitable example of Displacement reaction.
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Name Affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Give a chemical test to distinguish between the following gases.
H2 and O2
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Complete the table given below.
Heat on sodium chloride | Colour imparted to flame during flame test |
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Rusting of iron is ______.
______ is the chemical name of rust.
Write the effects of chemical reactions.