Advertisements
Advertisements
प्रश्न
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
उत्तर
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained | K2SO4 Residue is potassium sulphate |
APPEARS IN
संबंधित प्रश्न
Define; catalyst.
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
State four conditions necessary for chemical reactions to take place.
Fill in the blank:
The substances which undergo chemical change are called _______
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write true or false :
No new substance is formed during a chemical reaction.
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)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
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)
Oxygen is a ______ in respiration.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Write the chemical reaction where the following changes are observed.
Gas is evolved
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.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
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.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Mention the various conditions required for a chemical reaction to occur.
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.
Write a note on the catalyst.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
Write the effects of chemical reactions.
