Advertisements
Advertisements
प्रश्न
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.
उत्तर
Oxygen is a reactant in respiration.
संबंधित प्रश्न
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
State the main characteristics of chemical reactions. Give at least one example in each case.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
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.
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Give two examples for each of the following cases:
Chemical changes.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
