Advertisements
Advertisements
प्रश्न
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.
विकल्प
True
False
Advertisements
उत्तर
This statement is False.
Explanation:
Iron is a metal, while rust is iron oxide, a compound formed when iron reacts with oxygen and moisture.
APPEARS IN
संबंधित प्रश्न
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Fill in the blank.
Melting of ice is a _______ change.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
