Advertisements
Advertisements
Question
A chemical change may involve –
Options
change in colour only
change in temperature only
evolution of gas only
any or all of the above
Advertisements
Solution
any or all of the above
Explanation:
A chemical change may involve a change in colour, temperature, smell or evolution of gas, heat, etc.
APPEARS IN
RELATED QUESTIONS
How do the following help in bringing about a chemical change?
pressure.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
| 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 |
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
Explain the following statement: Digestion is a chemical change.
Analogy:
H2O: Water:: NaCl: ______.
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
