Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
To prevent rusting, a layer of zinc metal is applied on iron sheets.
Reason:
Zinc is a non-corrosive metal. Therefore, a layer of zinc prevents rusting.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Give a reason.
Wasp sting is treated with vinegar.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
How is a strong electrolyte different from a weak electrolyte?
Write true or false :
Hydrogen sulphide has rotten egg smell .
Explain the following reaction with one suitable example of Double decomposition reaction.
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Explain the term reactant and product giving examples.
What is a chemical reaction?
Define the following term:
Precipitate
Give an example of a reaction where the following are involved
Heat
Give an example of the following chemical change.
A reaction where colour change is noticed
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give a chemical test to distinguish between the following gases.
H2 and O2
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Give a suitable example with an equation to show the representation of a chemical reaction.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
