Advertisements
Advertisements
Question
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.
Solution
To prevent rusting, a layer of zinc metal is applied on iron sheets.
Reason:
Zinc is a non-corrosive metal. Therefore, layer of zinc prevents rusting.
APPEARS IN
RELATED QUESTIONS
Complete and balance the following chemical equations
Na + H2 O →
TRUE \ FALSE
Copper can displace iron from iron sulphate.
How is a strong electrolyte different from a weak electrolyte?
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)
Rusting of iron is a ______ chemical change.
What do you understand by 'chemical reaction'?
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
Name: Gas with rotten egg smell.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Give a word equation for the following reaction.
Two gases which combine to give a solid.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Match the chemical reactions in List I with the appropriate answer in List II.
List I | List II | ||
1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Which of the following statement is incorrect for a chemical reaction?
Galvanization is a process in which ______ is coated as a layer of iron.
Write the equation for the process of formation of rust.
Write five changes in the characteristics of a substance that can take place during a chemical change.
______ is the chemical name of limestone.