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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.
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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.
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
How do the following help in bringing about a chemical change?
heat.
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Define precipitation reaction.
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
Give reason.
Acidic soil is treated with quick lime.
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Fill in the blank:
The substances which undergo chemical change are called _______
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
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)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
Limestone contains ______ mainly.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Burning of paper is the best example of ______ change.
