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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.
उत्तर
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.
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संबंधित प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Complete and balance the following chemical equations:
\[\ce{Pb(NO3)2->[heat]}\] _________
Define catalyst.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
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)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Give an example of a reaction where the following are involved
Electricity
Give an example of the following chemical change.
Two gases combine to form white solid
Write the chemical reaction where the following changes are observed.
Gas is evolved
Write the chemical reaction where the following changes are observed.
Physical state is changed
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
What do you observe when Cl2 is passed through potassium iodide (KI) solution.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
______ is not a chemical change.
________ is a chemical substance which alters the speed of a chemical reaction.
Is the conversion of milk into ice cream a chemical change?
Why is spoiling food a chemical change?
