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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, layer of zinc prevents rusting.
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संबंधित प्रश्न
The chemical name of baking soda is ______.
How do the following help in bringing about a chemical change?
heat.
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
FILL IN THE BLANK
A .............. change is a temporary change.
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
TRUE \ FALSE
Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?
How is precipitate formation in a chemical reaction indicated?
Fill in the blank
A new substance is always formed in a _______ change.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
A chemical equation is a statement that describes a chemical change in terms of
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
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)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Define a photochemical reaction.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
NPK are the primary nutrients for plants.
Write a note on the following:
Fermentation
