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प्रश्न
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
उत्तर
The reaction between copper sulphate and iron metal – blue solution of copper sulphate changes to the green solution of ferrous sulphate.
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संबंधित प्रश्न
Give reason.
Acidic soil is treated with quick lime.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
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.
Write the chemical reaction where the following changes are observed.
Colour change is noticed
State the main characteristics of chemical reactions. Give at least one example in each case.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Write the equation for the process of formation of rust.
______ is the chemical name of rust.
