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प्रश्न
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.
उत्तर
Rusting of iron is a slow chemical change.
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
pressure.
How do the following help in bringing about a chemical change?
catalyst .
Fill in the blank
A new substance is formed in a _______ change.
Write true or false :
Hydrogen sulphide has rotten egg smell .
What do you observe when H2S is passed through a lead nitrate solution.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
