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प्रश्न
What are oxides ?
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उत्तर
An oxide is a compound which essentially contains oxygen in its molecule, chemically combined with a metal or a non-metal
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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.
Condensation of steam is not a chemical change.
How would you show that setting of curd is a chemical change?
Complete and balance the following chemical equations
Na + H2 O →
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.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Complete and balance the following reaction:
Pb(NO3)2 + KI →
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H2 and O2
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 water to quicklime.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Give a suitable example with an equation to show the representation of a chemical reaction.
______ gas causes tears in our eyes while cutting onions.
Discuss how acid rain occurs due to emission of smoke from vehicles and industries?
Burning of paper is the best example of ______ change.
Write a note on the following:
Curdling of milk
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Reason (R): Physical changes are always reversible.
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Define the following term:
Chemical change
