Advertisements
Advertisements
प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
विकल्प
True
False
Advertisements
उत्तर
This statement is False.
Explanation:
Iron is a metal, while rust is iron oxide, a compound formed when iron reacts with oxygen and moisture.
APPEARS IN
संबंधित प्रश्न
Name three reducing agents ?
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 white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
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.
Which of the following is not an “element + element → compound” type reaction?
