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प्रश्न
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
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उत्तर
Calcium oxide CaO
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
Fill in the blank
A new substance is always formed in a _______ change.
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
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)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
Give an example of the following chemical change.
A reaction where colour change is noticed
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
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:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
The changes in which new substance with new chemical properties are formed are ______.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Give an example of a chemical reaction for the following situation:
A change in colour is observed
Write the chemical reaction of baking soda with lemon.
Acid rain is a result of ______.
