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Question
Name: A greenish-yellow gas.
Solution
Chlorine
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RELATED QUESTIONS
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
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Negatively charged ions are called ..........
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In a ............ change, new substances are formed.
Define chemical reaction.
Write true or false :
Hydrogen sulphide has rotten egg smell .
State four conditions necessary for a chemical reaction to take place.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
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)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Give an example of a reaction where the following are involved:
Close contact
What do you understand by precipitation reaction? Explain with examples.
What do you understand by 'chemical reaction'?
What do you observe? When
Barium chloride is added to sodium sulphate solution
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
What is the role of a catalyst in a chemical reaction?
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
