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प्रश्न
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
पर्याय
No chemical change
Decomposition of AB and CD
Exchange of ions of AB and CD
Combination of AB and CD
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उत्तर
Exchange of ions of AB and CD
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संबंधित प्रश्न
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
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
Define a photochemical reaction.
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
What is a chemical reaction?
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Write the characteristics of chemical change.
