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प्रश्न
Write true or false :
Hydrogen sulphide has rotten egg smell .
पर्याय
True
False
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उत्तर
True
APPEARS IN
संबंधित प्रश्न
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
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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
Pressure
Define a photochemical reaction.
Give an example of the following chemical change.
Two gases combine to form white solid
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
______ gas causes tears in our eyes while cutting onions.
Which of the following is not an “element + element → compound” type 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 |
A chemical change may involve –
Is the conversion of milk into ice cream a chemical change?
Write a note on the following:
Curdling of milk
