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प्रश्न
______ gas causes tears in our eyes while cutting onions.
उत्तर
Propanethial s-oxide gas causes tears in our eyes while cutting onions.
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संबंधित प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
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
Name three reducing agents ?
True or false
New substances are formed in a chemical change.
Define chemical reaction.
Explain the following reaction with one suitable example of Combination reactions .
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
Heat
Write the chemical reaction where the following changes are observed.
Precipitate is formed
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
Photosynthesis is a chemical reaction that takes place in the presence of ______.
Mention the various conditions required for a chemical reaction to occur.
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 |
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
The reaction of H2 gas with oxygen gas to form water is an example of ______.
