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प्रश्न
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
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उत्तर
The basic conditions necessary for a chemical reaction is close contact .
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संबंधित प्रश्न
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
Explain the type of reactions on the basis of the direction of 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 the following chemical change.
A reaction where colour change is noticed
Explain,giving one example of the following chemical changes:
Reversible reaction
Give one example electrochemical reaction.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Is the conversion of milk into ice cream a chemical change?
Write the equation for the process of formation of rust.
Write five changes in the characteristics of a substance that can take place during a chemical change.
We are advised to not to play with fireworks. Give reason.
______ is the chemical name of limestone.
