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प्रश्न
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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उत्तर
During a chemical reaction transfer of energy takes place.
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron pipes coated with zinc do not get rusted easily.
How do the following help in bringing about a chemical change?
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
State four conditions necessary for chemical reactions to take place.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Explain by writing a word equation.
Respiration is a chemical change.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Define a photochemical reaction.
Give an example of the following chemical change.
Two gases combine to form white solid
Name the gases which turn moist red litmus blue.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Give a suitable example with an equation to show the representation of a chemical reaction.
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
_____ is the basic material to manufacture urea.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
The chemical formula of rust is ______.
Write the characteristics of chemical change.
