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प्रश्न
Fill in the blank:
The substances which undergo chemical change are called _______
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उत्तर
The substances which undergo chemical change are called reactants .
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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.
What do you observe when iron nail is kept in copper sulphate solution for sometime.
Give reason .
A person suffering from acidity is advised to take an antacid.
What are chemical reactions?
Write a short note on the information derived from a balanced chemical equation.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
A reaction between an acid and a base is called ______.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Write the equation for the process of formation of rust.
Why is spoiling food a chemical change?
______ is the chemical name of rust.
