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प्रश्न
Fill in the blank
A new substance is always formed in a _______ change.
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उत्तर
A new substance is always formed in a chemical change.
APPEARS IN
संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
TRUE \ FALSE
Copper can displace iron from iron sulphate.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
State what you would observe when the following substance is heated in a glass test tube red lead.
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Give an example of a reaction where the following are involved
Pressure
Give an example of a reaction where the following are involved
Catalyst
Give an example of the following chemical change.
Two gases combine to form white solid
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
What do you observe? When
Sodium chloride solution is added to silver nitrate solution.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Complete the table given below.
| Addition of dil. H2SO4 to zinc | Test for gas evolved |
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
A chemical change may involve –
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Write five changes in the characteristics of a substance that can take place during a chemical change.
