Advertisements
Advertisements
प्रश्न
Give two examples for each of the following cases:
Chemical changes.
उत्तर
(i) Burning of paper
(ii) Curdling of milk
APPEARS IN
संबंधित प्रश्न
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
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
TRUE \ FALSE
Ammonia is a good oxidizing agent.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Write a note on the following:
Fermentation
