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प्रश्न
Name Affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
उत्तर
SO2
APPEARS IN
संबंधित प्रश्न
Give reason .
A person suffering from acidity is advised to take an antacid.
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
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In a double decomposition precipitation reaction both the reactants must be ............ soluble.
FILL IN THE BLANK
Negatively charged ions are called ..........
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The new substances formed during a chemical reaction are called the ..................
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Explain the following reaction with one suitable example of Displacement reaction.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
When electric current is passed through acidulated water ______ of water takes place.
Give an example of the following chemical change.
A reaction where colour change is noticed
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
Circle the odd one out. Give reason for your choice
Explain the following statement: Digestion is a chemical change.
Limestone contains ______ mainly.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Analogy:
H2O: Water:: NaCl: ______.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Give two examples for each of the following cases:
Chemical changes.
