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7th ICSE
IMPORTANT
Earn 100

The formula of caustic soda.

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Important Questions on Elements, Compounds & Mixtures

MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 2
The ideal method to separate iodine & KCl.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 2
A homogeneous mixture.
HARD
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 3
Match the ideal method of separation of components in a mixture in List I with the appropriate process in List II.
List I List II
1. Sand from a mixture of sand & water a. Separating funnel
2. Kerosene from a mixture of kerosene & water b. Sublimation
3. Alcohol from a mixture of methyl alcohol & water c. Filtration
4. Naphthalene from a mixture of naphthalene & lead
chloride		 d. Distillation
5. Pure water from impure water e. Fractional
distillation
HARD
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 4
If fractional distillation is carried out using a liquid-liquid mixture, one liquid will remain in the flask & the other will be collected in the receiver. Give the reason for this statement.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 4
Evaporation of a common salt solution or sea water, leaves behind common salt inside the evaporating dish after heating. Give the reason for this statement.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 4
Components in a mixture are present in varying proportions and not in a fixed proportion. Give reason for this statement.
MEDIUM
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 4
Gunpowder is an example of a heterogeneous mixture. Give the reason for this statement.
HARD
7th ICSE
IMPORTANT
Simplified Chemistry>Chapter 3 - Elements, Compounds & Mixtures>OBJECTIVE TYPE QUESTIONS>Q 4

In chromatography, the absorbent medium e.g. Whatman filter paper is known as the - stationary phase. Give reason for this statement.