Chemistry
Select the correct answer from the choice in bracket to complete each sentence
Dust in air is an example of …………… [heterogeneous/homogeneous] mixture.
A soluble solid is separated from an insoluble solid by …………… [fractional crystallisation / solvent extraction].
The reactive element from the two monoatomic elements is …………… [neon/silicon].
Compounds are …………… [homogeneous or heterogeneous/ always homogeneous] in nature.
An example of a monoatomic molecule is …………… [hydrogen/helium].
Elements, Compounds & Mixtures
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Answer
Dust in air is an example of homogeneous mixture.
A soluble solid is separated from an insoluble solid by solvent extraction.
The reactive element from the two monoatomic elements is silicon.
Compounds are always homogeneous in nature.
An example of a monoatomic molecule is helium.
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Related Questions
Select the correct answer from A, B, C, D & E for each statement given below:
A: Gunpowder
B: Iodine
C: Boron
D: Helium
E: Bromine
A diatomic molecule
A metalloid
A non-metal which is lustrous
A mixture consisting of elements & a compound
A noble gas
The diagram represents fractional distillation for separation of mixtures. Answer the following:
Can two immiscible liquids be separated by this process.
Separation of liquids by this process is based on which physical property.
If methyl alcohol & water are to be separated, which liquid would remain in flask 'X' after condensation.
Give a reason for the above answer.
State the purpose of the fractionating column in the apparatus.
Match the separation of components in List I with the most appropriate process in List II
List I List II 1. Naphthalene from naphthalene & sodium chloride. A: Separating funnel 2. Cream from milk B: Sublimation 3. Kerosene oil from kerosene oil & water C: Boiling 4. Lead nitrate from an aqueous solution of lead nitrate D: Centrifugation 5. Ammonia from an aqueous solution of ammonia E: Distillation Give reasons for the following statements:
Components in a mixture can be separated by physical methods only.
Centrifugation can be used for separating an insoluble heavier solid, present in an insoluble solid-liquid mixture.
The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid-liquid mixture, should be moistened before placing.
Brass & bronze are examples of mixtures, while copper sulphate & lead nitrate are examples of compound.
Zinc is considered an element, while zinc sulphide is considered a compound.