Advertisements
Advertisements
प्रश्न
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Advertisements
उत्तर
Chlorine gas, iron powder, iodine vapour and sulphur powder. aluminum foil, graphite and diamond are not compounds.
APPEARS IN
संबंधित प्रश्न
Define the term matter. What is it composed of?
All kinds of matter
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Name a metal which is soft and a non-metal which is hard.
Which type of elements, metals or non-metals, show the property of brittleness ?
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
The best way to recover sugar from an aqueous sugar solution is :
Which one of the following scrap metal cannot be separated by magnetic separation ?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Which statement is not correct for a mixture
