Multiple Choice QuestionsA homogeneous mixture contains two liquids are they separated?
By filtration
By evaporation
By distillation
By condensation
Which one of the following elements forms highest numher of compounds?
Oxygen
Hydrogen
Chlorine
Carbon
20 g of common salt is dissolved in 180 g of water. What is the mass percentage of the salt in the solution?
5 %
9 %
10 %
15 %
The valency of an element depends upon the
total number of protons in an atom
mass number of an atom
total number of neutrons in an atom
total number of electrons in the outer most shell of an atom
D.
total number of electrons in the outer most shell of an atom
The valency of an element is the number of hydrogen atoms that can combine with or replace one atom of the element. In other words, the valency of an element is the number of electrons an atom of the element uses to combine with atoms of other elements it is the combining power of an atom of the element.
Match List-I with List-II and select the correct answer using the codes given below the Lists:
List I (Noble gas): (a) Argon, (b) Neon, (c) Krypton, (d) Xenon
List II (Use): (1) In lights for advertising display, (2) Airport landing lights and in light houses, (3) Light in photographer's flash gun, (4) In tungsten filament to last longer
(a) - 3, (b) - 1, (c) - 2, (d) - 4
(a) - 3, (b) - 2, (c) - 1, (d) - 4
(a) - 4, (b) - 2, (c) - 1, (d) - 3
(a) - 4, (b) - 1, (c) - 2, (d) - 3
Why is it difficult to measure the coefficient of expansion of a liquid than solid?
Liquids tend to evaporate at all temperatures
Liquids conduct more heat
Liquids expand too much when heated
Their containers also expand when heated
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