question_answer1)
Give the difference between a cation and an
anion.
question_answer2)
Write the chemical formula of the compound zinchydroxide.
question_answer4)
Calculate the formula unit mass of 
.
[Atomic mass of Na =23 u, C =12u, O = 16 u]
question_answer5)
Give an example of a triatomic molecule of anelement.
question_answer6)
Which number is represented by 1 mole?
question_answer7)
Calculate the number of moles in 71g of chlorine.[Atomic
mass of Cl = 35.5]
question_answer8)
An element Z has a valency of 3. What is theformula of oxide of Z?
question_answer9)
Calculate the molecular mass of
.
[Atomic mass of H=1u,S=32u, O =16u]
question_answer11)
Calculate the molar mass of sugar
[Atomic mass of C =12u, O =16u, H=1u]
question_answer12)
Define atomicity.
question_answer13)
How many atoms are present in onemolecule of ozone?
question_answer14)
Write the names of the followingcompounds.
(a)
(b)
question_answer15)
Name the metal which is used formaking pressure cooker and aeroplane.
question_answer16)
What is an atom?
question_answer17)
What is a molecule?
question_answer18)
What is the law of constant proportions?
question_answer19)
What is the formula of calcium sulphate?
question_answer20)
Which is an ionic compound among 
and
?
question_answer21)
What is the chemical symbol for nitrogen sgas?
question_answer22)
What is the chemical symbol for sodium?
question_answer23)
Is argon monoatomic or diatomic?
question_answer24)
What is the value of Avogadro's constant?
question_answer25)
What is the chemical symbol for hydrogen gas?
question_answer27)
How many litres do 
and
at STP
contain?
question_answer28)
Which is octa-atomic, carbon or sulphur?
question_answer29)
Which of these contains more number of molecules; 1 g of
or 1g of
?
question_answer30)
Which element is considered as the lightest element?
question_answer31)
What is the mass of sodium in 58.5 g of NaCI?
question_answer32)
What is the chemical formula of ammoniumphosphate?
question_answer33)
What is the combining capacity of an element called?
question_answer34)
What is the molecular formula of aluminium hydroxide?
question_answer35)
What are the correct formulae of sodium sulphide and sodium sulphite
:NaS, 
or
?
question_answer37)
How many moles does 24 g of Mg contain?
question_answer38)
Which among the following is the correct symbol of gold-Gd, Gl or Au?
question_answer39)
How many litres does 2 moles of gas
at STP contain?
question_answer40)
What is the molecular weight of
question_answer41)
What is the formula unit mass of 
?
question_answer42)
Which is a true triatomic molecule among these?
, or 
?
question_answer43)
What is the molar mass of 
?
question_answer44)
Calculate the mass of
3.011 x 1023 N atoms.[Atomic mass of nitrogen = 14]
question_answer46)
Calculate
the mass of 1 molecule of oxygen gas. [Atomic mass of 0 = 16u,
]
question_answer47)
(a) Write
the formula of the compound formed by the ions 
and
.
question_answer49)
An element Y
has a valency of 4 write the formula for its
question_answer50)
What is the
fraction of the mass of water due
to neutrons?
question_answer53)
The mass of
a single atom of an element is
Calculate its
atomic mass.
question_answer58)
What is an
ion? Write the symbol of calcium ion and aluminium ion.
question_answer60)
If 12 g of C
is burnt in the presence of 32 g of 
, how much 
will be formed?
question_answer61)
Calculate
the number of moles in 8.5 g of
. [Atomic mass
of N = 14, H = 1]
question_answer64)
What are the
two laws under the law of chemical combination?
question_answer66)
Which law is
also known as law of definite composition? Also state the law.
question_answer67)
What is the
difference between sodium atom and sodium ion?
question_answer68)
Name some
elements which show variable valencies.
question_answer69)
Which law is
also known as law of indestructibility of matter? Why?
question_answer71)
How do
molecules exist in a chemical reaction?
question_answer72)
Write the
chemical formulae of
(a) calcium
hydroxide (b) potassium sulphate
question_answer73)
Calculate
the mass of one atom of oxygen.
(Atomic mass of O =
16u)
question_answer74)
Convert 10g
of oxygen gas into moles.
(Atomic mass of O =
16 u)
question_answer95)
Calculate
the number of molecules of sulphur
present in 32
g of solid sulphur.
question_answer96)
Calculate
the number of aluminium ion present in 2 g of aluminium oxide.
question_answer97)
Find out the
percentage composition of sulphuric acid
question_answer101)
12 g of He
is equal to how many atoms?
question_answer102)
Which would
weigh the more, 2 moles of
or 10 moles
of 
?
question_answer103)
Which has
more number of atoms, 18 g of or 18 g of
?
question_answer109)
What are
ionic and molecular compounds?
Give examples.
question_answer132)
What are the
important features of Dalton' s atomic theory?
question_answer136)
Name
the Indian philosopher who proposed the theory of matter.
question_answer137)
What
is Dalton?
question_answer142)
Why
is it not possible to see an atom with naked eyes?
question_answer143)
Give
an example of a triatomic molecule of an element.
question_answer144)
Define
atomicity.
question_answer145)
Write
the atomicity of the following molecules:
(i) 
(ii)
question_answer146)
What
is the difference between 
and 2H?
question_answer147)
What
is an ion? Give one example.
question_answer150)
What
is wrong in saying 'one mole of nitrogen'?
question_answer151)
What
is meant by the term chemical formula?
question_answer155)
Valency
of an element X is 3. Write the chemical formula of its oxide.
question_answer156)
How
many times heavier is one atom of carbon than one atom of oxygen?
question_answer159)
Write
chemical formulae of (i) Hydrogen sulphide (ii) Iron (II) chloride.
question_answer166)
We
cannot say an atom of water. Why?
question_answer167)
Which
of the following are tri-atomic and tetra-atomic molecules?
question_answer169)
How
many atoms are present in a (i) 
molecule and (ii)
ion?
question_answer174)
Write
the formula of the compounds formed by the following ions.
(a) 
and
(b)
and
question_answer175)
Calculate
the molecular mass of the following:
(a) 
(b) 
(c) 
question_answer176)
Differentiate
between the actual mass of a molecule and gram molecular mass.
question_answer177)
Calculate
the formula mass of sodium carbonate 
question_answer179)
23. Calculate
the mass of one atom of hydrogen atom.
question_answer180)
What
are ionic and molecular compounds? Give examples.
question_answer182)
Calculate
the number of molecules present in 0.5 mole of water.
question_answer183)
Calculate
the number of molecules of sulphur 
present in 16 g of
solid sulphur.
question_answer184)
Give
three significance of mole.
question_answer186)
How
many moles are present in 4 g of sodium hydroxide?
question_answer192)
Calculate
the number of moles in 3.011 X 1023 molecules of nitrogen.
question_answer200)
Calculate
the number of aluminium ions 
in 0.056 g of
alumina
question_answer203)
Find
the ratio of mass of the combining elements in the following compounds:
question_answer208)
Compute
the number of ions present in 5.85 g of sodium chloride.
question_answer217)
What
is the fraction of the mass of water due to neutrons?
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[Atomic mass of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, 0 = 16 u]
