chemistry XI chapter 1 practice questions
CHEMISTRY CHAPTER 1 PRACTICE
QUESTIONS
Q1. .
Iodine reacts with chlorine to
form two inter halogen compounds, iodine monochloride and iodine trichloride,
according to the following reaction:
I2 + Cl2→ICl
+ ICl3
In the solid state, iodine
trichloride dimerizes and forms a dimer I2Cl6. The
solid decomposes to give ICl and Cl2 when heated. The reaction is
as follows:
ICl3 →ICl + Cl2.
|
How many molecules of ICl3 are
formed when 127 g of iodine is completely reacted with 71 g of chlorine?
Q2.
Use the following information to
answer the next question.Calcium
carbonate (CaCO3) decomposes to produce calcium oxide and carbon
dioxide according to the following reaction:
CaCO3 → CaO + CO2
|
How many molecules of carbon dioxide
can be obtained by the decomposition of 24 g of calcium carbonate at STP?
Q3.
Use the following information to
answer the next questionAmmonia is
oxidized, catalytically, into nitric oxide in the presence of platinum. The
reaction is as follows:
NH3 + O2 →
NO + H2O
|
What amount of nitric oxide can be
obtained by reacting 12 g of oxygen with 12 g of ammonia?
Q4.
Use the following information to answer
the next question.When sulfides of copper are
roasted, poisonous sulfur dioxide (SO2) gas is produced according
to the following reaction:
Cu2S + O2 →
2Cu + SO2.
This sulfur dioxide, when released
into atmosphere, gets converted into sulfuric acid.
|
What amount of sulfur dioxide will
be released when 39.5 g of copper sulfide is roasted in excess of oxygen?
Q5.
Use the following information to
answer the next questioNitrogen
reacts with hydrogen to give ammonia according to the following reaction:
N2 (g)
+ 3H2 (g) → 2NH3 (g)
|
What amount of hydrogen is required
to react completely with 6 grams of nitrogen?
Q6.
Use the following information to
answer the next question.Citral (C10H16O)
is a major constituent of the oil of lemongrass. It is an aroma compound,
which is used in perfumeries for its citrus effect. It is also used as a
flavour.
The molecular mass of citral is
152 gmol-1.
|
What is the mass ratio of oxygen to
carbon in citral?
Q7.
What quantity of calcium phosphate
[Ca3 (PO4)2] will contain 12 × 1024 atoms
of oxygen?
Q8.
The formation of water is an
exothermic reaction as it produces a tremendous amount of energy. It is also
an example of combustion reaction, wherein a substance combines with oxygen.
Hydrogen reacts with oxygen to form water in the following manner:
2H2 + O2 →
2H2O + Energy
|
How many moles of water are obtained
when four moles of hydrogen react with two moles of oxygen?
Q9.
A particular chemical compound
contains 5 per cent hydrogen, 60 per cent oxygen, and 35 per cent nitrogen.
This compound is commonly used as a fertilizer.
Its molecular mass is 80 gmol−1.
|
The number of atoms of nitrogen in
the molecular formula of the compound is
Q10.
A chemical compound contains 18 per
cent cobalt, 5.96 per cent nickel, and 76.04 per cent arsenic. The number of
atoms of arsenic, in the empirical formula of the compound is
Q11.
The mass (in grams) of one mole of
atoms in a monatomic element is referred to as the gram atomic mass of that
element.
|
Which of the following quantities
weighs the maximum?
Q12.
What is the percentage of sulfur in
sulfuric acid (H2SO4)?
Q13.
Chloromethane (CH3Cl)
is a clear and colourless gas that has a faint and sweet odour. This is
noticeable only at toxic levels.
|
What is the percentage of chlorine
in chloromethane?
Q14.
Lead nitrate reacts with sodium
iodide to give lead iodide and sodium nitrate in the following manner:
Pb(NO3)2 +
2NaI → PbI2 + 2NaNO3
|
What amount of sodium nitrate is
obtained when 30 g of lead nitrate reacts with 30 g of sodium iodide?
Q15.
Sulfur dioxide reacts with oxygen
to form sulfur trioxide in the following manner:
2SO2 + O2 →
2SO3
|
If 0.5 mole of sulfur dioxide is
mixed with 0.5 mole of oxygen, then how many moles of sulfur trioxide can be
obtained?
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