Chemistry 11 Chapter 1
Basic concepts
Test 15
1.
In determination of empirical formula by combustion analysis H
2
o is absorbed in?
a) Both of these
b) None of these
c) KOH
d) Mg(ClO
4
)
2
2.
Relative atomic mass of Cl is (amu)?
a) 35.453
b) 20.1797
c) 63.546
d) 15.994
3.
The formula unit mass of an ionic compound expressed in grams is called?
a) Gram mole
b) Gram formula
c) Gram atom
d) All of these
4.
Percentage of oxygen= 100- (% of carbon_____%of hydrogen)?
a) MultiplyDivide
b) Plus
c) Minus
5.
In determination of empirical formula by combustion analysis CO
2
is absorbed in?
a) KOH
b) Mg(ClO
4
)
2
c) None of these
d) Both of these
6.
Instrument used to measure the exact masses of different isotopes of an element is?
a) Mass spectrometer
b) Aerometer
c) Telescope
d) Barometer
7.
When the substance at our disposal is an element then the atomic mass of that element expressed in grams is called?
a) Gram mole
b) All of these
c) Mole
d) Gram atom
8.
Relative atomic mass of Cu is (amu)?
a) 63.546
b) 15.994
c) 20.1797
d) 35.453
9.
Molecular mass/ empirical formula mass = ____?
a) n
b) C
c) m
d) l
10.
Relative atomic mass of U is (amu)?
a) 272.236
b) 238.0289
c) 63.546
d) 20.1797
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