Basic Concepts - 9
1.
The instrument which is used to measure the exact masses of different isotopes of an element called.
a) Mass spectrometer
b) I.R Spectrophotometer
c) U.V Spectrophotometer
d) Colourimeter
2.
Mass spectrometer separates different positive isotopic ions on the basis of their.
a) m/e value
b) Mass value
c) Charge value
d) e/m value
3.
Simplest formula that gives us information about the simple ratio of atoms in a compound is called.
a) Structural formula
b) molecular formula
c) Empirical formula
d) molar ratio
4.
Percentage of Oxygen in H
2
O is
a) 9.8%
b) 80%
c) 8.8%
d) 88.8%
5.
More abundant isotope of an element is the one with.
a) odd atomic no.
b) even mass no
c) odd mass no.
d) Even atomic No.
6.
Large no of isotopes are known for the elements whose masses are multiple of.
a) Two
b) Six
c) Eight
d) Four
7.
When 0.01Kg of CaCO
3
is decomposed, the CO
2
produced occupies a volume at STP
a) 22414dm
3
b) 224014 dm
3
c) 2.2414 dm
3
d) 22.414 dm
3
8.
The no. of covalent bond in 10g of NH
3
are.
a) 1.062 X 10
24
b) 10.62 X 10
24
c) 1.062 X 10
23
d) 6.022 X 10
23
9.
The least no. of molecules is present in 30g of
a) NO
2
b) N
2
O
3
c) N
2
O
d) NO
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