Chemistry basic concept test mcqs

Q.1 Smallest particle of an element which may or may not have independent existence
(a) a molecule (b) an atom
(c) an ion (d) an electron
Q.2 Swedish chemist J. Berzelius determined the
(a) atomic no. (b) atomic volume
(c) atomic mass (d) atomic density
Q.3 The number of atoms present in a molecule determine its
(a) molecularity (b) basicity
(c) acidity (d) atomicity
Q.4 When an electron is added to a unipositive ion we get
(a) anion (b) cation
(c) neutral atom (d) molecule
Q.5 CO+ is an example of:
(a) free radical (b) cationic molecular ion
(c) an ionic molecular ion
(d) stable molecule
Q.6 Relative atomic mass is the mass of an atom of an element as compared to the mass of
(a) oxygen (b) hydrogen
(c) nitrogen (d) carbon
Q.7 Isotopes are the sister atoms of the same element with similar chemical properties and
(a) atomic number (b) atomic mass
(c) atomic volume (d) atomic structure
Q.8 The instrument which is used to measure the exact masses of different isotopes of an
element called
(a) I.R. Spectrophotometer (b) U.V. Spectrophotometer
(c) Mass Spectrometer (d) Colourimeter
Q.9 Mass spectrometer separates different positive isotopic ions on the basis of their
(a) mass value (b) m/e value
(c) e/m value (d) change value
Q.10 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
Q.11 Percentage of oxygen in H2O is
(a) 80% (b) 88.8%

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