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Chapter No-1 Basic Concepts
QUESTION NO.1 Smallest particle of an element which may or may not live independently.
(a) a molecule (b) an atom
(c) an ion (d) an electron
QUESTION NO.2 Swedish chemist J. Berzelius figured out the
(a) atomic no. (b) atomic volume
(c) atomic mass (d) atomic density
QUESTION NO.3 The number of atoms present in a
molecule figure out its
(a) molecularity (b) basicity
(c) how much acid something has (d) atomicity
QUESTION NO.4 When an electron is added to a
uni positive ion we get
(a) negatively-charged ion (b) cation
(c) neutral atom (d) molecule
QUESTION NO.5 CO+ is an example of:
(a) body-damaging chemical (b) cationic molecular ion
(c) an ionic molecular ion
(d) stable molecule
QUESTION NO.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
QUESTION NO.7 Isotopes are the sister atoms of the same element with almost the same chemical properties and different
(a) atomic number (b) atomic mass
(c) atomic volume (d) atomic structure
QUESTION NO.8 The sensitive measuring device 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 Light-color meter
(d) Colorimeter
QUESTION NO.9 Mass light-color meter separates different positive isotopic ions on the basis of their
(a) mass value (b) m/e value
(c) e/m value (d) change value
QUESTION NO.10 Simplest formula that gives us information about the simple ratio of atoms in a compound is called
(a) related to what holds something together and makes it strong formula
(b) molecular formula
(c) (based on actually seeing things) formula (d) molar ratio
QUESTION NO.11 Percentage of oxygen in H2O is
(a) 80% (b) 88.8%
(c) 8.8% (d) 9.8%
QUESTION NO.12 More plentiful isotope of an element is one with
(a) even atomic no. (b) odd atomic no.
(c) Even mass no. (d) odd mass no.
QUESTION NO.13 When 0.01 kg of CaCO3 is rotten the CO2 produced occupies a total space occupied by something at S.T.P.
(a) 2.2414 dm3 (b) 22.414 dm3
(c) 22414 dm3 (d) 224014 dm3
QUESTION NO.14 The no. of covalent bond in 10gm of NH3 are
(a) 6.022 x 1023 (b) 1.062 x 1023
(c) 10.62 x 1024 (d) 1.062 x 1024
QUESTION NO.15 No. of molecules present in 10gm of water are
(a) 3.37 x 1023 (b) 33.7 x 1023
(c) 3.37 x 1024 (d) 3.037 x 1024
QUESTION NO.16 The no. of covalent forces that glue or join things together present in 10gm of water are
(a) 6.074 x 1023 (b) 6.74 x 1023
(c) 6.074 x 1024 (d) 6.74 x 1024
QUESTION NO.17 The least no. of molecules present in 30 gm of
(a) N2O (b) NO
(c) NO2 (d) N2O3
QUESTION NO.18 Which of the following has highest percentage of nitrogen
(a) (NH4)2SO4 (b) NH4H2PO4
(c) (NH4)2HPO4 (d) (NH4)3PO4
QUESTION NO.19: 0.1 mole of Na3PO4 completely separates in water to
produce Na+
(a) 6.02 x 1022 (b) 6.02 x 1023
(c) 1.806 x 1023 (d) 1.806 x 1022
QUESTION NO.20 wasting very little while working or producing something of chemical reaction can be checked by calculating
(a) amount of limiting reactant
(b) amount of the reactant in excess
(c) amount of the product formed
(d) amount of the reactant unused
QUESTION NO.21 A limiting reactant is one
(a) which is present in least amount
(b) which produces minimum no. of moles of product
(c) which produces maximum no. of moles of product
(d) does not affect the amount of product
QUESTION NO.22 Stoichiometry is the branch of chemistry which deals with the study of having to do with measuring things with numbers relationship among the different
(a) reactants (b) products
(c) Reactants and products (d) all of above
QUESTION NO.23: 500 cm3 of H2 gas at STP disagreements between things of hydrogen
(a) 6.02 x 1023 (b) 3.01 x 1022
(c) 2.68 x 1022 (d) 1.34 x 1022
QUESTION NO.24 Largest number of H+ ions are produced by complete ionization of
(a) 0.0050 mole of H2SO4 (b) 0.01 mole of HCl
(c) 0.000334 moles of H3PO4
(d) all above
QUESTION NO.25 The Avogadro’s number is
(a) 6.02 x 1024 (b) 6.02 x 10-24
(c) 6.02 x 10-23 (d) 6.02 x 1023
QUESTION NO.26 A sample of total/totally/with nothing else mixed in matter is
(a) element (b) compound
(c) substance (d) mixture
QUESTION NO.27 One calorie is equal to
(a) 4.184 J (b) 41.84 J
(c) 0.4184 J (d) 0.04184 J
QUESTION NO.28 The number of moles of CO2 which contains 8.0 gm of
oxygen
(a) 0.25 (b) 0.50
(c) 1.0 (d) 1.50
QUESTION NO.29 Mole of SO2 contains
(a) 6.02 x 1023 atoms of oxygen
(b) 18.1 x 1023 molecules of SO2
(c) 6.023 x 1023 atom of sulphar
(d) 4 gram of SO2
Important Chemistry MCQs
QUESTION NO.30 The largest number of molecules are presenting
(a) 3.6 gram of H2O (b) 4.8 gram of C2H5OH
(c) 2.8 gm of CO (d) 5.4 gms of N2O5
QUESTION NO.31 The mass of one mole of electron is
(a) 1.008 mg (b) 0.184 mg
(c) 1.673 mg (d) 0.55 mg
QUESTION NO.32 Isotopes differ in
(a) properties which depend on mass
(b) arrangements of electrons in orbital
(c) chemical properties
(d) the extent to which they may be affected in related to electricity producing magnetic fields field
QUESTION NO.33 The volume occupied by 1.4 gm of N2 at STP is
(a) 224 dm3 (b) 22.4 dm3
(c) 1.12 dm3 (d) 112 cm3
QUESTION NO.34 Many elements have fractional atomic mass. This is
because
(a) atomic masses are average masses of isobars
(b) the mass atom is itself fractional
(c) atomic masses are average masses of isotopes
(d) atomic masses are averages masses of isotopes
Important Chemistry MCQs
QUESTION NO.35 A limiting reactant is one which
(a) is taken in lesser amount in grams as compared to other reactants
(b) is taken in lesser amount in volume as compared to the other
(c) gives the most the product which is needed
(d) gives the minimum amount of the product being thought about carefully
QUESTION NO.36 Isotopes when even atomic masses are a compared to something else plentiful
(a) damper’s spectrograph is superior to that of Aston’s
(b) 0.1 mg of H2O has greater number of molecules then 0.1 mg of CH4
(c) the number of H+ and PO-3 ions are not equal but the number of positive and negative charges
(d) are equal when 100 molecules of H3PO4 are thrown more than Water
