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Chemistry Class 12 Chapter 1
Periodic Classification of Elements and Periodicity
Test 9
1.
The atoms having same atomic numbers and different atomic masses are called?
Isobars
Isotropes
Isotopes
Isomers
2.
Which of the following is not a periodic property?
Coordination number of ions
Ionization energy of element
Melting point of element
Boiling point of element
3.
Ionization energy depends upon?
All of the above factors
Shielding effect
Atomic size
Nuclear charge
4.
Which of the following is stable in aqueous form?
All are stable
Cl ion
Hydride ion
Hydrogen ion
5.
Deuterium reacts with oxygen to form?
Heavy water
Soft water
Water gas
Hard water
6.
The property which increases up to the middle of the periodic table & then decreases is?
Melting & boiling points
Atomic volume
Ionization energy
Atomic radii
7.
Which discovery caused a revision in the periodic law as stated by Mendeleev?
Location of nucleus by Rutherford
X-rays by Roentgen
Natural radioactivity by Henry Becquerel
Atomic number by Moseley
8.
The atomic radii decreases by increasing atomic number in?
Elements from Li to Ne
Halogen
Alkali metal
Alkaline earth metal
9.
In which of the following pair are elements belonging to the same group?
Magnesium & Aluminum
Gallium & Helium
Boron & Beryllium
Nitrogen & Phosphorous
10.
Elements having greater numbers of electrons have value of ionization energy?
More than one
Only one
Equal to atomic number
Infinite
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