Below are the Chemistry MCQs 2024 for test:
Periodic Table & Periodicity of Properties important MCQs:
1➤ The atomic radii of the elements in periodic table:
ⓑ Increase from top to bottom in a group.
ⓒ Do not change from left to right in a period.
ⓓ Decrease from top to bottom in a group.
2➤ The amount of energy given out when an electron is added to an atom is called:
ⓑ lonization energy
ⓒ Electronegativity
ⓓ Electron affinity
3➤ Mendeleev's Periodic Table was based upon the:
ⓑ Atomic mass
ⓒ Atomic number
ⓓ Completion of a subshell
4➤ Long form of periodic table is constructed on the basis of:
ⓑ Atomic mass
ⓒ Atomic number
ⓓ Mass number
5➤ 4th and 5th period of the long form of periodic table are called:
ⓑ Normal periods
ⓒ Long periods
ⓓ Very long periods
6➤ Which one of the following halogen has lowest electronegativity?
ⓑ Chlorine
ⓒ Bromine
ⓓ Iodine
7➤ Along the period, which one of the following decreases?
ⓑ lonization energy
ⓒ Electron affinity
ⓓ Electronegativity
8➤ Transition elements are:
ⓑ all metals
ⓒ all nonmetals
ⓓ all metalloids
9➤ Mark the incorrect statement about ionization energy:
ⓑ It is absorption of energy.
ⓒ It decreases in a period.
ⓓ It decreases in a group.
10➤ Point out the incorrect statement about electron affinity:
ⓑ It involves release of energy.
ⓒ It decreases in a period.
ⓓ It decreases in a group
11➤ The arrangement of elements in groups and periods on the basis of their properties is called:
ⓑ Periodic law
ⓒ Periodicity
ⓓ Period
12➤ Who observed relationship between atomic masses of several groups of three elements called triads?
ⓑ Newlands
ⓒ Mendeleev
ⓓ Moseley
13➤ In triads, the central elements had------------- average of the other two elements.
ⓑ Atomic masses
ⓒ Proton number
ⓓ Number of isotopes
14➤ In 1864, British chemist Newlands put forward his observation in the form of law of:
ⓑ Octaves
ⓒ Averages
ⓓ Masses
15➤ Which elements were not discovered in Newland's time?
ⓑ Transition Elements
ⓒ Alkali metals
ⓓ Alkaline Earth metals
16➤ Who created first version of periodic table?
ⓑ Doberiener
ⓒ Newland
ⓓ Mendeleev
17➤ According to Mendeleev's periodic law, properties of the elements are the periodic function of their:
ⓑ Atomic radii
ⓒ Atomic masses
ⓓ Electronegativities
18➤ Mendeleev's periodic table could not explain the position of:
ⓑ Non metals
ⓒ Gases
ⓓ Isotopes
19➤ Who described modern periodic law?
ⓑ Mosely
ⓒ Debrieren
ⓓ Newland
20➤ According to modern periodic law, properties of the elements are the periodic function of their:
ⓑ Atomic masses
ⓒ Atomic sizes
ⓓ Physical properties
21➤ Atomic number of every element is:
ⓑ Variable
ⓒ Same
ⓓ Relative
22➤ Who introduced the name of periodic table?
ⓑ Mosely
ⓒ Mendeleev
ⓓ Bohr
23➤ Vertical columns present in the periodic table are called:
ⓑ Periods
ⓒ Triads
ⓓ Octaves
24➤ Horizontal rows present in the periodic table are called:
ⓑ Periods
ⓒ Tables
ⓓ Triads
25➤ Which of the following tells us about the number of electrons present in the outermost shell of an atom?
ⓑ Period number
ⓒ Atomic number
ⓓ Mass number
26➤ Which of the following tells us about the number of electronic shells present in the atoms?
ⓑ Period number
ⓒ Atomic number
ⓓ Mass number
27➤ The number of groups in modern periodic table is:
ⓑ 16
ⓒ 17
ⓓ 18
28➤ The number of periods in modern periodic table is:
ⓑ 8
ⓒ 9
ⓓ 10
29➤ How many blocks are present in modern periodic table?
ⓑ 3
ⓒ 4
ⓓ 5
30➤ Elements which belong to s and p blocks are called:
ⓑ Transition elements
ⓒ Noble gases
ⓓ Metals
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