CBSE Questions for Class 11 Medical Chemistry Classification Of Elements And Periodicity In Properties Quiz 1 - MCQExams.com

The element with configuration $$1s^2 2s^2 2p^6 3s^2$$ would be 
  • A metal
  • A non-metal
  • An inert gas
  • A metalloid
The basic character of $$MgO, SrO, K_2O$$ and $$NiO$$ increases in the order:
  • $$K_2O < SrO < MgO < NiO$$
  • $$NiO < MgO < SrO < K_2O$$
  • $$MgO < NiO < SrO < K_2O$$
  • $$K_2O < MgO < NiO < SrO$$
IUPAC symbol of atomic number $$119$$.
  • $$Uuh$$
  • $$Uun$$
  • $$Uue$$
  • $$Uub$$
The electronic configuration with the highest ionization enthalpy is:
  • $$[Ne] 3s^2\, 3p^1$$
  • $$[Ar]3d^{10}4s^2\, 4p^3$$
  • $$[Ne]3s^2\,3p^3$$
  • $$[Ne]3s^2 \, 3p^2$$
Aqueous solution of which salt will not contain ions with the electronic configuration $$1{s}^{2} 2{s}^{2} 2{p}^{6} 3{s}^{2} 3{p}^{6}$$?
  • $$KBr$$
  • $$NaF$$
  • $$NaCl$$
  • $$Ca{I}_{2}$$
The atomic numbers of elements $$A, B, C$$ and $$D$$ are $$Z-1, Z, Z+1$$ and $$Z+2$$, respectively. If $$'B'$$ is a noble gas, choose the correct answers from the following statements
(1) $$'A'$$ has higher electron affinity
(2) $$'C'$$ exists in $$+2$$ oxidation state
(3) $$'D'$$ is an alkaline earth metal
  • (1) and (2)
  • (2) and (3)
  • (1) and (3)
  • (1), (2) and (3)
The halogen with highest ionisation potential is :
  • F
  • Cl
  • Br
  • I
Identify the element with atomic number 10.
  • Neon
  • Calcium
  • Nitrogen
  • Silicon
The metal having highest ionisation potential is :
  • lithium
  • sodium
  • potassium
  • caesium
Diagonal relationship is shown by :
  • elements of first period
  • elements of second period
  • elements of third period
  • elements of fourth period
The atomic number of element Unq is:
  • $$102$$
  • $$103$$
  • $$104$$
  • $$105$$
The number of elements known in Mendeleev's presented periodic table is:
  • $$50$$
  • $$90$$
  • $$63$$
  • $$102$$
Total number of groups in Mendeleev's table are:
  • $$8$$
  • $$9$$
  • $$7$$
  • $$10$$
Eka silicon is now called as:
  • gallium
  • scandium
  • germanium
  • indium
Which of the following compound has no existence?
  • $$\mathrm{C}\mathrm{F}_{4}$$
  • $$\mathrm{X}\mathrm{e}\mathrm{F}_{4}$$
  • $$\mathrm{K}\mathrm{r}\mathrm{F}_{4}$$
  • $$\mathrm{H}\mathrm{e}\mathrm{F}_{4}$$
Which pair of elements of atomic numbers given below will have similar chemical properties?
  • $$13, 22$$
  • $$3, 11$$
  • $$4, 24$$
  • $$2, 4$$
The electron configuration of $$_{11}Na^{23}$$ is
  • $$1s^{2},2s^{2},2p^{5},3s^{2} $$
  • $$1s^{2},2s^{2},2p^{6},3s^{1} $$
  • $$1s^{2},2s^{2},2p^{4},3s^{1},3p^{2} $$
  • $$1s^{1},2s^{1},2P^{6},3s^{2},3p^{1} $$
What is the electronic configuration of neon [Atomic number=10, Atomic mass=20]?
  • $$2, 6$$
  • $$2, 7$$
  • $$2, 5$$
  • $$2, 8$$
In a group from top to bottom, ionisation energy:
  • decreases
  • increases
  • constant
  • none of these
Which of the following statements about Mendeleev's Periodic Table is incorrect?
  • He left gaps for some elements which were discovered later and correctly predicted the properties of them.
  • Inert gases could be placed in a new group without disturbing the existing order.
  • He arranged the elements according to the properties of elements.
  • The properties of the elements are the periodic function of their atomic numbers.
How did Mendeleev predict the existence of some elements yet to be discovered elements in his periodic table?
  • Gaps
  • Atomic number
  • Mass number
  • None of the above
Which of the following are the important merits of modern periodic table?
  • It explains why element in the same group have the same chemical properties.
  • Hydrogen has been placed accurately.
  • Isotopes have been placed at same position.
  • It is based on classifying elements according to their atomic number.
Which sequence of ionization potential is correct?
  • $$B < Be$$
  • $$Be < B$$
  • $$Be = B$$
  • None of the above
The trend in ionisation potential on moving down the group in the periodic table is:
  • increases
  • decreases
  • constant
  • none of these
What is the electronic configuration of lithium [ Atomic no. = 3, Mass no. = 7]?
  • $$2$$
  • $$2, 3$$
  • $$2, 2$$
  • $$2, 1$$
Example of noble gas is
  • Helium
  • Argon
  • Xenon
  • all of these
If an element X is placed in group 14, the formula its chloride is:
  • $$XCl$$
  • $$XCl_{2}$$
  • $$XCl_{3}$$
  • $$XCl_{4}$$
An inert gas with more than one orbit, has ____ electrons in its outermost shell.
  • 0
  • 2
  • 4
  • 8
Elements which have fully filled valence shell belong to :
  • halogens
  • noble gas
  • chalcogens
  • alkali
The horizontal rows in Mendleev's table were called :
  • groups
  • rows
  • periods
  • none of the above
Modern periodic law was proposed by :
  • Dmitri Mendeleev
  • Henry Moseley
  • J.A.R. Newlands
  • Niels Bohr 
The vertical columns in Mendeleev's table were called :
  • verticals
  • periods
  • columns
  • groups
The correct electronic configuration of element having mass number 24 and number of neutrons 12 is
  • 2,8,1
  • 2,8,2
  • 2,8
  • 2,8,3
The groups from $$1^{st}$$ to $$7^{th}$$ of Mendeleev's periodic table were divided into ______ subgroups.
  • $$2$$
  • $$3$$
  • $$4$$
  • $$1$$

Outermost shell cannot have more than ....... electrons.
  • 2
  • 4
  • 6
  • 8
Which of the following is the correct electronic configuration of potassium?
  • 2, 8, 9
  • 8, 2, 9
  • 2, 8, 8, 1
  • 1, 2, 8, 8
The eighth group of Mendeleev's periodic table is divided into how many subgroups?
  • $$2$$
  • $$0$$
  • $$4$$
  • $$1$$
Which periods were not divided into two series in the Mendeleev's periodic table?
  • $$4$$
  • $$5$$
  • $$6$$
  • None of the above
Which element has a dicey position in the modern periodic table?
  • Hydrogen
  • Helium
  • Argon
  • Neon
Which of the following element(s) was/were not known when Mendeleev gave his classification?
  • Germanium
  • Gallium
  • Scandium
  • All of the above
Eka-aluminium forms chloride of the type :
  • $$E_2Cl$$
  • $$ECl_3$$
  • $$E_2Cl_3$$
  • $$E_3Cl_4$$
An element with electronic configuration $$2,\,8,\,2$$ belongs to which period and group?
  • $$2,\,3$$
  • $$4,\,3$$
  • $$2,\,1$$
  • $$3,\,2$$
An atom has electronic configuration $$2,\,8,\,7$$. To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses)
  • N$$(7)$$
  • F$$(9)$$
  • P$$(15)$$
  • Ar$$(18)$$
Mendeleev used a Sanskrit numeral before the names of the predicted elements. What was the term used for it?
  • Sasi
  • Eka
  • Astan
  • Pancan
In the Modern periodic table, calcium (atomic number $$20$$) is surrounded by elements with atomic numbers $$12,\,19,\,21,\,38$$. Which of these have physical and chemical properties resembling calcium?
  • $$21$$ and $$38$$
  • $$19$$ and $$21$$
  • $$12$$ and $$19$$
  • $$12$$ and $$38$$
The electronic configuration of sulphur is :
  • $$K(2), L(8), M(6)$$
  • $$K(2), L(8), M(8)$$
  • $$K(2), L(6)$$
  • $$K(2), L(8)$$
Reactivity of elements ........ down the group.
  • increases
  • decreases
  • increases and then decreases
  • decreases and then increases
Statement I: The alkali metals have a large increase between their first and second ionization energies.
Statement II:  It takes more energy to remove an electron from a principal energy level since it is closer to the nucleus.
  • Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
  • Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.
  • Statement 1 is correct but Statement 2 is not correct.
  • Statement 1 is not correct but Statement 2 is correct.
  • Both the Statement 1 and Statement 2 are not correct.
Reactivity of elements .............. across a period.
  • increases
  • decreases
  • increases and then decreases
  • decreases and then increases
Write the electronic configuration of the element whose atomic charge and mass is 11 times and 23 times of the hydrogen.
  • $$2, 1$$
  • $$2, 8, 1$$
  • $$2, 8$$
  • $$2, 8, 8, 3$$
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