CBSE Questions for Class 11 Medical Chemistry Classification Of Elements And Periodicity In Properties Quiz 10 - MCQExams.com

Correct order of polarizing power is 
  • $$Be^{+2} > Mg^{+2} > Ca^{+2} > K^+$$
  • $$Be^{+2} > Ca^{+2} > Mg^{+2} > K^+$$
  • $$Mg^{+2} > Ca^{+2} > Be^{+2} > K^+$$
  • $$Mg^{+2} > Be^{+2} > Ca^{+2} > K^+$$
Element A and B with their respective electronic configurations $$3d^{10}4s^{1}$$ and $$4d^{10}5s^{1}$$ in their outermost shell are 
  • Both coinage metals
  • Both non-metals
  • A is a non-metal and B is coinage metal
  • A is a coinage metal and B is non-metal
Electronic configuration of chalcogens in their outermost orbit is 
  • $${s^2}{p^3}$$
  • $${s^2}{p^5}$$
  • $${s^2}{p^4}$$
  • $${s^2}{p^6}$$
The metal showing resemblance with lithium is
  • $$Be$$
  • $$Mg$$
  • $$Al$$
  • $$Ca$$
Mark the group which has maximum number of element in Mendeleev's periodic table:
  • $$I$$
  • $$II$$
  • $$III$$
  • $$IV$$
When burned, sulfur forms a gaseous product X which can be oxidised to produce a gas Y. Gas Y reacts with water to produce a product Z.
Which row correctly shows the oxidation states of sulfur in X, Y and Z?

XYZ
A$$-2$$$$+4$$$$+4$$
B$$-2$$$$+4$$$$+6$$
C$$+4$$$$+6$$$$+4$$
D$$+4$$$$+6$$$$+6$$
  • A
  • B
  • C
  • D
Metal T reacts with water to produce a colourless solution. A white precipitate is produced when this colourless solution is mixed with aqueous sulfuric acid. What is metal T?
  • Barium
  • Magnesium
  • Potassium
  • Sodium
For the element sulfur, which pair of ionisation energies has the largest difference between them?
  • Third and fourth ionisation energies
  • Fourth and fifth ionisation energies
  • Fifth and sixth ionisation energies
  • Sixth and seventh ionisation energies
Which metals upon heating in presence of air followed by hydrolysis gives Ammonia?
  • $$Li, K$$
  • $$Rb, Mg$$
  • $$Li, Mg$$
  • $$Ca, K$$
Which pair of elements will react together most violently?
  • Chlorine and lithium
  • Chlorine and potassium
  • Iodine and lithium
  • Iodine and potassium
What is product of reaction between $$Ba(OH)_2$$ dilute solution with $$H_2O_2+ClO_2$$?
  • $$HOCl$$
  • $$Ba(OCl)_2$$
  • $$Ba(ClO_3)_2$$
  • $$Ba(ClO_2)_2$$
The electronic structure $$(n-1)d^{1-10}ns^{0-2}$$ is characteristic of 
  • Transition elements
  • Lanthanides
  • Actinides
  • Rare gases
Which of the following is a formula of methanides : (a) $$Be_{2}C$$ (b) $$CaC_{2}$$ (c) $$Mg_{2}C_{3}$$ (d) $$Al_{4}C_{3}$$.
  • Only $$a, d$$
  • Only $$a, b$$
  • Only $$c, d$$
  • Only $$b, d$$
Consecutive elements X, Y and Z are in Period $$3$$ of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point of these three elements.
What are the identities of X, Y and Z?
  • Sodium, magnesium, aluminium
  • Magnesium, aluminium, silicon
  • Aluminium, silicon, phosphorus
  • Silicon, phosphorous, sulfur
Which statements about Group I and Group VII elements are correct?
In Group I, lithium is more reactive than potassium.
In Group VII, chlorine is more reactive than fluorine.
  • Statement $$1 - \checkmark$$, statement $$2 - \checkmark$$
  • Statement $$1 - \checkmark$$, statement $$2 - X$$
  • Statement $$1 - X$$, statement $$2 - \checkmark$$
  • Statement $$1 - X$$, statement $$2 - X$$
Select the correct order of first ionization potential :
  • $$ O^{2+}_2 > O_2 $$
  • $$ O^{2+}_2 < O_2 $$
  • $$ O_2 = O_2^{2+} $$
  • None of these
Which element has the highest first ionization potential?
  • N
  • Ne
  • He
  • H
  • Li
Select the correct order of first ionization potential:
  • $$ O_2 > NO $$
  • $$ O_2 < NO $$
  • $$ O < NO $$
  • $$ O= NO $$
In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle filling of a new energy shell. In accordance with the Aufbau principle, the seven period (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f - block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table..
The electronic configuration of the elements which is just above the elements with atomic number 43 in the same group is ____
  • $$1s^22s^22p^63s^23p^63d^54s^2$$
  • $$1s^22s^22p^63s^23p^63d^54s^24p^6$$
  • $$1s^22s^22p^63s^23p^63d^64s^2$$
  • $$1s^22s^22p^63s^23p^63d^74s^2$$
Select the correct order of first ionization potentials:
  • $$ N_2 >O_2 $$
  • $$ N_2 > O $$
  • $$ O > O_2 $$
  • $$ O_2 =N_2 $$
The electronic structure of zinc $$(Z=30)$$ is $$2,8,18,2.$$ The electronic structure of gallium $$(Z=31)$$ will be
  • $$2,8,18,2,1$$
  • $$2,8,19,2$$
  • $$2,8,18,3$$
  • $$2,8,19,3$$
In group IA of alkali metals, the ionization potential decreases down the group. Therefore, lithium is a poor reducing agent.
  • True
  • False
Diagonal relationship in periodic table is shown by elements of _____ and _____ periods: 
  • I and II
  • II and III
  • III and IV
  • I and III
Which of the following electronic configuration represents most electropositive element?
  • $$ [He] 2s^1 $$
  • $$ [He] 2s^2 $$
  • $$ [Xe] 6s^1 $$
  • $$ [Xe] 6s^2 $$
 Ionisation enthalpy in the alkali group: 
  • increases from Li to Cs
  • decreases from Li to Cs
  • remains the same
  • bears no gradation
Which of the following elements has the lowest ionisation enthalpy? 
  • H
  • Cs
  • He
  • Fr
The incorrect statement among the following is:
  • The first ionisation potential of Al is less than the first ionisation potential of Mg
  • The second ionisation potential of Mg is greater than the second ionisation potential of Na
  • The first ionisation potential of Na is less than the first ionisation potential of Mg
  • The third ionisation potential of Mg is greater than third ionisation potential of Al
The most predominantly electrovalent compounds will be obtained from the combination of elements belonging to:
  • I and VII groups
  • II and VI groups
  • III and V groups
  • None of these
Which of the following configurations represents atoms of element having a large difference between first and the second ionisation energy ?
  • $$ 1s^22s^2 2p^4 $$
  • $$ 1s^2 2s^2 2p^6 $$
  • $$ 1s^22s^2 2p^63s^1 $$
  • $$ 1s^22s^2 2p^63s^2 $$
Element with atomic number $$35$$ belongs to:
  • $$3^{rd}$$ period
  • $$18^{th}$$ group
  • $$5^{th}$$ period
  • $$17^{th}$$ group
Which of the following has the lowest ionisation enthalpy?
  • $$ 4s^1 $$
  • $$ 3d^2 $$
  • $$ 3p^6 $$
  • $$ 2p^6 $$
Which of the following elements  has the lowest ionistion enthalpy?
  • Na
  • K
  • Mg
  • AI
On the basic of electronic configuration the known elements are grouped in:
  • $$3-$$ block
  • $$2-$$ block
  • $$4-$$ block + lanthanides
  • $$3$$ block + lanthanides + actinides
Which of the outer electronic configuration represents argon?
  • $$ns^2$$
  • $$ns^2 np^2$$
  • $$ns^2 np^4$$
  • $$ns^2 np^6$$
Which of the following represents the same element? 
  • 105
  • unnilpentium
  • Ha
  • Rf
Which of the following has maximum ionisation enthalpy? 
  • K
  • Na
  • Mg
  • Be
How many unpaired electrons are present in the central metal ion of $$[CoCl_4]^{2-}$$?
  • $$5$$
  • $$4$$
  • $$3$$
  • $$2$$
Elements A, B, C, D and E have the following electronic configurations: 
(A) $$ 1s^2 , 2s^2 ,2p^1 $$
(B) $$ 1s^2, 2s^22p^6, 3s^2 3p^1 $$
(C) $$ 1s^2, 2s^2 2p^6,3s^3p^3 $$
(D) $$ 1s^2 , 2s^2 2p^6 , 3s^2 3p^5 $$
(E) $$ 1s^2, 2s^2 2p^6 ,3s^23p^6 , 4s^1 $$ 

The elements which belong to the same group of the periodic table are: 
  • A and C
  • A and B
  • A and D
  • A and E
Which of the following orders is wrong ?
  • $$ NH_3 < PH_3 < AsH_3 $$ -Acidic
  • $$ Li < Be < B < C - IE_1 $$
  • $$ AI_2O_3 < MgO < Na_2O < K_2O $$ - Basic
  • $$ Li^+ < Na^+ < K^+ < Ca^+ $$ - ionic radius
$$K_2Al(C_2O_4)_3$$ is called:
  • potassium aluminium oxide
  • potassium aluminium $$(III)$$ trioxalate
  • potassium trioxatatoaluminate $$(III)$$
  • potassium tris (oxalato) aluminium
Which configuration represents a noble gas
  • $$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2$$
  • $$1s^2 2s^2 2p^6 3s^2 3p^6$$
  • $$1s^2 2s^2 2p^6 3p^6$$
  • $$1s^2 2s^2 2p^6 3s^2$$
Which metal has $$2$$ electrons in the outermost orbit
  • $$Na$$
  • $$Cu$$
  • $$Au$$
  • $$Be$$
Which of the following pair has elements containing same number of electrons in the outermost orbit
  • $$N, O$$
  • $$Na, Ca$$
  • $$As, Bi$$
  • $$Pb, Sb$$
Consider the electronic configuration for neutral atoms,
(A) $$1s^{2},2s^{2}2p^{6},3s^{1}$$
(B) $$1s^{2}, 2s^{2}2p^{6},3s^{2}3p^{6},4s^{2}$$
(C) $$1s^{2},2s^{2}2p^{6},3s^{2}3p^{5}$$
Which of the following statement are true?
  • $$(A)$$ and $$(B)$$ are metals while $$(C)$$ is a nonmetal
  • $$(A)$$ and $$(B)$$ are $$s-$$ block elements while $$(C)$$ is a $$p-$$ block element
  • The $$I.P$$ of $$(A)$$ is higher than $$I.P$$ of $$(C)$$
  • $$(A), (B)$$ and $$(C)$$ are representative elements
Which of the following represents the same elements?
  • $$106$$
  • unnilhexium
  • $$Ha$$
  • $$Sg$$ (seaborgium)
Consider the following statements 
(I) Rutherford name was associated with the development of periodic table.
(II) A metal  M  having electronic  configuration  $$ 1 s^{2}$$, $$  2 p^{6}$$,  $$ 3 s^{2}$$ ,$$ 3 p^{6}$$ , $$ 3 d^{10}$$ , $$ 4 s^{1}$$  is  d-block element.
(III) Diamond is not an element.
(IV) The electronic configuration of  the most electronegative  element is $$ 1 s^{2}$$  , $$ 2s^{2}$$ , $$ 2 p^{6}$$ 

 Select the correct option from the  given codes
  • i ,ii iv
  • i, ii, iii ,iv
  • ii ,iv
  • i, iii, iv
The atomic number of vanadium, chromium, manganese and iron are respectively $$23, 24, 25$$ and $$26$$. Which one of these may be expected to have the highest second ionisation energy?
  • $$V$$
  • $$Cr$$
  • $$Mn$$
  • $$Fe$$
Consider the following statements and arrange in the order of true/false as given in the  codes 
 $$S_{1}:-$$ in the modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that subshell 
$$S_{2}:-$$ The greatest increase in ionization enthalpy is  experienced on the removal of an electron from core noble gas configuration 
$$S_{3}:-$$ The size of the isoelectronic  species is effected by electron interaction in the outer orbitals 
$$S_{4}:-$$ Anything that influences the  valence electrons will affect the chemistry  of the  element and the valence  shell is not affected by nuclear mass 
  • F F T T
  • T T F T
  • F T F T
  • T T T T
An atom of an element has electronic configuration $$2,8,1$$. Which of the following statement is correct
  • The element's valency is $$7$$
  • The element exists as a diatomic molecule
  • The element is of non-metallic nature
  • The element forms a basic oxide
Which of the following statement is not correct for the element having electronic configuration $$1s^{2} 2s^{2} 2p^{6} 3s^{1}$$
  • It is a monovalent electropositive
  • It forms basic oxide
  • It is a non-metal
  • It has low electron affinity
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