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Science M.C.Q

Periodic Classification of Elements · MP Board (MPBSE) STD 10 (Madhya Pradesh - English Medium). 183 questions.

Questions · Page 4 of 4

M.C.Q

MCQ 1511 Mark
The correct order of increasing acidic nature of $\mathrm{SO}_2, \mathrm{SiO}_2, 2 \mathrm{O}_3$ and $\mathrm{Al}_2 \mathrm{O}_3$ is.
  • ✓
    $\mathrm{Al}_2 \mathrm{O}_3<\mathrm{SiO}_2 2 \mathrm{O}_3<\mathrm{SO}_2$.
  • B
    $\mathrm{SO}_2<\mathrm{P}_2 \mathrm{O}_3<\mathrm{SiO}_2<\mathrm{Al}_2 \mathrm{O}_3$.
  • C
    $\mathrm{SiO}_2 \mathrm{Al}_2 \mathrm{O} 3<<\mathrm{P}_2 \mathrm{O}_3<\mathrm{SO}_2$.
  • D
    $\mathrm{SiO}_2 2 \mathrm{O}_3<\mathrm{P}_2 \mathrm{O}_3$.
Answer
Correct option: A.
$\mathrm{Al}_2 \mathrm{O}_3<\mathrm{SiO}_2 2 \mathrm{O}_3<\mathrm{SO}_2$.
While moving along a group from top to bottom, acidic nature of oxides decreases and along a period from left to right, acidic nature increases.
$\mathrm{Al}_2 \mathrm{O}_3$ is amphoteric. $\mathrm{SiO}_2$ is slightly acidic whereas $\mathrm{P}_2 \mathrm{O}_3$ and $\mathrm{SO}_2$ are the anhydrides of the acids $\mathrm{H}_3 \mathrm{PO}_3$ and $\mathrm{H}_2 \mathrm{SO}_3$.
${\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\text{Al}}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Si}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{P}\ \ \ \ \ \ \ \ \ \ \text{S}\\ \ \ \ \text{Z}\ \ \ \ \ \ \ \ \ \ 13\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 14\ \ \ \ \ \ \ \ \ \ \ \ \ \ 15\ \ \ \ \ \ \ \ \ 16\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{Al}_2\text{O}_3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{SiO}_2\ \ \ \ \ \ \ \ \ \text{P}_2\text{O}_3\ \ \ \ \ \text{SO}_2}\\\ \ \ \ \ \ \ \ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\\\ \ \ \ \ \ \ \ \ \ \ \ \text{atmphoteric}\ \ \ \ \ \ \text{acidic}\ \ \ \ \ \ \text{max.}\ \ \ \ \ \text{ acidic}\\\text{Thus,}\ \ \ \ \ \ \text{Al}_2\text{O}_3\ \ \ \ \ \ <\ \ \text{SiO}_2\ <\ \text{P}_2\text{O}_3\ <\ \text{SO}_2$
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MCQ 1521 Mark
Pick out the chemically most reactive elements from the given triads. $\ce{Li, Na, K F, Cl, Br}$
  • A
    $\ce{Li}$ and $\ce{F}$
  • B
    $\ce{Li}$ and $\ce{Br}$
  • ✓
    $\ce{K}$ and $\ce{F}$
  • D
    $\ce{K}$ and $\ce{Br}$
Answer
Correct option: C.
$\ce{K}$ and $\ce{F}$
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MCQ 1531 Mark
An element which is an inert gas with atomic number $2$ is :
  • A
    Hydrogen
  • B
    Argon
  • C
    Chlorine
  • ✓
    Helium
Answer
Correct option: D.
Helium
Element with atomic number $2$ is helium.
Helium is the first element in the inert gas family.
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MCQ 1541 Mark
The law of the modern periodic table was proposed by :
  • ✓
    H.G.I Moselly
  • B
    Dobereincer
  • C
    D.I. Mendeleev
  • D
    Newlands
Answer
Correct option: A.
H.G.I Moselly
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MCQ 1551 Mark
The elements $A$ and $B$ obey Newland's law of octaves. How many elements are there between $A$ and $B\ ?$
  • A
    $7$
  • B
    $8$
  • C
    $5$
  • ✓
    $6$
Answer
Correct option: D.
$6$
According to the law of octaves, elements with similar physical and chemical properties occur after each interval of seven.
Thus, if $A$ is the first element and $B$ is the eighth element, the number of elements in between $A$ and $B$ is $6.$
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MCQ 1561 Mark
An element $'A\ ’$ belongs to the third period and group $16$ of the Periodic Table. Find out the valency of $A$.
  • A
    Valency $= 6$
  • ✓
    Valency $= 2$
  • C
    Valency $= 1$
  • D
    Valency $= 3$
Answer
Correct option: B.
Valency $= 2$
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MCQ 1571 Mark
On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
  • A
    Increases.
  • ✓
    Decreases.
  • C
    Remain the same.
  • D
    First increases then decreases.
Answer
Correct option: B.
Decreases.
The size of the atom decreases on moving from left to right in a period of the periodic table. With an increment in the atomic number, both the proton number and the nuclear positive charge increase. As the nucleus attracts the outermost electron, the size of the atom decreases.
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MCQ 1581 Mark
Which element has smallest atomic size?
  • ✓
    Fluorine
  • B
    Chlorine
  • C
    Bromine
  • D
    Lodine
Answer
Correct option: A.
Fluorine
The atomic size increases down the group because new shells are added when we move along the group.
This increases the distance between the outermost electrons and the nucleus, so the atomic size increases inspite of the increase in nuclear charge.
Therefore, fluorine has the smallest atomic size in the group.
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MCQ 1591 Mark
Name the neutral atom in the Periodic Table which has the same number of electrons as $\ce{K}+$ and $\ce{Cl}-.$
  • A
    Helium
  • ✓
    Argon
  • C
    Neon
  • D
    Krypton
Answer
Correct option: B.
Argon
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MCQ 1601 Mark
Which of the following statements is not a correct statements about the trends when going from left to right across the periods of the periodic table?
  • A
    The elements become less metallic in nature.
  • B
    The number of valence electrons increases.
  • ✓
    The atoms lose their electrons more easily.
  • D
    The oxides become more acidic.
Answer
Correct option: C.
The atoms lose their electrons more easily.
On moving from left to right in the periodic table, the tendency of an atom to lose electrons decreases.
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MCQ 1611 Mark
An element has $12$ protons. The group and period to which this element belongs to is :
  • ✓
    $2^{nd}$ group, $3^{rd}$ period
  • B
    $2^{nd}$ group, $2^{nd}$ period
  • C
    $3^{rd}$ group, $2^{nd}$ period
  • D
    $3^{rd}$ group, $3^{rd}$ period
Answer
Correct option: A.
$2^{nd}$ group, $3^{rd}$ period
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MCQ 1621 Mark
The elements $A, B$ and $C$ belong to group $2, 14$ and $16$ respectively, of the periodic table. Which of the two elements will form covalent bonds?
  • A
    $A$ and $B$
  • ✓
    $B$ and $C$
  • C
    $C$ and $A$
  • D
    None of these
Answer
Correct option: B.
$B$ and $C$
The covalent bond is formed by the sharing of electrons between two atoms.
As the element $B\ ($which belongs to group $14)$ has $4$ valence electrons which it can share with two elements of $C$ type $($from group $16)$ electrons to complete the octet of each included atom:
jagran josh
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MCQ 1631 Mark
The correct formula of the oxide of Eka $-$ aluminium element predicted by Mendeleev was :
  • A
    $\mathrm{EaO}_3$
  • B
    $\mathrm{Ea}_3 \mathrm{O}_2$
  • ✓
    $\mathrm{Ea}_2 \mathrm{O}_3$.
  • D
    $\ce{EaO}.$
Answer
Correct option: C.
$\mathrm{Ea}_2 \mathrm{O}_3$.
The correct formula for the oxide of eka $-$ aluminium, as predicted by Mendeleev, is $\mathrm{Ea}_2 \mathrm{O}_3$.
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MCQ 1641 Mark
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is :
  • A
    Electron.
  • ✓
    Proton.
  • C
    Neutron.
  • D
    Meson.
Answer
Correct option: B.
Proton.
Proton is an atomic particle whose number in the atoms of an element remains the same always, and forms the real basis for the modern classification of elements.
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MCQ 1651 Mark
Total number of groups in Mendeleev's table are :
  • ✓
    $8$
  • B
    $9$
  • C
    $7$
  • D
    $10$
Answer
Correct option: A.
$8$
Mendeleev’s periodic table is based on atomic masses.
The elements in his periodic table are arranged in increasing order of their atomic masses.
Elements with similar properties were placed directly one after another.
There are a total of $8$ groups and $7$ periods in Mendeleev's periodic table.
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MCQ 1661 Mark
Where would you locate the element with electronic configuration $2, 8$ in the Modern Periodic Table?
  • A
    Group $8$
  • B
    Group $2$
  • ✓
    Group $18$
  • D
    Group $10$
Answer
Correct option: C.
Group $18$
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MCQ 1671 Mark
According to Mendeleev's periodic table, one element whose atomic mass is greater than that of nickel is placed before nickel. Name the element.
  • A
    Copper
  • B
    Iron
  • C
    Zinc
  • ✓
    Cobalt
Answer
Correct option: D.
Cobalt
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MCQ 1681 Mark
The elements of group $16$ are called :
  • ✓
    Chalcogens
  • B
    Halogens
  • C
    Pnicogens
  • D
    Noble gases
Answer
Correct option: A.
Chalcogens
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MCQ 1691 Mark
What type of oxide would Eka $-$ aluminium form?
  • A
    $\mathrm{EO}_3$
  • B
    $\mathrm{E}_3 \mathrm{O} 2$
  • ✓
    $\mathrm{E}_2 \mathrm{O}_3$
  • D
    $\ce{EO}$
Answer
Correct option: C.
$\mathrm{E}_2 \mathrm{O}_3$
Eka $-$ aluminium is in the same group as Aluminum, i.e. Group $13$. Hence, there are $3$ electrons in its outermost orbit.
So, it can lost $3$ electrons to form a bond. Oxygen has $6$ electrons in its outermost orbit which means it can gain $2$ electrons to form a bond.
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MCQ 1701 Mark
In Mendeleev's periodic table, gap was not left for one of the following elements. This element is :
  • A
    Gallium.
  • ✓
    Beryllium.
  • C
    Germanium.
  • D
    Scandium.
Answer
Correct option: B.
Beryllium.
In Mendeleev's periodic table, a gap was left for gallium, scandium and germanium.
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MCQ 1711 Mark
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of :
  • A
    Decreasing atomic numbers.
  • B
    Increasing atomic numbers.
  • C
    Decreasing atomic masses.
  • ✓
    Increasing atomic masses.
Answer
Correct option: D.
Increasing atomic masses.
According to Mendeleev's periodic law, the elements in the periodic table were arranged in the order of increasing atomic masses.
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MCQ 1721 Mark
Upto which element, the Law of Octaves was found to be applicable :
  • A
    Oxygen.
  • ✓
    Calcium.
  • C
    Cobalt.
  • D
    Potassium.
Answer
Correct option: B.
Calcium.
Law was found to be applicable upto the element calcium.
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MCQ 1731 Mark
Upto which element, the Law of Octaves was found to be applicable :
  • A
    Oxygen
  • ✓
    Calcium
  • C
    Cobalt
  • D
    Potassium
Answer
Correct option: B.
Calcium
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MCQ 1741 Mark
At the time of Mendeleev, the number of elements known was :
  • ✓
    $63$
  • B
    $65$
  • C
    $62$
  • D
    $64$
Answer
Correct option: A.
$63$
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MCQ 1751 Mark
The modern periodic table has been divided into :
  • ✓
    Seven periods $-$ three short and four long.
  • B
    Nine periods $-$ six short and three long.
  • C
    Eighteen periods $-$ ten short and eight long.
  • D
    Nine periods from zero to $\ce{VII}$
Answer
Correct option: A.
Seven periods $-$ three short and four long.
Seven Periods; three short period and four long period.
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MCQ 1761 Mark
Five elements $\ce{A, B, C, D}$ and $E$ have atomic numbers of $2, 3, 7, 10$ and $18$ respectively. The elements which belong to the same period of the periodic table are :
  • A
    $\ce{A, B, C}.$
  • ✓
    $\ce{B, C, D}.$
  • C
    $\ce{A, D, E}.$
  • D
    $\ce{B, D, E}.$
Answer
Correct option: B.
$\ce{B, C, D}.$
$B, C$ and $D,$ with atomic numbers $3, 7$ and $10$ respectively, belong to the same period of the periodic table. This is because the elements $B, C$ and $D$ have the same valence shell $(L$ shell$).$
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MCQ 1771 Mark
Atomic number of an element is $16.$ What is the nature of the element?
  • A
    Alkali metal
  • B
    Transition metal
  • ✓
    Non metal
  • D
    Halogen
Answer
Correct option: C.
Non metal
Atomic number $16$ have $2, 8, 6 $ configuration and so to complete octet it needs two electron thus has tendency to accept electron.
Due to this electron accepting tendency, it is non $-$ metal.
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MCQ 1781 Mark
The element which has the maximum number of valence electrons is :
  • A
    $\ce{Na}.$
  • ✓
    $\ce{P}.$
  • C
    $\ce{Si}.$
  • D
    $\ce{Al}.$
Answer
Correct option: B.
$\ce{P}.$
Phosphorus $(P)$ has the maximum number of valence electrons, equal to $5.$
Electronic configuration of $P (15):$
$\begin{matrix}\text{K}\ \ \text{L}\ \ \text{M}\\2\ \ \ 8\ \ \ 5\end{matrix}$
Sodium $\ce{(Na)}$ has $1,$ Silicon has $4$ and Aluminium $\ce{(Al)}$ has $3.$
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MCQ 1791 Mark
Which one of the following elements exhibit maximum number of valence electrons?
  • A
    $\ce{Na}.$
  • B
    $\ce{Al}.$
  • C
    $\ce{Si}.$
  • ✓
    $\ce{P.}$
Answer
Correct option: D.
$\ce{P.}$
Electronic configuration of,
$\ce{Na: 2, 8, 1}.$
$\ce{Al: 2, 8, 3}.$
$\ce{Si: 2, 8, 4}.$
$\ce{P: 2, 8, 5}.$
Phosphorus has $5$ valence electrons, while others have less number of valence electrons.
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MCQ 1801 Mark
Which of the following is the atomic number of an element that forms basic oxide?
  • A
    $18$
  • B
    $17$
  • ✓
    $19$
  • D
    $15$
Answer
Correct option: C.
$19$
The elements which can donate their valence electrons to other atoms are the metallic elements which form basic oxides as they give hydroxides in their aqueous solutions.
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MCQ 1811 Mark
Which of the following gives the correct increasing order of the atomic radii of $O, F$ and $N\ ?$
  • A
    $\ce{O, F, N}.$
  • B
    $\ce{N, F, O}.$
  • C
    $\ce{O, N, F}.$
  • ✓
    $\ce{F, O, N}.$
Answer
Correct option: D.
$\ce{F, O, N}.$
It is the correct order. These elements are present in second period.
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MCQ 1821 Mark
An element which is an essential constituent of all organic compounds belongs to:
  • A
    Group $1$
  • ✓
    Group $14$
  • C
    Group $15$
  • D
    Group $16$
Answer
Correct option: B.
Group $14$
Carbon is an essential element for all organic compounds and belongs to group $14.$
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MCQ 1831 Mark
In Newlands classification, elements are arranged in an increasing order of their :
  • A
    Mass number
  • B
    Atomic number
  • ✓
    Atomic weight
  • D
    All of these
Answer
Correct option: C.
Atomic weight
Newlands arranged elements in increasing order of their atomic weight and stated that every eighth element resembled properties of the first element..
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