M.C.Q

MCQ 11 Mark

An element ' $M$ ' has $50 \%$ of the electrons filled in the $3^{\text {nif }}$ shell as in the 2 nd shell. The atomic number of ' $M$ ' is:

A
10
B
12
✓
14
D
18

Answer

Correct option: C.

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MCQ 21 Mark

An element with atomic number_____ will form a basic oxide.

A
$7(2,5)$
B
$17(2,8,7)$
C
$14(2,8,4)$
✓
$11(2,8,1)$

Answer

Correct option: D.

$11(2,8,1)$

(D) $11(2,8,1)$

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MCQ 31 Mark

The element placed with nickel in the table formed by Newlands was :

A
Iron
✓
Cobalt
C
Chromium
D
Copper

Answer

Correct option: B.

Cobalt

Newlands placed Cobalt $\ce{(Co)}$ and Nickel $\ce{(Ni)}$ in the same group as they have similar properties, but kept Iron $\ce{(Fe)}$ very far from these elements while iron, cobalt and nickel have similar properties.

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MCQ 41 Mark

The law of octaves was proposed by :

✓
Newlands
B
Dobereiner
C
Lavoisier
D
Mendeleev

Answer

Correct option: A.

Newlands

John Newland purposed another way of classification in $1864,$ "According to the law of octave, when elements are placed in increasing order of their atomic mass, every eighth element shows similarity with the preceding eighth element in their physical and chemical properties."

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MCQ 51 Mark

According to Mendele′ ev's Periodic Law, the elements were arranged in the periodic table in the order of :

A
Increasing atomic number.
B
Decreasing atomic number.
✓
Increasing atomic masses.
D
Decreasing atomic masses.

Answer

Correct option: C.

Increasing atomic masses.

The Mendeleev's periodic law is an arrangement of elements in increasing order of their atomic masses as Mendeleev's periodic law states that, the physical and chemical properties of elements are a periodic function of their atomic masses.

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MCQ 61 Mark

As we move along a period, the valency of elements :

A
Increases
B
Decreases
C
Remains same
✓
Increases in the beginning and then decreases.

Answer

Correct option: D.

Increases in the beginning and then decreases.

On moving across a period the number of electrons increases but as the valence electrons crosses $4$ it is easier for elements to accept electrons.
So the valency decreases.

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MCQ 71 Mark

What were the limitations of Newlands' classification?

A
It was applicable only for lighter elements.
B
He adjusted two elements on the same place.
C
The pattern was only observed up to calcium.
✓
All of the above.

Answer

Correct option: D.

All of the above.

The limitations of Newlands' classification were : It was only applicable for lighter elements.
He adjusted two elements in one place. The pattern was only observed up to calcium.

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MCQ 81 Mark

Which of the following elements would lose an electron easily?

A
$\ce{Mg}$
B
$\ce{Na}$
✓
$\ce{K}$
D
$\ce{Ca}$

Answer

Correct option: C.

$\ce{K}$

$\ce{Na}$ and $\ce{K}$ are alkali metals whereas $\ce{Mg}$ and $\ce{Ca}$ are alkaline earth metals. Alkali metals are morel electropositive compare to alkaline earth metals and can easily lose electrons. Out of $\ce{Na}$ and $\ce{K, K }$ will easily lose electrons because of bigger size and less electronic attraction.

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MCQ 91 Mark

Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?

A
$O < F < N$
B
$N < F < O$
C
$O < N < F$
✓
$F < O < N$

Answer

Correct option: D.

$F < O < N$

Oxygen $(8),$ fluorine $(9)$ and nitrogen $(7)$ belong to the same period of the periodic table, in the order nitrogen, oxygen and fluorine.
Now in a period, on moving from left to right the atomic radius of the elements decreases.
Therefore, the atomic radius of nitrogen is the largest.

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MCQ 101 Mark

According to $\ce{IUPAC}$ recommondations, the number of groups in the long form of the periodic table is :

A
$7$
B
$8$
C
$16$
✓
$18$

Answer

Correct option: D.

$18$

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MCQ 111 Mark

The element which forms a basis oxide has the atomic number of :

A
$18.$
B
$17.$
C
$14.$
✓
$19.$

Answer

Correct option: D.

$19.$

Potassium $\ce{(K)}$ forms a basic oxide and has an atomic number of $19$. The atomic numbers of $18, 17$ and $14$ correspond to acidic oxides.

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MCQ 121 Mark

Which of the following set of elements is written in order of their increasing metallic character?

A
$\ce{Na Li K}$
B
$\ce{C Q N}$
C
$\ce{Mg Al Si}$
✓
$\ce{Be Mg Ca}$

Answer

Correct option: D.

$\ce{Be Mg Ca}$

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MCQ 131 Mark

In Mendele′ ev ’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the perioidc table later :

✓
Germanium.
B
Chlorine.
C
Oxygen.
D
Silicon.

Answer

Correct option: A.

Germanium.

Mandeleev named the undiscovered elements as Eka $-$ boron, Eka $-$ aluminium and Eka $-$ silicon.
These were replaced with scandium, gallium and germanium respectively in due course of time.

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MCQ 141 Mark

The metal which is hard and has high melting point and used in filaments of electrical bulbs is :

A
$\ce{Ni}$
B
$\ce{Fe}$
C
$\ce{Pt}$
✓
$\ce{W}$

Answer

Correct option: D.

$\ce{W}$

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MCQ 151 Mark

Eka silicon is now called as :

A
Gallium
B
Scandium
✓
Germanium
D
Indium

Answer

Correct option: C.

Germanium

Eka silicon is now called as germanium. Mendeleev called it “eka $-$ silicon,” meaning “beyond silicon” on his table.

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MCQ 161 Mark

An element belongs to group $17$. It is present in third period and its atomic number is $17.$ What is the atomic number of the element belonging to same group and present in fifth period?

A
$25$
B
$33$
C
$35$
✓
$53$

Answer

Correct option: D.

$53$

The element with atomic number $17$ is chlorine. It belongs to $17^{\text {th}}$ group.
The element belonging to $5^{\text {th}}$ period of the same group is iodine which has an atomic number of $53.$

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MCQ 171 Mark

Upto which element, the Law of Octaves was found applicable?

A
Oxygen
✓
Calcium
C
Cobalt
D
Potassium

Answer

Correct option: B.

Calcium

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MCQ 181 Mark

Which of the following is the valence shell for the elements of second period of the modern periodic table?

A
$M$ shell.
B
$K$ shell.
✓
$L$ shell.
D
$N$ shell.

Answer

Correct option: C.

$L$ shell.

$L$ is the valence shell for elements of the second period of the modern periodic table, since the period number is decided by the number of valence shells.

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MCQ 191 Mark

The group in which all the elements do not have same number electrons in their valence shell is :

✓
Zero
B
Second
C
First
D
Seventh

Answer

Correct option: A.

Zero

In the zeroth group all the elements do not have same number electrons in their valence shell.
Zero group elements are inert elements.
Helium has $2$ electrons and the rest of the group has $8$ elements.

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MCQ 201 Mark

On moving from top to bottom in a group in the periodic table, valency :

A
Increases
B
Decreases
✓
Remains same
D
First increases then decreases

Answer

Correct option: C.

Remains same

On moving from top to bottom in a group in the periodic table, valency remains same.

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MCQ 211 Mark

In the first two groups of periodic table, the group number represents the :

✓
Valency
B
Atomic weight
C
Atomic number
D
Electronegativity

Answer

Correct option: A.

Valency

The Group number in the first two groups of the periodic table represents the valency of a particular element.
i.e. it represents the number of valence electrons in their outermost shell.
For e.g. All Group $- \ce{I}$ elements have $1$ valence electron in their outermost shell and Group $-\ce{ II}$ elements have $2$ electrons in their outermost shell.

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MCQ 221 Mark

An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table.

A
Group $4.$
✓
Group $14.$
C
Group $15.$
D
Group $16.$

Answer

Correct option: B.

Group $14.$

Carbon is the essential constituent of all organic compounds and belongs to Group $14$ of the modern periodic table.
Electronic configuration of carbon $(6):$
$\begin{matrix}\text{K}\ \ \text{L}\\2\ \ 4\end{matrix}$
Group number $=$ valence shell $+ \ 10$
$= 4 + 10 = 14.$

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MCQ 231 Mark

Consider the following figure :

$\ce{P}$	$\ce{Q}$	$\ce{R}$
$\ce{Ru}$	$\ce{Rh}$	$\ce{S}$
$\ce{Os}$	$\ce{Lr}$	$\ce{Pr}$

Here $\ce{, p, q, r}$ and $s$ respectively are:

A
$\ce{Fe, Co, Pd, Ni}.$
B
$\ce{Pd, Co, Ni, Fe}.$
C
$\ce{Fe, Co, Ni, Pd}.$
✓
$\ce{Fe, Ni, Co, Pd}.$

Answer

Correct option: D.

$\ce{Fe, Ni, Co, Pd}.$

$26\ \ce{Fe}$	$27 \ \ce{Co}$	$28 \ \ce{Ni}$
$44 \ \ce{Ru}$	$45 \ \ce{Rh}$	$46 \ \ce{Pd}$
$76\ \ce{ Os}$	$77 \ \ce{Lr}$	$78 \ \ce{Pr}$

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MCQ 241 Mark

Mendeleev’s classification was based on $............$

✓
Increasing atomic mass
B
Decreasing atomic number
C
Increasing atomic number
D
Decreasing atomic mass

Answer

Correct option: A.

Increasing atomic mass

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MCQ 251 Mark

Who was the first to classify the elements into metals and non $-$ metals?

A
Meyer
B
Mendeleev
✓
Lavoisier
D
None of the above

Answer

Correct option: C.

Lavoisier

Antoine Lavoisier first classified the elements into different categories based on their chemical and physical properties.
These categories of elements include metals, nonmetals and metalloids, and noble gases.

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MCQ 261 Mark

Which one of the following elements exhibit the maximum number of valence electrons?

A
$\ce{Na}$
B
$\ce{Al}$
C
$\ce{Si}$
✓
$\ce{P}$

Answer

Correct option: D.

$\ce{P}$

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MCQ 271 Mark

Which of the following elements will form an acidic oxide?

✓
An element with atomic number $7$
B
An element with atomic number $3$
C
An element with atomic number $12$
D
An element with atomic number $19$

Answer

Correct option: A.

An element with atomic number $7$

Non $-$ metals usually forms acidic oxide.
From the option, non $-$ metal is one which has atomic number $7$ which is nitrogen.

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MCQ 281 Mark

Name the following with reference to the elements of the modern periodic table. The alkali metal in period $2 :$

A
$\ce{H}$
✓
$\ce{Li}$
C
$\ce{Rb}$
D
$\ce{Cs}$

Answer

Correct option: B.

$\ce{Li}$

The group $\ce{IA}$ elements $\ce{(Li, Na, K, Rb, Cs}$ and $\ce{Fr)}$ are called alkali metals and the group $\ce{II A}$ elements $\ce{(Be, Mg, Ca, Sr, Ba}$ and $\ce{Ra)}$ are called alkaline earth metals.
According to this, period $2$ alkali metal is $\ce{Li}.$

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MCQ 291 Mark

Which of the following statements are true about the modern form of the periodic table?

A
Properties of the elements are the periodic functions of their atomic number.
B
There are $7$ periods.
C
There are $18$ numbered groups.
✓
All of the above.

Answer

Correct option: D.

All of the above.

The modern periodic table is the tabular arrangement of chemical elements ordered by their atomic number.
The rows of the table are called as periods which are $7$ in number and the columns are called as groups which are $18$ in total.

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MCQ 301 Mark

What happens to the electropositive character of elements on moving from left to right in a periodic table?

A
Increase
✓
Decreases
C
First increases than decreases.
D
First decreases than increases.

Answer

Correct option: B.

Decreases

Electropositive character of an element is its ability to lose electrons and form positive ions.
Now, as on moving from left to right in a period of periodic table, the nuclear charge increases due to the gradual increase in number of protons, so the valence electrons are pulled more strongly by the nucleus.
Thus, it becomes more and more difficult for the atoms to lose electrons causing a decrease in the electropositive character of elements on moving from left to right in a periodic table.

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MCQ 311 Mark

How many periods and groups are present in the periodic table?

✓
$7$ periods and $18$ groups.
B
$8$ periods and $7$ groups.
C
$7$ periods and $7$ groups.
D
$8$ periods and $8$ groups.

Answer

Correct option: A.

$7$ periods and $18$ groups.

Modern periodic table consists of $7$ horizontal rows known as periods and $18$ vertical columns named as groups.

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MCQ 321 Mark

What is the valency of potassium with atomic number $19\ ?$

A
$0$
✓
$1$
C
$2$
D
$3$

Answer

Correct option: B.

$1$

The electronic configuration of potassium is $\{2, 8, 8, 1\}.$
The valence shell contains $1$ electron therefore the valency of potassium is $1.$

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MCQ 331 Mark

Which element resembles cobalt and nickel but was placed in Newlands' table far away from those elements?

A
Sodium
B
Calcium
✓
Iron
D
Chlorine

Answer

Correct option: C.

Iron

Iron resembles cobalt and nickel but in Newlands' table, it was placed far away from these elements in the last group.

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MCQ 341 Mark

The elements $A, B$ and $C$ belong to groups $1, 14$ and $17$ respectively of the Periodic Table. Which two elements will form ionic compounds?

A
$A$ and $B$
✓
$A$ and $C$
C
$B$ and $C$
D
None

Answer

Correct option: B.

$A$ and $C$

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MCQ 351 Mark

The element with atomic number $14$ is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

A
Metal.
✓
Metalloid.
C
Non $-$ metal.
D
Left $-$ hand side element.

Answer

Correct option: B.

Metalloid.

The element with atomic number $\ce{(Z)} = 14$ is silicon $\ce{(Si)}$. It is a metalloid.

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MCQ 361 Mark

What is the other name for group $18^{th}$ elements?

✓
Noble gases
B
Alkali metals
C
Alkali earth metals
D
Halogens

Answer

Correct option: A.

Noble gases

Group $18^{\text {th}}$ elements are named as noble gases as they are very stable due to having the maximum number of valence electrons their outermost shell can hold, hence they rarely react with other elements.

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MCQ 371 Mark

Consider the section of the periodic table:

Group Number	$IA$	$IIA$	$IIIA$	$IVA$
Period	$1$	$2$	$13$	$14$
Second	$Li$	$ $	$C$
Third	$A$	$Mg$	$AI$	$Si$
Fouth	$K$	$B$		$D$

Identify $A, B, C$ and $D$

	$A$	$B$	$C$	$D$
$(i)$	$Cs$	$Be$	$Ca$	$C$
$(ii)$	$Na$	$Ca$	$B$	$Ge$
$(iii)$	$Na$	$B$	$Ca$	$Ge$
$(iv)$	$Cs$	$B$	$Ca$	$C$

A
$(i)$
✓
$(ii)$
C
$(iii)$
D
$(iv)$

Answer

Correct option: B.

$(ii)$

$A =$ Sodium $\ce{(Na), B} =$ Calcium $\ce{(Ca), C} =$ Boron $\ce{(B), D} =$ Germanium $\ce{(Ge)}$

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MCQ 381 Mark

The horizontal rows in Mendleev's table were called :

A
Groups
B
Rows
✓
Periods
D
None of the above

Answer

Correct option: C.

Periods

The horizontal rows in Mendleev's table were called periods.
There are seven periods in Mendeleev's periodic table.

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MCQ 391 Mark

Non $-$ metallic character $............ $ down the group.

A
Increases
✓
Decreases
C
Constant
D
None of these

Answer

Correct option: B.

Decreases

As we move down the group, size increases and also tendency to loose electron increases, non metallic character decreases and metallic character increases.

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MCQ 401 Mark

Listed below are the locations of certain elements in groups and periods of the periodic table. Arrange these elements in the expected order of increasing non-metallic character:

Element in the fourth period and group IV A
Element in the third period and group VI A
Element in the fourth period and group VI A
Element in the six period and group III A
Element in the second period and group VII A

The correct order is:

A
I < II < III < IV < V
B
V < IV < III < II < I
✓
IV < I < III < II < V
D
V < IV < II < I < III

Answer

Correct option: C.

IV < I < III < II < V

IV < I < III < II < V

Explanation:
I refers to the element Ge, II refers to the element S, III refers to the element Se, IV refers to the element Tl, V refers to the element F. Non - metallic character follows the order: Tl < Ge < Se < S < F

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MCQ 411 Mark

In which part of a group would you separately expect the elements to have the greatest metallic character?

✓
Group $1$
B
Group $2$
C
Group $17$
D
Group $18$

Answer

Correct option: A.

Group $1$

In group $1,$ we expect the elements to have greatest metallic character because if they donate $1$ electron in their valence shell they get octet configuration and stability.
Hence, they have huge tendency to donate electrons.
Hence, group $1$ has greatest metallic character.

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MCQ 421 Mark

The elements $, A, B, C, D$ and $E$ have atomic number $9, 11, 17, 12$ and $13$ respectively. Which pair of elements belong to the same group?

A
$A$ and $B$
B
$B$ and $D$
✓
$A$ and $C$
D
$D$ and $E$

Answer

Correct option: C.

$A$ and $C$

Elements having the same number of valence electrons belong to the same group.

Element	Electronic configuration
$A(9)$	$2, 7$
$B(11)$	$2, 8, 1$
$C(17)$	$2, 8, 7$
$D(12)$	$2, 8, 2$
$E(13)$	$2, 8, 3$

As, both $A$ and $C$ elements have the same number of valence electrons which is $7,$ hence they belong to the same group, i.e. $17^{\text {th }}$ group of periodic table.

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MCQ 431 Mark

The formula of chloride of gallium and germanium are:

✓
$\mathrm{GaCl}_3, \mathrm{GeCl}_4$
B
$\mathrm{GaCl}, \mathrm{GeCl}_2$
C
$\mathrm{GaCl}_2, \mathrm{GeCl}_3$
D
$\mathrm{GaCl}_3, \mathrm{GeCl}$

Answer

Correct option: A.

$\mathrm{GaCl}_3, \mathrm{GeCl}_4$

Chloride of gallium is $\mathrm{GaCl}_3 \ ($Gallium chloride$)$
Chloride of germanium is $\mathrm{GeCl}_4 \ ($Germanium tetrachloride$)$

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MCQ 441 Mark

The most distinctive property of the noble gases is that they are :

✓
Unreactive
B
Radioactive
C
Metalloid
D
Metallic

Answer

Correct option: A.

Unreactive

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MCQ 451 Mark

The elements $\ce{A, B, C, D}$ and $E$ have atomic number $9, 11, 17, 12$ and $13$ respectively. Which pair of elements belong to the same group?

A
$A$ and $B.$
B
$B$ and $D$.
✓
$A$ and $C.$
D
$D$ and $E.$

Answer

Correct option: C.

$A$ and $C.$

Elements $A(Z = 9)$ and $C(Z = 17)$ belong to the same group. It is a halogen family $($group $17).$

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MCQ 461 Mark

Element $'X\ ’$ forms a chloride with the formula $\mathrm{XCl}_2$, which is a solid with high melting point. $X $ would most likely be in the same group of the periodic table as:

A
$\ce{Si}$
✓
$\ce{Mg}$
C
$\ce{Al}$
D
$\ce{Na}$

Answer

Correct option: B.

$\ce{Mg}$

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MCQ 471 Mark

The electronic configuration of an element $M$ is $2, 8, 4$. In modern periodic table, the element $M$ is placed in

A
$4^{\text {th }}$ group
B
$2^{\text {nd }}$ group
✓
$14^{\text {th }}$ group
D
$18^{\text {th }}$ group

Answer

Correct option: C.

$14^{\text {th }}$ group

In the periodic table, elements having $4$ valence electrons are placed in group $14.$

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MCQ 481 Mark

Which of the following does not decrease while moving down the group of the periodic table?

A
Atomic radius
B
Metallic character
C
Number of shells in the atom
✓
Valence electrons

Answer

Correct option: D.

Valence electrons

Number of valence electrons in a group remain the same.

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MCQ 491 Mark

The electronic configuration of the atom of an element $X$ is $2, 8, 4.$ In modern periodic table, the element $X$ is places in :

A
$2^{\text {nd }}$ group.
B
$4^{\text {th }}$ group.
✓
$14^{\text {th }}$ group.
D
$8^{\text {th }}$ group.

Answer

Correct option: C.

$14^{\text {th }}$ group.

Group number $= 10 + 4 =14$
Hence, the element $X$ is placed in the $14^\text{th}$ group.

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MCQ 501 Mark

Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?

A
The oxides become more acidic.
B
The elements become less metallic.
C
There is an increase in the number of valence electrons.
✓
The atoms lose their electrons more easily.

Answer

Correct option: D.

The atoms lose their electrons more easily.

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