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Science M.C.Q-[Che-1M]

Periodic Classification of Elements · CBSE STD 10 (CBSE - English Medium). 33 questions.

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M.C.Q-[Che-1M]

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Question 11 Mark
Which one of the following does not increase while moving down the group of the periodic table?
  1. Atomic radius.
  2. Metallic character.
  3. Valence electrons.
  4. Shells in the atoms.
Answer
  1. Valence electrons.

Explanation:

The number of valence electrons does not increase while moving down the group in the periodic table.

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Question 21 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?
  1. The elements become less metallic in nature.
  2. The number of valence electrons increases.
  3. The atoms lose their electrons more easily.
  4. The oxides become more acidic.
Answer
  1. The atoms lose their electrons more easily.

Explanation:

On moving from left to right in the periodic table, the tendency of an atom to lose electrons decreases.

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Question 31 Mark
Which of the following statement is correct in regard to the classification of elements?
  1. Elements in modern periodic table are arranged on the basis of increasing atomic masses.
  2. Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
  3. In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
  4. In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Answer
  1. In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Explanation:

The isotopes of chlorine, having different atomic masses but same atomic numbers are kept in the same group in the modern periodic table.

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Question 41 Mark
Which of the following statement about the modern periodic table is correct?
  1. It has 18 horizontal rows known as periods.
  2. It has 7 vertical columns known as periods.
  3. It has 18 vertical columns known as groups.
  4. It has 7 horizontal rows known as groups.
Answer
  1. It has 18 vertical columns known as groups.

Explanation:

In the modern periodic table, there are 18 vertical columns known as groups.

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Question 51 Mark
Which of the following set of elements is written correctly in the order of their increasing metallic character?
  1. Mg, Al, Si.
  2. C, O, N.
  3. Na, Li, K.
  4. Be, Mg, Ca.
Answer
  1. Be, Mg, Ca.

Explanation:

Be, Mg and Ca are elements of group 2, written in order of their increasing metallic character. On moving down in the group, the metallic character increases.

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Question 61 Mark
Which of the following is the valence shell for the elements of second period of the modern periodic table?
  1. M shell.
  2. K shell.
  3. L shell.
  4. N shell.
Answer
  1. L shell.

Explanation:

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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Question 71 Mark
Which of the following element would lose an electron easily?
  1. Mg.
  2. Na.
  3. K.
  4. Ca.
Answer
  1. K.

Explanation:

K would lose an electron easily as it is a group 1 metal whose atomic number is greater than that of Na, which also belongs to group 1. Mg and Ca are group 2 metals and the tendency to lose electrons decreases on moving from left to right in a period of periodic table.

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Question 81 Mark
Which of the following element does not lose an electron easily?
  1. Na.
  2. F.
  3. Mg.
  4. Al.
Answer
  1. F.

Explanation:

F is the element that does not lose an electron easily, as it is a non - metal (halogen) belonging to group 17 of the periodic table.

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Question 91 Mark
Which of the following are the correct characteristics of isotopes of an element?
  1. Same atomic mass.
  2. Same atomic number.
  3. Same physical properties.
  4. Same chemical properties.
  1. (i), (ii) and (iv).
  2. (ii), (iii) and (iv).
  3. (ii) and (iii).
  4. ​​​​​​​(ii) and (iv).
Answer
  1. ​​​​​​​(ii) and (iv).

Explanation:

Isotopes of an element have the same atomic number and the same chemical properties.

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Question 101 Mark
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
  1. Group 8.
  2. Group 2.
  3. Group 18.
  4. Group 10.
Answer
  1. Group 18.

Explanation:

The element with an electronic configuration of (2, 8) belongs to group 18 (noble or inert gases) of the periodic table, as the elements in this group have their valence shell completely filled with electrons.

Group number = valence shell + 10

= 8 + 10 = 18.

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Question 111 Mark
The three imaginary elements X, Y and Z represent a Dobernener's triad. If the atomic mass of element X is 14 and that of element Y is 46, then the atomic mass of element Z will be:
  1. 28.
  2. 60.
  3. 78.
  4. 72.
Answer
  1. 78.

Explanation:

The atomic mass of the element Z is 78.

According to Dobereiner’s law of triads, atomic mass of $\text{Y}=\frac{\text{X}+\text{Z}}{2}$

Substituting the atomic masses we get:

$46=\frac{14+\text{Z}}{2}$

$92=14+\text{Z}$

$\therefore \text{Z}=78.$

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Question 121 Mark
The three elements having chemical symbols of Si, B and Ge are:
  1. All metals.
  2. All non - metals.
  3. All metalloids.
  4. Si is metalloid, B is metal and Ge is non - metal.
Answer
  1. All metalloids.

Explanation:

The three elements having the chemical symbols Si, B and Ge are metalloids.

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Question 131 Mark
The Newland's law of octaves for the classification of elements was not found to be applicable only up to the element:
  1. Potassium.
  2. Calcium.
  3. Cobalt.
  4. Phosphorus.
Answer
  1. Calcium.

Explanation:

The Newlands' law of octaves for the classification of elements was applicable only up to the element calcium.

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Question 141 Mark
The modern periodic table was prepared by:
  1. Dobereiner.
  2. Newlands.
  3. Bohr.
  4. Mendeleev.
Answer
  1. Bohr.

Explanation:

The modern periodic table of elements was prepared by Neils Bohr.

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Question 151 Mark
The element which has the maximum number of valence electrons is:
  1. Na.
  2. P.
  3. Si.
  4. Al.
Answer
  1. P.

Explanation:

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 (Na) has 1, Silicon has 4 and Aluminium (Al) has 3.

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Question 161 Mark
The element which forms a basis oxide has the atomic number of:
  1. 18.
  2. 17.
  3. 14.
  4. 19.
Answer
  1. 19.

Explanation:

Potassium (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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Question 171 Mark
The element which can from an acidic oxide should be the one whose atomic number is:
  1. 6.
  2. 16.
  3. 12.
  4. 19.
Answer
  1. 16.

Explanation:

The element which can form an acidic oxide should be the one with atomic number 16. Sulphur has an atomic number of 16 and sulphur oxide is acidic.

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Question 181 Mark
The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
  1. A and B.
  2. B and D.
  3. A and C.
  4. D and E.
Answer
  1. A and C.

Explanation:

Electronic configuration of A (9):

$\begin{matrix}\text{K} \ \ \text{L}\\2\ \ \ 7\end{matrix}$

Electronic configuration of C (17):

$\begin{matrix}\text{K}\ \ \text{L}\ \ \text{M}\\2\ \ \ 8\ \ \ 7\end{matrix}$

Group number of A and B = valence electron + 10

= 7 + 10 = 17.

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Question 191 Mark
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
  1. A and D.
  2. C and D.
  3. Aand B.
  4. B and C.
  5. Aand C.
Answer
  1. C and D.
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Question 201 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:
  1. 2nd group.
  2. 4th group.
  3. 14th group.
  4. 8th group.
Answer
  1. 14th group.

Explanation:

Group number = 10 + 4 =14

Hence, the element X is placed in the 14th group.

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Question 211 Mark
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
  1. O, F, N.
  2. N, F, O.
  3. O, N, F.
  4. F, O, N.
Answer
  1. F, O, N.

Explanation:

The increasing order of the atomic radii of oxygen, fluorine and nitrogen is fluorine, oxygen and nitrogen. This is because the atomic radius decreases from left to right in a period.

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Question 221 Mark
The correct formula of the oxide of Eka-aluminium element predicted by Mendeleev was:
  1. EaO3.
  2. Ea3O2.
  3. Ea2O3.
  4. EaO.
Answer
  1. Ea2O3.

Explanation:

The correct formula for the oxide of eka - aluminium, as predicted by Mendeleev, is Ea2O3.

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Question 231 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:
  1. Electron.
  2. Proton.
  3. Neutron.
  4. Meson.
Answer
  1. Proton.

Explanation:

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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Question 241 Mark
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:
  1. Mg.
  2. Na.
  3. K.
  4. Ca.
Answer
  1. K.

Explanation:

Potassium (K) with an atomic number of 19 has the largest atomic radius. This is because sodium and potassium are elements of group 1. On moving from top to bottom in a group, the atomic radius increases. Magnesium and calcium are elements of group 2. The size of the atomic radius decreases on moving from left to right in a period of the periodic table.

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Question 251 Mark
The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is:
  1. P.
  2. Q.
  3. R.
  4. S.
Answer
  1. R.

Explanation:

R (Si) is a metalloid since its atomic number is 14 and it has 4 valence electrons.

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Question 261 Mark
The atomic number of an element is 20. In modern periodic table, this element is placed:
  1. 2nd period.
  2. 4th period.
  3. 3rd period.
  4. 1st period.
Answer
  1. 4th period.

Explanation:

Electronic configuration:

$\begin{matrix}\text{K}\ \ \text{L}\ \ \text{M}\ \ \ \text{N}\\2\ \ \ 8\ \ \ 8 \ \ \ \ 2\end{matrix} $

Hence, from the electronic configuration, it is clear that the outermost electron goes into the 4th shell. So, the element would be placed in the 4th period.

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Question 271 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?
  1. Increases.
  2. Decreases.
  3. Remain the same.
  4. First increases then decreases.
Answer
  1. Decreases.

Explanation:

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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Question 281 Mark
In Mendeleev's periodic table, gap was not left for one of the following elements. This element is:
  1. Gallium.
  2. Beryllium.
  3. Germanium.
  4. Scandium.
Answer
  1. Beryllium.

Explanation:

In Mendeleev's periodic table, a gap was left for gallium, scandium and germanium.

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Question 291 Mark
In Mendeleev's periodic table, gaps were left for the elements to be discovered later on. An element which found a vacant place in the periodic table later on is:
  1. Be.
  2. Si.
  3. Ge.
  4. Se.
Answer
  1. Ge.

Explanation:

Germanium (eka - silicon) is the element which found a vacant place in the periodic table later on.

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Question 301 Mark
Five elements 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:
  1. A, B, C.
  2. B, C, D.
  3. A, D, E.
  4. B, D, E.
Answer
  1. B, C, D.

Explanation:

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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Question 311 Mark
An element X forms an oxide X2O3. In which group of Mendeleev's periodic table is this element placed?
  1. Group II.
  2. Group III.
  3. Group V.
  4. Group VIII.
Answer
  1. Group III.

Explanation:

The element which forms the oxide X2O3 is placed in group 3 of the periodic table.

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Question 321 Mark
An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table.
  1. Group 4.
  2. Group 14.
  3. Group 15.
  4. Group 16.
Answer
  1. Group 14.

Explanation:

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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Question 331 Mark
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:
  1. Decreasing atomic numbers.
  2. Increasing atomic numbers.
  3. Decreasing atomic masses.
  4. Increasing atomic masses.
Answer
  1. Increasing atomic masses.

Explanation:

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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