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# Periodic Classification of Elements

10th Class - CBSE - Chemistry - 1615 Questions - 0 Concepts

#### Important Questions

Q1 Single Correct Hard

Which of the following series correctly represents relations between the elements from X to Y?
$X \rightarrow Y$

• A. $_6 C \rightarrow _{32} Ge$ Atomic radii increases
• B. $_3Li \rightarrow _{19}K$ Ionization enthalpy increases
• C. $_9F \rightarrow _{35}Br$ Electron gain enthalpy with negative sign increases
• D. $_{18}Ar \rightarrow _{54}Xe$ Noble character increases

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q2 Assertion & Reason Hard
##### ASSERTION

According to Mendeleev, the properties of elements are a periodic function of their atomic weights.

##### REASON

Mendeleev left the gap under aluminium and a gap under silicon, and called these elements Eka-Aluminium and Eka-Silicon.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q3 Multiple Correct Hard
Which of the following statement(s) is/are true about the modern form of periodic table?
• A. Properties of the elements are the periodic functions of their atomic number
• B. There are 7 periods
• C. There are 8 groups
• D. It has separate positions for the isotopes

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q4 Single Correct Hard
Nuclear attraction is often the deciding control factor for the association of neutral molecules to a given metal ion. Which one of the following represents the correct order of stability of the ions?
$[Be(H_2O)_4]^{2+}, [Mg(H_2O)_4]^{2+}, [Ca(H_2O)_4]^{2+}$ and $[Sr(H_2O)_4]^{2+}$
• A. $[Be(H_2O)_4]^{2+} > [Sr(H_2O)_4]^{2+} > [Mg(H_2O)_4]^{2+} > [Ca(H_2O)_4]^{2+}$
• B. $[Ca(H_2O)_4]^{2+} > [Mg(H_2O)_4]^{2+} > [Be(H_2O)_4]^{2+} > [Sr(H_2O)_4]^{2+}$
• C. $[Sr(H_2O)_4]^{2+} > [Ca(H_2O)_4]^{2+} > [Mg(H_2O)_4]^{2+} > [Be(H_2O)_4]^{2+}$
• D. $[Be(H_2O)_4]^{2+} >[Mg(H_2O)_4]^{2+} > [Ca(H_2O)_4]^{2+} > [Sr(H_2O)_4]^{2+}$

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q5 Assertion & Reason Hard
##### ASSERTION

Metallic character is highest at the extremely left side of the periodic table.

##### REASON

Ionization enthalpy increases across a period.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q6 Assertion & Reason Hard
##### ASSERTION

Boron can only form $[BF_4]^{-}$, whereas aluminum forms $[AlF_{6}]^{3-}$

##### REASON

The first member of a group of elements in the $s-$ and $p-$blocks shows anomalous behavior

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q7 Subjective Hard
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q8 Single Correct Hard
The number of unpaired electrons in Ni (atomic number $=28$) are _____.
• A. $0$
• B. $2$
• C. $4$
• D. $8$

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q9 Single Correct Hard
• A. ${\text{N}}{{\text{a}}^{\text{ + }}}$
• B. $F$
• C. $O$
• D. $Na$

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Q10 Single Correct Hard
Consider the following statements.
(I) Rutherford's name was associated with the development of periodic table.
(II) A metal M having electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{1}$ is d-block element.
(III) Diamond is an element.
(IV) The electronic configuration of the most electronegative element is $1s^{2}2s^{2}2p^{5}$.
The correct statements are :
• A. I, II, IV
• B. I, II, III, IV
• C. II, IV
• D. I, III, IV

Asked in: Chemistry - Periodic Classification of Elements

1 Verified Answer | Published on 04th 08, 2020

Questions 122475
Subjects 10
Chapters 93
Enrolled Students 65