Modern Periodic Table - Maharashtra Board STD 11 Science Chemistry Questions

Q 1MCQ1 Mark

Which of the following pair of elements has similar properties ?

✓
13, 31
B
11, 20
C
12, 10
D
21, 33

Answer: A.

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Q 2MCQ1 Mark

Which of the following pairs is NOT isoelectronic ?

A
$Na ^{+}$and $Na$
✓
$Mg ^{2+}$ and $Ne$
C
$Al ^{3+}$ and $B ^{3+}$
D
$P ^{3-}$ and $N ^{3-}$

Answer: B.

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Q 3MCQ1 Mark

Which of the atomic number represent the s-block elements ?

A
7, 15
✓
3, 12
C
6, 14
D
9, 17

Answer: B.

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Q 4MCQ1 Mark

In which group of elements of the modern periodic table are halogen placed ?

✓
17
B
6
C
4
D
2

Answer: A.

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Q 5MCQ1 Mark

If the valence shell electronic configuration is $n s^2 n p^5$, the element will belong to

A
alkali metals
✓
halogens
C
alkaline earth metals
D
actinides

Answer: B.

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Q 6Answer the following questions:1 Mark

Write the outer electronic configuration of the following using orbital notation method.
Cu (belongs to period 4 and group 11)

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Q 7Answer the following questions:1 Mark

Write the outer electronic configuration of the following using orbital notation method.
Po (belongs to period 6 and group 16)

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Q 8Answer the following questions:1 Mark

Write the outer electronic configuration of the following using orbital notation method.
Ge (belongs to period 4 and group 14)

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Q 9Answer the following questions:1 Mark

Nonmetallic character increases down a group.

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Q 10Answer the following questions:1 Mark

Nonmetallic character increases from left to right across a period.

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Q 11Answer the following in one or two sentences.2 Marks

Why the elements belonging to the same group do have similar chemical properties ?

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Q 12Answer the following in one or two sentences.2 Marks

Why the second ionization enthalpy is greater than the first ionization enthalpy ?

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Q 13Answer the following in one or two sentences.2 Marks

For each of the following pairs, indicate which of the two species is of large size :
a. $Fe ^{2+}$ or $Fe ^{3+}$
b. $Mg ^{2+}$ or $Ca ^{2+}$

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Q 14Answer the following in one or two sentences.2 Marks

Select the smaller ion form each of the following pairs:
a. $K ^{+}, Li ^{+}$
b. $N ^3, F^{-}$

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Q 15Answer the following in one or two sentences.2 Marks

Name the scientists who made the classification of elements in the nineteenth century.

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Q 16Answer the following in brief.3 Marks

Which principle is followed in the distribution of electrons in an atom?

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Q 17Answer the following in brief.3 Marks

What does the principal quantum number ‘n’ and azimuthal quantum number ‘l’ of an electron belonging to an atom represent?

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Q 18Answer the following in brief.3 Marks

Ionization enthalpy of Li is $520 kJ mol^{-1}$ while that of F is $1681 kJ mol^{-1}$. Explain.

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Q 19Answer the following in brief.3 Marks

he ionic radii of $F^–$ and $Na^+$ are $133$ and $98 \ pm$, respectively.

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Q 20Answer the following in brief.3 Marks

The elements Li, B, Be and N have the electronegativities 1.0, 2.0, 1.5, and 3.0, respectively on the Pauling scale.

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Q 21Answer the following questions.4 Marks

Explain : electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?

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Q 22Answer the following questions.4 Marks

Explain the screening effect with a suitable example.

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Q 23Answer the following questions.4 Marks

La belongs to group $3$ while Hg belongs to group $12$ and both belong to period 6 of the periodic table.
Write down the general outer electronic configuration of the ten elements from La to Hg together using orbital notation method.

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Q 24Answer the following questions.4 Marks

Cu forms coloured salts while Zn forms colourless salts.

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Q 25Answer the following questions.4 Marks

${ }_{13} Al$ is a metal, ${ }_{14} Si$ is a metalloid and ${ }_{15} P$ is a nonmetal.

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Q 26Answer the following questions in detail.6 Marks

Ge, S and Br belong to the groups 14, 16 and 17, respectively. Predict the empirical formulae of the compounds those can be formed by (i) Ge and S, (ii) Ge and Br.

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Q 27Answer the following questions in detail.6 Marks

What is the trend observed in the valency of main group elements?

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Q 28Answer the following questions in detail.6 Marks

Predict the block, periods and groups to which the following elements belong.
$i. Mg (Z = 12) \ \ ii. V (Z = 23) \ \ iii. Sb (Z = 51) \ \ iv. Rn (Z = 86) \ \ v. Na (Z = 11) \ \ vi. Cl (Z = 17)$

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Q 29Answer the following questions in detail.6 Marks

Outer electronic configurations of a few elements are given below. Explain them and identify the period, group and block in the periodic table to which they belong.
$_2He: 1s^2, _{54}Xe: 5s^25p^6, _{16}S: 3s^23p^4, _{79}Au: 6s^15d^{10}$

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Q 30Answer the following questions in detail.6 Marks

How does electronic configuration vary down a group in the modern periodic table?

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Modern Periodic Table question types

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Modern Periodic Table Chemistry - Modern Periodic Table

Modern Periodic Table question types

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