Among ${\mathrm{Na}}_2\mathrm{O}$, $\mathrm{MgO}$, ${\mathrm{Al}}_2{\mathrm{O}}_3$ and ${\mathrm{SiO}}_2$, the most basic oxide is

Important Questions on Periodic Classification of Elements

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 13

 Which pair of elements having atomic number given below has similar properties? 

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10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 14

In which group of the long form of the periodic table, noble gases have been placed?

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10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 15

How many elements are present in the fifth period of the Periodic Table? 

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10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 16

According to $\mathrm{IUPAC}$ recommendations, the number of groups in the long form of the periodic table is

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 17

The law on which modern periodic table is based on was proposed by 

EASY

10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 18

 The least metallic element of group $1$ is

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10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 19

Which of the following properties generally increases on moving from top to bottom? 

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10th CBSE

IMPORTANT

Eduwiser's CBSE Chemistry For Class X>Chapter 5 - Periodic Classification of Elements>Exercise 9>Q 20

Which of the following statement is not correct about the trends when going from left to right across the periodic table?