How many elements are known at present?

Important Questions on Periodic Classification of Elements

EASY

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 4

Define periodic classification.

MEDIUM

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 5

What was the classification made by Lavoisier?

MEDIUM

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 6

What are the postulates of atomic theory? Who gave this theory?

MEDIUM

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 7

Define the law of Dobereiner triads with an example.

HARD

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 8

How would you say $\mathrm{S}$, $\mathrm{S}\mathrm{e}$ and $\mathrm{T}\mathrm{e}$ are triads?

MEDIUM

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 9

Explain the limitation of Dobereiner's triads with an example.

MEDIUM

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 10

Define the Law of octaves.

MEDIUM

10th CBSE

IMPORTANT

Concise Chemistry Part 2>Chapter 5 - Periodic Classification of Elements>PAPER - PEN TEST : 1>Q 11

How many elements were known when Newland gave this law? $\left(56/ 72/ 118\right)$