EASY
10th CBSE
IMPORTANT
Earn 100

Why was the system of classification of elements into triads not found suitable?

Important Questions on Periodic Classification Of Elements

MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 2
Calcium, Strontium and Barium form a Dobereiner’s triad. The atomic masses of calcium and barium are 44 and 137 respectively. Predict the atomic mass of strontium.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 3
Chlorine, Bromine and Iodine form a Dobereiners triad. The atomic masses of chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of bromine.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 4
Lithium, sodium and potassium from a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 1
Why is there a necessity for the classification of elements? Give at least two reasons.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 2
What do you understand by triad of elements? Give an example.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 2
State Dobereiner’s law of triads.
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 3
Cl, Li, Ca, Br, Na,Sr, I, K and Ba. From the list of elements given above make three triads and name the family of each triad,
HARD
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 4
Can the following groups of elements be classified as Dobereiner’s triad?

(a) Na, Si, CI
(b) Be, Mg, Ca
Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40

Explain by giving a reason.