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10th CBSE
IMPORTANT
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If atomic mass of calcium is 40 and that of barium is 137, then the atomic mass of strontium, which constitutes the triad of Ca, Sr and Ba is:

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Important Questions on Periodic Classification Of Elements

EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 3
Law of octaves for the classification of elements was stated by:
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10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 4
Two elements A and B obey Newlands law of classification of elements. The elements between A and B are:
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10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 5
The reasons for rejecting the law of octaves is:
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10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE 5A>Q 1
Why was the system of classification of elements into triads not found suitable?
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.