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P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?
- a)15.0
- b)40.0
- c)30.0
- d)39.0
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
P, Q, R are elements of Dobereiner’s triads. If the atomic mass ...
In a Dobereiner's traid, the atomic mass of the middle element is roughly the average of the atomic mass of the other 2 elements. Thus,
Atomic mass of Q = (at. mass of P+ at. mass of R) /2
⇒ 23 = 7+ m(R) /2
⇒ 23*2 = 7+ m(R)
⇒ 46 -7 = m(R)
⇒ atomic mass of R = 39
Atomic mass of Q = (at. mass of P+ at. mass of R) /2
⇒ 23 = 7+ m(R) /2
⇒ 23*2 = 7+ m(R)
⇒ 46 -7 = m(R)
⇒ atomic mass of R = 39
Most Upvoted Answer
P, Q, R are elements of Dobereiner’s triads. If the atomic mass ...
In a Dobereiner's traid, the atomic mass of the middle element is roughly the average of the atomic mass of the other 2 elements. Thus,
Atomic mass of Q = (at. mass of P+ at. mass of R) /2
⇒ 23 = 7+ m(R) /2
⇒ 23*2 = 7+ m(R)
⇒ 46 -7 = m(R)
⇒ atomic mass of R = 39
Atomic mass of Q = (at. mass of P+ at. mass of R) /2
⇒ 23 = 7+ m(R) /2
⇒ 23*2 = 7+ m(R)
⇒ 46 -7 = m(R)
⇒ atomic mass of R = 39
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass ...
Hey supraja....see we know that according to the Dobereiner's triads that if we arrange the elements according to there incrising atomic masses...then the sum of mean of first and third element mass will be same as the mass of the middle element of triads........SO..... P is the 1st element and q is the second and R is the third one.
So...(P+R)/2 = Q....(7+R)/2 = 23......7+R = 23×2.........R = 46 - 7 ........R = 39.
So the mass of the element R will be 30u..
I think those guys u havent readen traids will get confuse...let me first clear that... dobereiners was the first scientist who show the relation between different elements for study their property easily.......he show if we put theree element in triads.....in increasing atomic masses....then the property of all those three element will be same.......and the sum of mean of masses of 1st and 3rd element will be same as the mass of 2nd element....in simple avrage of masses of 1st and 3rd element will be equal to the mass of 2nd element.
Now i hope u all can understand it more easily...if u like then plz upvote...
So...(P+R)/2 = Q....(7+R)/2 = 23......7+R = 23×2.........R = 46 - 7 ........R = 39.
So the mass of the element R will be 30u..
I think those guys u havent readen traids will get confuse...let me first clear that... dobereiners was the first scientist who show the relation between different elements for study their property easily.......he show if we put theree element in triads.....in increasing atomic masses....then the property of all those three element will be same.......and the sum of mean of masses of 1st and 3rd element will be same as the mass of 2nd element....in simple avrage of masses of 1st and 3rd element will be equal to the mass of 2nd element.
Now i hope u all can understand it more easily...if u like then plz upvote...
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer?
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer?.
P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer?.
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer?, a detailed solution for P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)15.0b)40.0c)30.0d)39.0Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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