Dobereneir's Triad

Q.

What do you mean by Dobereiner's triad?

Q. Which of the following does not belong to the group of Doberiener's triad?

1. Calcium, strontium, and barium
2. Chlorine, bromine, and iodine
3. Hydrogen, lithium, and sodium
4. Lithium, sodium, and potassium

Q.

The elements in the Dobereiner’s triads follow:

1. The elements are written in increasing order of atomic mass.

2. Elements in the Triads show similar properties.

3. The mass of middle element was roughly the average of atomic masses of other two elements.

4. All the options are correct

Q. Which of the following belongs to the group of Doberiener's triad?

1. Calcium, strontium, and barium
2. Chlorine, bromine, and iodine
3. Hydrogen, lithium, and sodium
4. Phosphorus, vanadium and niobium

Q.

Which of the following can form Dobereiner’s Triads: with Li(u = 6.9) and Na(u = 23)?

1. K (m = 32)

2. K (m = 37)

3. K (m = 45)

4. K (m = 39)

Q.

X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner's triads. Atomic mass of Z=?

1. 59

2. 125

3. None of the above

4. 130

Q. what were limitations of dobereiners classification

Q.

What were the limitations of Dobereiner's classifications?

Q.

Atomic mass of X and Z are 20 and 40 respectively. If X, Y and Z are in Dobereiner’s triads, what should be the atomic mass of Y?

1. 40

2. 30

3. 60

4. 20

Q. A, B and C are the elements of a Dobereiner's triad. If the atomic mass of A is 10 u and that of C is 28 u, what should be the atomic mass of B?

1. 24 u
2. 19 u
3. 29 u
4. 34 u

Q.

Elements A (35.5u), B (81u) and C follow the Döbereiner's triad. Determine the atomic mass of Element C.

1. 106.5
2. 58.5
3. 126.5
4. 128

Q. Identify the option that is not one of the Dobereiner's triad?

1. Chlorine-35, Bromine-80, Iodine-127
2. Potassium-39, Chlorine-35.5, Bromine-80
3. Calcium-40, Strontium-88, Barium-137
4. Lithium-6, Sodium-22, Potassium-39

Q. Arrange the following elements in the increasing order of atomic masses based on Newland's law of octaves.

1. Be
2. H
3. C
4. Li
5. B

Q.

Which of the following triads is a Dobereiner's Triad?

1. Li, Na, K

2. N, P, As

3. Na, Ra, Al

4. S, O, H

Q.

State the law on which classification of elements was based by arranging elements into groups of three called triads

Q. Three elemts X, Yand Z form a Dobereiner triad. Their atomic weight of X, Y, Z are in the ratio
5:11:7. If the sum of teh atomic weight of extreme elements is 176 find the atomic weights of X, Y and Z.

Q. If elements A, B and C form a Dobereiner's triads, then, atomic mass of element B is arithmetic mean of atomic masses of A and C.

1. False
2. True

Q.

Given below are the elements with their atomic masses. Identify a set of elements which is not a Dobereiner's triad.

1. Li (7), Na (23.0), K (39)

2. N (14.0), P (31.0), As (75)

3. Ca (40), Sr (88), Ba (137)

4. Cl (35.5), Br (80), I (127)

Q. Dobereiner made groups of elements, having similar chemical properties and called them _______.

1. triads
2. trio
3. tetrads
4. dyads

Q. Analyse the elements given below and identify ‘X’ if the given elements are forming Dobereiner's triad.

Li (6.9), Na (X), K (39.0)

1. 15.3
2. 23.0
3. 19.0
4. 45.9

Q. Identify the option that is not one of the Dobereiner's triad?

1. Lithium-6, Sodium-22, Potassium-39
2. Chlorine-35, Bromine-80, Iodine-127
3. Potassium-39, Chlorine-35.5, Bromine-80
4. Calcium-40, Strontium-88, Barium-137

Q. Identify the set of elements that will form Dobereiner triad.

1. Lithium, sodium, potassium
2. Helium, neon, argon
3. Helium, hydrogen, potassium
4. Nitrogen, phosphorus, arsenic

Q. Atomic mass of X and Z are 20 u and 40 u respectively. If X, Y and Z constitute Dobereiner’s triads, what should be the atomic mass of Y (in $u$)?

1. 20
2. 40
3. 30
4. 60

Q. Which of the following belongs to the group of Doberiener's triad?

1. Calcium, strontium, and barium
2. Chlorine, bromine, and iodine
3. Hydrogen, lithium, and sodium
4. Phosphorus, vanadium and niobium

Q. Lithium, sodium and potassium together form a Dobereiner's triad.

1. False
2. True