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Standard X

Chemistry

Dobereiner's Triads

Can the follo...

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Question 29
Can the following groups of elements be classified as Dobereiner’s triad?

(a) Na, Si, Cl

(b) Be, Mg, Ca

Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40. Explain by giving reason.

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Solution

(a) No, because all these elements do not have similar properties although the atomic mass of silicon is average of the atomic masses of sodium and chlorine.

(b) Yes, because they have similar properties and the mass of magnesium is roughly the average of the atomic mass of Be and Ca.

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Q. Can the following groups of elements be classified as Dobereiner's triads?

(a) Na, Si, Cl
(b) Be, Mg, Ca
Give reason for your answer.
(Atomic masses : Be 9 ; Na 23 ; Mg 24 ; Si 28 ; Cl 35.5 ; Ca 40)

Which will be the third element among the given elements to complete the given Doberiener triad?

(Atomic mass of

Be= 9, Na= 23, Mg= 24, Si= 28, Cl= 35, Ca= 40

)

Na, __ , Cl

Which will be the third element among the given elements to complete the given Doberiener triad?

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

Be, ___, Ca

Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Q. Consider the following orderings:

I

A l > S i > P > C l

I I

B e < M g < C a < S r

I I I

I < B r < C l < F

I V

{N a}^{+} < {M g}^{2 +} < {A l}^{3 +} < {S i}^{4 +}

Which of these give(s) a correct trend in ionization energy?

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Dobereiner's Triads

Standard X Chemistry

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Question 29 Can the following groups of elements be classified as Dobereiner’s triad? (a) Na, Si, Cl (b) Be, Mg, Ca Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40. Explain by giving reason.

(a) No, because all these elements do not have similar properties although the atomic mass of silicon is average of the atomic masses of sodium and chlorine. (b) Yes, because they have similar properties and the mass of magnesium is roughly the average of the atomic mass of Be and Ca.

Question 29
Can the following groups of elements be classified as Dobereiner’s triad?

(a) Na, Si, Cl

(b) Be, Mg, Ca

Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40. Explain by giving reason.

(a) No, because all these elements do not have similar properties although the atomic mass of silicon is average of the atomic masses of sodium and chlorine.

(b) Yes, because they have similar properties and the mass of magnesium is roughly the average of the atomic mass of Be and Ca.