The diagram below shows part of the skeleton of the Periodic Table in which elements are indicated by letters which are not their usual symbols Which one of the following statements is correct?

Engineering

Chemistry

Development of Periodic Table

Question

The diagram below shows part of the skeleton of the Periodic Table in which elements are indicated by letters which are not their usual symbols

Which one of the following statements is correct?

The greatest ionic character of compounds formed by reaction of pairs of the listed elements would be exhibited by the compound with the formula, M₂Q

The carbonate of compound H is insoluble in water

Element R is a gas at room temperature

The J²⁺ ion is coloured in aqueous solution

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M = Alkali metal (Rb) , Q = Halogen (F)
Therefore, M₂Q will not exist
J is a transition element precisely it will be Ni hence Ni⁺⁺ is coloured due to presence of unpaired electron.
All alkali carbonates are water soluble.
R cannot be gas at room temperature, it will be Sulphur element