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A metal M readily forms water soluble MS...

A metal `M` readily forms water soluble `MSO_(4)` water insoluble `M(OH)_(2)` and oxide `MO` which becomes inert on heating. The hydroxide is soluble in `NaOH`. Then `M` is:

A

`Be`

B

`Mg`

C

`Ca`

D

`Sr`

Text Solution

Verified by Experts

The correct Answer is:
A
Given, `M` reacts to give `MSO_(4)`, which is water soluble. `M` reacts to give `M (OH)_(2)`, which is water insoluble. `M` reacts to give `MO`, which becomes inert on heating. `M(OH)_(2)` is soluble in `NaOH`, this indicates that `M` is `Be`, since only `Be`, due to its small size and high ionisation enthalpy, is amphoteric and gives `M(OH)_(2)` which dissolves in `NaOH`.
`Be(OH)_(2)+2NaOHrarrNa_(2)BeO_(2)+2H_(2)O`
other facts given are true for `Be` and not for others.
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  • A metal M readily forms water solube sulphate MSO_(4), water insoluble hydroxide M (OH)_(2) jand oxide MO which becomes inert on heatin. The hydroxide is soluble in NaOH. The M is

    A
    Be
    B
    Mg
    C
    Ca
    D
    Sr

  • A metal M readily forms water soluble sulphate MSO_(4) , water insoluble hydroxide M (OH)_(2) and oxide MO which becomes inert on heating. The hydroxide is soluble in NaOH . The M is

    A
    `Be`
    B
    `Mg`
    C
    `Ca`
    D
    `Sr`

  • A metal M readily forms water soluble sulphate MSO_(4) , water insoluble hydroxide M(OH)_(2) and oxide MO which becomes inert on heating . The hydroxide is soluble in NaOH. The metal M is

    A
    Be
    B
    Mg
    C
    Ca
    D
    Sr

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