1.

The alkalineearthmetalsBa,Sr,Caand Mgmay bearrangedin theorderof theirdecreasingfirstionzationenthalpyas ____.

Answer»

`MG ,CA,SR ,BA`
`Ca ,Sr,Ba,Mg`
`Sr ,Ba,Mg,Ca`
`Ba,Mg,Ca,Sr`

ANSWER :A


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