1.

Which is not correctly matched? I) Basic strength of oxides Cs_(2)OltRb_(2)OltK_(2)OltNa_(2)OltLi_(2)O II) Stability of peroxides Na_(2)O_(2)ltK_(2)O_(2)ltRb_(2)O_(2)ltCs_(2)O_(2) III) Stability of biocarbonate LiHCO_(3)ltNaHCO_(3)ltKHCO_(3)ltRbHCO_(3) IV) Melting point NaFltNaClltNaBrltNaI

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1 and 4
1 and 3
1 and 2
2 and 3

Answer :A


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