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a
Be(OH)2 dissolves in NaOH and forms sodium tetra hydroxidoberyllate.
b
Be(OH)2 dissolves in acid to form beryllium salt.
c
Mg and C are produced when MgO reacts with CaC2
d
Melting point of CaF2 is lower than that of Cal2
answer is D.
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Detailed Solution
(1) 2NaOH+Be(OH)2⟶Na2Be+2OH−442−Sodium tetra hydroxidoberyllate (II)→∆NaBeO2Sodium beryllate (2) Be(OH)2+H2SO4⟶BeSO4+2H2O(3) MgO+CaC2⟶Mg+CaO+2C(4) Melting points of 2nd group halides decrease down the group.According to Fajan's rule, ionic character is:CaF2>CaCl2>CaBr2>CaI2More ionic character, high melting point