Which of the following statements is false?

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BeCl2 is a linear molecule in vapour sttate but it is polymer in the solid state

Carbides of both Be and Ca react with water to form acetylene

Oxides of both Be and Al are amphoteric

Flame test is not given by Mg salts

answer is B.

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Detailed Solution

→ In Solid phase BeCl2 has polymeric chain structure with chlorine bridges→ Be - undergoes sp3 - hybridisationIn vapour phase→ It exist as dimeric form→ Be undergoing sp2 hybridisation→ In monomer the "Be" undergoing sp-hybridsation.so option (1) true Be2C + 4H2O → 2Be(OH)2 + CH4 (or) CaC2 + 2H2O → Ca(OH)2 + C2H2 Be2C on hydrolysis gives methane, where as calcium carbide on hydrolysis gives acetyleneOption "2" is incorrectOxides of both & Al are amphoteric due to diagonal relationshipOption -3 also correctIIA group Be,Mg does not give flame testReasondue to their small size the valency electron strongly held by the nucleus, So it can't undergo excitation and can't give colouration to the flameSo 4th option is correct

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