Which of the following statements is false?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

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.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

→ In Solid phase BeCl₂ has polymeric chain structure with chlorine bridges
→ Be - undergoes sp³ - hybridisation
In 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 acetylene
Option "2" is incorrect

Oxides of both & Al are amphoteric due to diagonal relationship
Option -3 also correct

IIA group Be,Mg does not give flame test
Reason
due 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 flame
So 4^th option is correct

Watch 3-min video & get full concept clarity