1.

Select correct option for True (T) and False (F) (i) In the unit cell of NaCl there are 4Na^(+)Cl^(-) units present. (ii) At very high temperature paramagnetic substance changes to ferromagnetic substance. (iii) CrCO_2 is ferromagnetic and has conductivity as that of metal. (iv) Solid ammonia is molecular solid having low melting point.

Answer»

TFTT
TTTT
FFFT
TFTF

Answer :A


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