Borax is an important compound of Boron. Diamond has co-valent bonding. Yet it has high melting point. Give a reason.

Borax is an important compound of Boron.Give any two uses of borax.

Borax is an important compound of Boron. The solution of borax is alkaline. Give a reason.

Whichof the following has high boiling point?

Out of the following solutions which has the lowest freezing point ? Give reasons

Give reason for (i) diamond is a covalent compound yet its melting point is very high (ii) Diamond is used as a precious stoke.

Diborane is an important hydride of Boron. During a classroom discussion, a student argues that there is a covalent bond between Boron atoms in diborane. What is your opinion? Give justification.

Diborane is an important hydride of Boron a. During a class room discussion, a student argues that there is a covalent bond between boron atoms in diborane. What is your opinion. Give justification. b. Boron halides can act as Lewis acids. Give reason. c. Arrange the following Lewis acids in the increasing order of acidic strength. Substantiate your answer? 'BF_3 BCl_3, BBr_3'

Assertion : Aluminothermy is used for extraction of chromium from chromium oxide. Reason : Alumina has a high melting point.

Describe giving reason which one.of the following pairs has the property indicated i. Fe or Cu has higher melting point ii. '(Co)^2+or '(Ni)^2+ has lower magnetic moment.

What effect does branching of an alkane chain has on its melting point?