Which of the following compound is weakest Lewis acid ?
(1) BF3
(2) BCl3
(3) BBr3
(4) BI3
The element among the following that does not show inert pair effect is-
1. | Al | 2. | Sn |
3. | Pb | 4. | Thallium |
The correct order of Lewis acid strength of trihalides of boron is:
1. BCl3 > BBr3 > BF3 > BI3
2. BF3 < BBr3 < BCl3 < BI3
3. BF3 < BCl3 < BBr3 < BI3
4. BF3 >BCl3 > BBr3 > BI3
The dissolution of in a solution of results in the formation of -
1.
2.
3.
4.
Choose the correct squence for the geometry of thr given molecules Borazone, Borazole, trimer of FCN. ('P' stands for planar and 'NP' stdans for non-planar)
(1) NP, NP, NP, P, P
(2) P, P, NP, NP, P
(3) NP, NP, NP, P, NP
(4) NP, P, P, NP, P
The incorrect statement among the following regarding borax is-
1. It is a useful primary standard for titrating against acids.
2. One molecule of borax contains 4 \(B — O — B\) bonds.
3. Aqueous solution of borax can be used as a buffer.
4. It is made up of two triangular \(BO_{3}\) units and two tetrahedral \(BO_{4}\) units.
How can this reaction is made to proceed in forward direction?
(a) addition of cis1, 2 diol (b) addition of borax
(c) addition of trans1, 2 diol (d) addition of
The incorrect statement regarding above reactions is :
(a) Al shows amphoteric character
(b) Gas 'P' and 'Q' are different
(d) Both X and Y are water soluble
(d) Gas Q is inflammable
The incorrect statement regarding above reactions is :
(1) Twelve electrons are involed in bonding
(2) Four, two centre-two electron bonds
(3) Two, three centre-two electron bonds
(4) X does not react with
Metal protected by a layer of its own oxide is:
1. Al
2. Ag
3. Au
4. Cu