Pick the correct statement :
(1) Borax is white crystalline solid containing [B4O5(OH)4]2- units
(2) Aqueous solution of borax is acidic in nature.
(3) Cobalt gives green colour in borax bead test.
(4) All are incorrect.
In B2H6
(1) there is direct boron-boron bond
(2) the structure is similar to that of C2H6
(3) the boron atoms are linked through hydrogen bridges
(4) all the atoms are in one plane
From the B2H6 all the following can be prepared except:
(1) H3BO3
(2) [BH2(NH3)2]+ [BH4]-
(3) B2(CH3)6
(4) NaBH4
Heat of adduct formation
The numerical value of is found to be maximum for :
(1)
(2)
(3)
(4)
Borax is converted into crystalline boron by the following steps:
X and Y are respectively :
1. HCl, Mg
2. HCl, C
3. C, Al
4. HCl, Al
An element that cannot form ion is-
1. | Ga | 2. | Al |
3. | B | 4. | In |
Boric acid is polymeric because of:
1. Its acidic nature
2. Presence of hydrogen bonds
3. Its monobasic nature
4. Its geometry
Boric acid on heating at gives:
1.
2.
3.
4.
The product formed in the reaction,
Product is:
(1)
(2)
(3)
(4) no reaction
On the addition of mineral acid to an aqueous solution of borax, the compound formed is:
1. borodihydride
2. orthoboric acid
3. metaboric acid
4. pyroboric acid