The species among the following that does not exist is-
1.
2.
3.
4.
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.
The dissolution of in a solution of results in the formation of -
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
The silicate anion in the mineral kinoite is a chain of three tetrahedra, that share corners with adjacent tetrahedra. The charge of the silicate anion is-
1. -4
2. -8
3. -6
4. -2
Compound (A) is -
1. | A linear silicone | 2. | A chlorosilane |
3. | A linear silane | 4. | A network silane |
This reaction is made to proceed in forward direction by -
1. Addition of Cis- 1,2 diol
2. Addition of borax
3. Addition of trans 1,2- diol
4. Addition of
An Aqueous solution of borax reacts with 2 moles of acid due to -
1. Formation of 2 moles of B(OH)3 only
2. Formation of 2 moles of [B(OH)4]- only
3. Formation of 1 mole each of B(OH)3 and [B(OH)4]-
4. Formation of 2 moles each of [B(OH)4]- and B(OH)3, only [B(OH)4]- reacts with an acid
The reagent that is used to remove and Cl- is -
1. NaOH
2. Pb(NO3)2
3. BaSO4
4. KOH
Aluminium becomes passive in nitric acid because it-
1. Is a noble metal
2. Forms a thin film of oxide
3. Has a positive reduction potential
4. None of the above