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 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
Alumina on heating with carbon in nitrogen atmosphere gives:
1.
2.
3.
4.
formation involves large quantity of heat evolution which makes its use in:
1. deoxidizer
2. confectionary
3. indoor photography
4. thermite welding
Al and Ga have the same covalent radii because of:
1. Greater shielding power of s-electrons of Ga atoms
2. Poor shielding power of s-electrons of Ga atoms
3. Poor shielding power of d-electrons of Ga atoms
4. Greater shielding power of d-electrons of Ga atoms
Which of the following imparts green colour to flame?
1.
2.
3.
4.
Reactivity of borazole is greater than that of benzene because:
1. borazole is non-polar compound
2. borazole is polar compound
3. borazole is electron deficient compound
4. of localized electron in it
Diborane does not undergo cleavage reaction with:
1. trimethyl amine
2. ammonia
3.
4.
is used in organic chemistry to convert:
1.
2.
3.
4.
Borazine is obtained by reaction of:
1.
2.
3.
4.
An incorrect statement among the following regarding Al2Cl6 is:
1. | Four Al — Cl bonds are of same length and two of different length |
2. | Six Al — Cl bonds are of same length and two of different length |
3. | The angle Cl — Al — Cl is 110° and 93° |
4. | The angle Al — Cl — Al is 87° |
Heating an aqueous solution of aluminium chloride to dryness will give:
1.
2.
3.
4.
Mica is chemically:
1. potassium alumino silicate having sheet structure
2. calcium alumino silicate having fibrous structure
3. calcium magnesium silicate having three dimensional network
4. hydrated sodium alumino silicate having three dimensional network
The incorrect statement among the following is -
1. is amphoteric
2. is more stable than
3. is weakly acidic
4. GeCl4 + 2HCl ⇄ H2[GeCl6]
has the following characteristics:
1. It is called magnesium allylide
2. It contains and ions
3. It on hydrolysis gives propyne
4. All of the above