Boric acid is polymeric due to-
1. Its acidic nature.
2. The presence of hydrogen bonds.
3. Its monobasic nature.
4. Its geometry.
The incorrect statement among the given options is :
1. | CO2 can be prepared by the action of dilute hydrochloric acid on calcium carbonate. |
2. | CO is prepared by the dehydration of formic acid with conc. H2SO4. |
3. | CO2 is commercially prepared by passing steam over hot coke. |
4. | CO is commercially prepared by passing steam over hot coke. |
The correct reaction(s) among the following options is/are -
1.
2.
3.
4. All of the above
The incorrect statement among the given options is-
1. | Inert pair effect is because of the poor shielding of the ns2 electrons by the d- and f- electrons. |
2. | Allotropy is the existence of an element in more than one form. |
3. | Catenation is the bonding of atoms of the same element into a series, called a chain. |
4. | None of the above. |
The correct statement(s) regarding diborane and boric acid is/are-
1. Diborane has two 3c-2e- bonds.
2. Boric acid has a layered structure.
3. Four 2c-2e- bonds are present in diborane.
4. All of the above
The incorrect statement among the following options is-
1. | Conc. HNO3 can be transported in an aluminium container. |
2. | Diamond is used as an abrasive. |
3. | A mixture of dilute NaOH and aluminium pieces is used to declog the drain. |
4. | Graphite can't be used as a lubricant. |
The correct statement(s) among the following options is/are:
1. | Aluminium alloys are used to make aircraft bodies. |
2. | Aluminium utensils should not be kept in water overnight. |
3. | Aluminium wire is used to make transmission cables. |
4. | All of the above |
The incorrect statement regarding diamond and graphite is-
1. | In diamond each carbon is sp2 hybridised and in graphite, each carbon is sp3 hybridised. |
2. | Diamond is an insulator |
3. | Graphite has a planar geometry. |
4. | Both (2) and (3) |
Consider the following reaction,
X and Y in the above reaction are:
Amphoteric oxides are:
1. Tl2O3, SiO2
2. ,
3. ,
4. Al2O3 , PbO2