Give the structure of HPO 3 3 .

The structure of the metaphosphoric acid is HPO 3 3 as given below: Metaphosphoric acid contains a ring-like structure in which oxygen and phosphorus atoms are arranged in alternate positions in the ring and each phosphorus atom is attached to another oxygen atom through a double bond and each phosphorus atom carries a –OH group with it.

Give the structure of XeF 4 .

Xenon tetrafluoride has a square planar geometry. Xenon involves sp 3 d 2 hybridisation of xenon which adopts octahedral geometry where two positions are occupied by lone pairs. It is prepared in good yield by heating a mixture of xenon and fluorine in a nickel vessel under desired temperature, pressure and concentration. The structure of xenon tetrafluoride( XeF 4 ) is shown below:

What is Aqua regia? Give its reaction with Gold.

When three parts of concentrated HCl and one part of concentrated HNO 3 are mixed, aqua regia is formed which is used for dissolving noble metals, e.g., gold, platinum. Here, gold dissolves in aqua regia to form tetrachloroaurate ion as shown below: Au + 4 H + + NO 3 - + 4 Cl - → AuCl 4 - + NO + 2 H 2 O .

How is SO 2 an air pollutant?

Sulphur dioxide harms the environment in many ways. They are listed below: When it combines with water vapour present in the atmosphere, it forms sulphuric acid, that damages plants, soil, buildings etc. When the leaves of plants are exposed to sulphur dioxide for a long time, the colour of the leaves of the plant gets faded. This defect is known as chlorosis. The formation of chlorophyll is affected by the presence of SO 2 . It causes irritation in the respiratory tract, throat, eyes, and it can also affect the larynx to cause breathlessness. Therefore, SO 2 is an air pollutant.

Arrange the hydrides of group 16 elements in increasing order of their boiling points.

When we go down the group from boiling point increases with increasing molecular weight but among hydrides of group 16 elements, H 2 O has the highest boiling point which is due to its ability to exhibit intense intermolecular hydrogen bonding. H 2 S < H 2 Se < H 2 Te < H 2 O

OF 2 and O 2 F 2 are called oxygen fluorides and not fluorine oxides. Explain.

OF 2 and O 2 F 2 are called oxygen fluorides and not fluorine oxides because of the higher electronegativity of fluorine than oxygen but the compounds of oxygen and other halogens are known as oxides because the electronegativity of oxygen is more than other halogens.

What are the reasons of inertness of Noble gases towards chemical reactivity?

Noble gases are less reactive. There are the following reasons for their inertness towards chemical reactivity, 1 The noble gases have completely filled ns 2 np 6 electronic configurations in their valence shell except helium 1 s 2 2 They also have high ionization enthalpy and more positive electron gain enthalpy.

Complete the reaction: XeF 2 + PF 5 → ?

The following chemical reaction will take place when xenon difluoride reacts with phosphorus pentafluoride because PF 5 accepts a fluoride ion which yields a cationic species with xenon fluoide as XeF + . XeF 2 + PF 5 → XeF + + PF 6 -

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