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Assertion : ClF3 exists bul FCl3 does not.
Reason : FCl3 is not formesd due to greater steric hinderance by the larger Cl atoms.
ClF3 exists bul FCl3 does not because FCl3 is not formed due to greater steric hinderance by the larger Cl atoms.
Assertion : Among hydrides of the elements of group 16, water shows unusual physical properties.
Reason: Water shows unusual pysical properties due to hydrogen bonding between the water molecules.
Water shows unusual physical properties due to hydrogen bonding between the water molecules.
Which of the following is not correct?
The molecular shape of are:
Argon is used:
Argon is also used to form inert atmospheres for arc welding,
growing semiconductor crystals and processes that require shielding from other atmospheric gases.
Among the following reactions, in which of the following, a blue complex will be formed when starch solution is added?
(A) When chlorine is passed through NaI
(B) Sodium iodate is treated with sodium bisulphite solution
(C) KI is treated with and conc.
(D) KI is added to bleaching powder containing dilute acetic acid
All above are correct
Which one is most basic in character?
Acidic strength is in the order
HI > HBr > HCl > HF
So the conjucate bases are
I- < Br- < Cl- < F-
Thus fluoride ion is the strongest base and iodide ion ​is the weakest base
HBr and HI reduce sulphuric acid; HCl can reduce and HF reduces:
Fluorine is most electronegative element and its size is very small, so it does not have a tendency to lose electrons. Hence, never behave as a reducing agent. HF is a good oxidising agent.
The hydrogen fluoride is liquid unlike the other hydrogen halides, because:
Hydrogen fluoride (HF) is a liquid at room temperature due to the strong intermolecular hydrogen bonding present between HF molecules. The small size of the fluorine atom allows the hydrogen bond to form easily, resulting in a higher boiling point compared to other hydrogen halides.
The correct order of the thermal stability of hydrogen halide (H-X) is:
(2)
As the size of the halogen atom increases from F to I, H – X bond length in HX molecules also increases from H – F to H – I (H – F < H – Cl < H – Br < H – I).
The increase in H – X bond length decreases the strength of H – X bond from H – F to H – I (H – F > H – Cl > H – Br > H – I). The decrease in the strength of H – X bond is evident from the fact that H – X bond dissociation energies decrease from H – F to H – I.
Due to successive decrease in the strength of H – X bond from H – F to H – I, thermal stability of HX molecules also decreases from HF to HI (HF > HCl > HBr > HI).
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