`SF_6` is known but `SH_6` is not known because:
A) Fluorine is the strongest oxidizing agent
B) Hydrogen is a weak oxidizing agent
C) Both A and B
D) Sulphur has smaller size

(a) Fluorine is a stronger oxidizing agent than chlorine. Why ? (b) Write one use of chlorine gas (c) Complete the following equation CaF_(2)+H_(2)SO_(4)rarr

(a) Account for the following observations : (i) SF_(4) is easily hydrolysed whereas SF_(6) is not easily hydrolysed. (ii) Chlorine water is a powerful bleaching agent. (iii) Bi (V) is a stronger oxidising agent than Sb(V) (b) What happens when : (i) White phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO_(2). (ii) XeF_(6) undergoes partial hydrolysis. (Give the chemical equations involved).

Assertion: SiF_(6)^(2-) is known but SiCl_(6)^(2-) is not. Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of Si strongly.

(a) Halogens have maximum negative gain enthalpy in the respective periods of the periodic table. Why? (b) Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine . Why? Fluorine exhibits only-1 oxidation state, wherease other hlaogens exhibit +1,+3,+5, and +7 oxidation states also. explain.

(a) Halogens have maximum negative gain enthalpy in the respective periods of the periodic table. Why? (b) Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine . Why? Fluorine exhibits only-1 oxidation state, whereas other halogens exhibit +1,+3,+5, and +7 oxidation states also. Explain.

A non-metal A which is the largest constituent of air, when heated with H2 in 1 : 3 ratio in the presence of catalyst (Fe) gives a gas B. 0n heating with O_(2) it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent. (a) Identify A, B, C and D. (b) To which group of the periodic table does this non-metal belongs?

(a) Account for the following : (i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4. (ii) Cr^(2+) is a strong reducing agent. (iii) Cu^(2+) salts are coloured while Zn^(2+) salts are white. (b) Complete the following equations : (i) 2MnO_(2) + 4KOH + O_(2) overset(Delta)(to) (ii) Cr_(2)O_(7)^(2-) + 14H^(+)6I^(-) to

During developing of an exposed camera film, one step involves in the following reaction : Which of the following best describes the role of quinol? (a)It acts as an acid (b)It acts as reducing agent (c)It act as oxidant (d)It acts as a base

Account for the following: (a) Sulphurous acid is a reducing agent (b)Fluorine forms only one oxoacid (c) Boiling point of noble gases increases from He to Rn.

Explain the following (a) CO_(2) is a better reducing agent below 710 K whereas CO is a better reducing agent above 710 K . (b) Generally sulphide ores are converted into oxides before reduction. ( c) Silica is added to the sulphide ore of copper in the reverberatory furnance. (d) Carbon and hydrogen are not used as reducing agents at high temperature. (e) Vapour phase refining method is used for the purification of Ti