[" Amum covaleniey of stable at "569R" ."],[" igen covaleney of sulphur? Give example."],[" gen halide is most volatile? "],[" cincent which s best oxidising agent."]

Some properties of sulphuric acid are listed below . Choose the role played by sulphuric acid as A,B,C or D which is responsible for the reactions I ] to v] . Some role/s may be repeated. A : Dilute acid B : Dehydrating agent C : Non - volatile acid D : Oxidising agent (i) CuSO_(4)*5H_(2)Ooverset(Conc .H_(2)SO_(4))toCuSO_(4)+5H_(2)O (ii) S+2H_(2)SO_(4)[conc.]to3SO_(2)++2H_(2)O (iii) NaNO_(3)+H_(2)SO_(4)[conc.]overset(lt200^(@)C)toNaHSO_(4)+HNO_(3) (iv) Zn+2H_(2)SO_(4)[conc.]toZnSO_(4)+SO_(2)+2H_(2)O

there is a large group of materials P which all the divided into three groups Q ,R and S on the basis of their properties ,THe substance belonging to group Q can be solids liquids or gases ,The solids belonging to group Q arae usually electrical insulators Most of the substance of groups R are solids which are good like R. the properties of s are intermediate between those of Q and R. (a) what could the group of materials Pbe ? (b) Name the substance Q GIve two example of such substance. (c ) Name the substance R write two example of such substance . ( D) Name the substance S . Give two example of such substance . ( e) out of Q ,R and S , which substance are malleable and ductile ?

A, B, C and D illustrate the properties of sulphuric acid whether dilute or concentrated.Choose the role played by sulphuric acid as A, B, C, or D which is responsible for the reaction. Some role(s) may be repeated. Zn + 2H_2SO_4(conc.) to ZnSO_4 + SO_2 + 2H_2O A : Dilute acid B : Dehydrating agent C : Non - volatile acid D : Oxidising agent

Nucleophilic substitution reactions generally expressed as Nu^(-) +R-L rarr R-Nu +L^(-) Where Nu^(-) rarr Nucleophile , R-L rarr substrate, L rarr leaving group The best leaving groups are those that become the most stable ions after they depart. since most leaving group leave as a negatibe ion, the best leaving groups are those ions that stabilize a negative charge most effectively. A good leaving group should be (a) electron-withdrawing to polarize the carbon (b) stable once it has left (not a strong base) (c) polaristable to maintain partial bonding with the carbon in the transition state (both S_(N)1 and S_(N)2) . This bonding helps to stabilise the transition state and reduces the activation energy. Among the following which is feasible?