ICSE − Q & A

I have some doubts:
1)State the group number of the group number of  the group which has 3 columns of elements.
2)Name an acid solid in nature.
3)Is Iron(II) Sulphate soluble in water?
4)What is the molecular formula of sodium zeolite?Is it soluble in water?
5)Is the colour of Iron (III) Chloride reddish-brown or yellow?
6)Viraf J Dalal workbook Pg 42 3.(6) Solid sodium chloride contains ions ryt(they havent mentioned free anywhere)
7)Name a nonmetal which volatizes at low temperatures and burns with a pale blue flame.(Is this hydrogen?)
8)Starting from aluminium how would u prepare a dil. acid which gives a white ppt with barium sulphate the precipitate being insoluble in all dil. acids?(Isnt BaSO4 already a ppt?)
9)Which gas turns alkaline pyrogallol soln brown?Cud u give a rxn if possible?
10)Zinc is used in voltaic cells as  cathode.In voltaic cells cathode means +ve  terminal right?
11)Which alloy of copper is used in hardware and scientific instruments?
12)Which alloy of aluminium is used to make the beams of a balance?
13)Why is amalgamated sodium preferred to  normal sodium for preparation of hydrogen?
14)Why is zinc added to copper in the right proportion for manufacture of screws?
15)Electric wires of nichrome are preferred to copper wires for specific applications.Give Reason.
Cud someone pls answer these questions?

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