Match List - I with List - II

	List - I		List - II
(a)	$$Ca{(OCl)_2}$$	(i)	Antacid
(b)	$$CaS{O_4}.{1 \over 2}{H_2}O$$	(ii)	Cement
(c)	$$CaO$$	(iii)	Bleach
(d)	$$CaC{O_3}$$	(iv)	Plaster of paris

Choose the most appropriate answer from the options given below :

Compound with molecular formula C₃H₆O can show :

The correct structures of trans-[NiBr₂(PPh₃)₂] and meridonial-[Co(NH₃)₃(NO₂)₃], respectively, are

A certain orbital has no angular nodes and two radial nodes. The orbital is :