Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Periodic Table
Whitewashed walls appear to be shiny after three to four days due to the formation of:
1
calcium nitrate
2
calcium sulphate
3
calcium carbonate
4
More than one of the above
5
None of the above