Water is said to be temporarily hard when it contains
Ca (HCO3)2 and Mg (HCO3)2 salts
Ca (HCO3)2 and CaCO3 SALTS
Mg(HCO3)2 and CaSO4 salts
CaSO4 and Ca(HCO3)2 salts
Correct answer is A
Temporary hardness is caused by the presence of dissolved calcium hydrogentrioxocarbonate(IV) and magnesium hydrogentrioxocarbonate(IV) which decomposes on heating to form calcium trioxocarbonate(IV) and magnesium trioxocarbonate(IV) respectively.
How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
27, 33 and 33
33, 27 and 27
27, 33, and 27
60, 33 and 60
Correct answer is C
No explanation has been provided for this answer.