Water is said to be temporarily hard when it contains?
A. Ca (HCO3)2 and Mg (HCO3)2 salts B. Ca (HCO3)2 and CaCO3 salts C. Mg(HCO3)2 and CaSO4 salts D. CaSO4 and Ca(HCO3)2 salts Correct Answer: Option A – Ca(HCO3)2 and Mg(HCO3)2 salts
The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with?
A. water vapour B. oxgyen C. rare gases D. carbon (IV) oxide Correct Answer: Option C – rare gases
The radio active radiation used in studying the arrangement of particles in giant organic molecules is?
A. γ – rays B. α – particles C. X-rays D. β – particles Correct Answer: Option C – X-rays
How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
A. 27, 33 and 33 B. 33, 27 and 27 C. 27, 33, and 27 D. 60, 33 and 60 Correct Answer: Option C – 27, 33, and 27Products
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