CSS 2014 General Science & Ability — MCQs

Ecology 1 Environmental Science 1 Astronomy 5 History 3 Meteorology 1 1 All alkali metals react with water to form:

• AOxides
• BPeroxides
• CHydroxides
• DHyper oxides 2 Permanent hardness of water is due to the presence of: 2 x Also in: CSS · 2019 · General Science & Ability A Calcium bicarbonate B Magnesium bicarbonate C Calcium sulphate D Sodium bicarbonate 3 Bleaching powder loses its power on keeping for a long time because: A It changes into calcium hypochlorite B It changes into calcium chloride and calcium hydroxide C It absorbs moisture D It changes into calcium chloride and calcium chlorate