[{"id":140203,"question":"Addition of iron fillings to CuSO<sub>4</sub>solution caused precipitation of Cu owing to the","choices":[{"text":"Reduction of Cu<sup>2+</sup>","value":"A"},{"text":"Oxidation of Cu<sup>2+</sup>","value":"B"},{"text":"Reduction of Fe","value":"C"},{"text":"Reduction of Fe<sup>3+</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140202,"question":"Bell metal is an alloy of","choices":[{"text":"Cu, Zn and Sn","value":"A"},{"text":"Cu, Zn and Ni","value":"B"},{"text":"Cu and Zn","value":"C"},{"text":"Cu and Sn","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140201,"question":"The structure of XeF6","choices":[{"text":"Distorted octahedral","value":"A"},{"text":"Pyramidal","value":"B"},{"text":"Tetrahedral","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140200,"question":"Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because","choices":[{"text":"Helium is much less soluble in blood than nitrogen","value":"A"},{"text":"Helium is much less soluble in blood than helium","value":"B"},{"text":"Under the sea nitrogen and oxygen react to give poisonous nitric oxide","value":"C"},{"text":"Nitrogen is highly soluble in water.","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140199,"question":"The following has zero valency","choices":[{"text":"Na","value":"A"},{"text":"Be","value":"B"},{"text":"Al","value":"C"},{"text":"Kr","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140198,"question":"A clathrate may be defined as a","choices":[{"text":"Cage compound","value":"A"},{"text":"Liquid crystal","value":"B"},{"text":"Mixture","value":"C"},{"text":"Solid solution","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140197,"question":"Which of the following fluorides of xenon is impossible?","choices":[{"text":"XeF<sub>2</sub>","value":"A"},{"text":"XeF<sub>3</sub>","value":"B"},{"text":"XeF<sub>4</sub>","value":"C"},{"text":"XeF<sub>6</sub>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140196,"question":"The spectrum of helium is expected to be similar to that of","choices":[{"text":"H","value":"A"},{"text":"Li<sup>+</sup>","value":"B"},{"text":"Na","value":"C"},{"text":"He<sup>+</sup>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140195,"question":"The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepare by a chemical reaction form a compound of nitrogen due to the presence of the following in aerial nitrogen.","choices":[{"text":"Argon","value":"A"},{"text":"CO<sub>2</sub>","value":"B"},{"text":"Some nitrogen molecules analogous to O2","value":"C"},{"text":"Greater amount of nitrogen molecules derived from N<sup>15</sup>isotope.","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140194,"question":"Which of the following is monoatomic?","choices":[{"text":"Oxygen","value":"A"},{"text":"Neon","value":"B"},{"text":"Fluorine","value":"C"},{"text":"Nitrogen.","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140193,"question":"If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately","choices":[{"text":"800mL","value":"A"},{"text":"200mL","value":"B"},{"text":"10mL","value":"C"},{"text":"Zero","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":140192,"question":"The last orbit of argon would have electrons","choices":[{"text":"8","value":"A"},{"text":"18","value":"B"},{"text":"2","value":"C"},{"text":"6","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140191,"question":"Which for the following has greatest reducing power?","choices":[{"text":"Hl","value":"A"},{"text":"HBr","value":"B"},{"text":"HCl","value":"C"},{"text":"Hl","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140190,"question":"Which of the following belongs to the halogen family?","choices":[{"text":"Francium","value":"A"},{"text":"Polonium","value":"B"},{"text":"Radium","value":"C"},{"text":"Astatine","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140189,"question":"Fluorine does not show positive oxidation states due to the absence of","choices":[{"text":"d-orbitals","value":"A"},{"text":"s-orbitals","value":"B"},{"text":"p-orbitals","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":4}]