[{"id":140158,"question":"The principal constituent of pyrex glass","choices":[{"text":"Zn","value":"A"},{"text":"B","value":"B"},{"text":"Pb","value":"C"},{"text":"Cl","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140157,"question":"The halide which is not hydrolysed is","choices":[{"text":"SiCl<sub>4</sub>","value":"A"},{"text":"SiF<sub>4</sub>","value":"B"},{"text":"CCl<sub>4</sub>","value":"C"},{"text":"PbCl<sub>4</sub>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":140156,"question":"When excess of SnCl<sub>2</sub>is added to a solution of HgCl<sub>2, a white precipitate turning to grey is obtained. They grey colour is due to the formation of</sub>","choices":[{"text":"Hg<sub>2</sub>Cl<sub>2</sub>","value":"A"},{"text":"SnCl<sub>4</sub>","value":"B"},{"text":"Sn","value":"C"},{"text":"Hg","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140155,"question":"Galena is an ore of","choices":[{"text":"Gallium","value":"A"},{"text":"Lead","value":"B"},{"text":"Tin","value":"C"},{"text":"Germanium","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140154,"question":"The substance used as a smoke screen in warfare is","choices":[{"text":"SiCl<sub>4</sub>","value":"A"},{"text":"PH<sub>3</sub>","value":"B"},{"text":"PCl<sub>5</sub>","value":"C"},{"text":"Acetylene","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140153,"question":"Al is more reactive than Fe but Al is less easily corroded than Fe because","choices":[{"text":"It is a noble metal","value":"A"},{"text":"oxygen forms a protective reaction easily with water","value":"B"},{"text":"Iron undergoes reaction easily with water","value":"C"},{"text":"Fe form mono and divalent ions.","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140152,"question":"Alum is not used","choices":[{"text":"As a mordant in dyeing","value":"A"},{"text":"As an insecticide","value":"B"},{"text":"In purification of water","value":"C"},{"text":"In tanning of leather","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":140151,"question":"Which is true for an element R present in group 13 of the periodic table?","choices":[{"text":"It is a gas at room temperature","value":"A"},{"text":"It has oxidation state of +4","value":"B"},{"text":"It forms R<sub>2</sub>O<sub>3</sub>","value":"C"},{"text":"It forms RX<sub>2</sub>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":140150,"question":"In which of the following elements +1 oxidation state is more stable than +3","choices":[{"text":"B","value":"A"},{"text":"Al","value":"B"},{"text":"ga","value":"C"},{"text":"Ti","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140149,"question":"Inert pair effect plays an important role in case of","choices":[{"text":"F","value":"A"},{"text":"Al","value":"B"},{"text":"Si","value":"C"},{"text":"Tl","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140148,"question":"Which metal is protected by a layer of its own oxide?","choices":[{"text":"Al","value":"A"},{"text":"Ag","value":"B"},{"text":"Au","value":"C"},{"text":"Fe","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140147,"question":"Which is the most amphoteric?","choices":[{"text":"Na<sub>2</sub>O","value":"A"},{"text":"MgO","value":"B"},{"text":"Al<sub>2</sub>O<sub>3</sub>","value":"C"},{"text":"CaO","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":140146,"question":"Aluminothermy used for on the spot welding of large iron structure is based upon the fact that","choices":[{"text":"As compared to iron, aluminium has greater affinity for oxygen","value":"A"},{"text":"As compared to aluminium, iron has greater affinity for oxygen","value":"B"},{"text":"Refraction between aluminium and oxygen is endothermic","value":"C"},{"text":"Reaction between iron and oxygen is endothermic.","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":140145,"question":"Which of the following mineral does not contain Al?","choices":[{"text":"Cryolite","value":"A"},{"text":"Mica","value":"B"},{"text":"Feldspar","value":"C"},{"text":"Fluorspar","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":140144,"question":"Which one of the following has the lowest boiling point?","choices":[{"text":"B","value":"A"},{"text":"Al","value":"B"},{"text":"Ga","value":"C"},{"text":"Ti","value":"D"},{"value":"E"}],"correctAnswer":3}]