[{"id":252930,"question":"The oxidation state of carbon in C2O-²4 is","choices":[{"text":"+4","value":"A"},{"text":"-4","value":"B"},{"text":"+3","value":"C"},{"text":"+2","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252929,"question":"<sup>The common oxidation number of halogens is</sup>","choices":[{"text":"-1","value":"A"},{"text":"+1","value":"B"},{"text":"-2","value":"C"},{"text":"0","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252928,"question":"In SO-²4 the oxidation number of sulphur is","choices":[{"text":"-8","value":"A"},{"text":"-6","value":"B"},{"text":"+8","value":"C"},{"text":"+6","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252927,"question":"In MgCl2, the oxidation state ofCI is","choices":[{"text":"Zero","value":"A"},{"text":"-2","value":"B"},{"text":"+2","value":"C"},{"text":"-1","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252926,"question":"<div>In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their</div><div><br></div>","choices":[{"text":"Oxidation states","value":"A"},{"text":"Reduction states","value":"B"},{"text":"Electrode","value":"C"},{"text":"Negative charges","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252925,"question":"The reaction which is responsible for the production of electricity in the voltaic cell is","choices":[{"text":"Hydrolysis","value":"A"},{"text":"Oxidation","value":"B"},{"text":"Reduction","value":"C"},{"text":"Redox","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252924,"question":"The element with highest E°red","choices":[{"text":"N","value":"A"},{"text":"F","value":"B"},{"text":"O","value":"C"},{"text":"CI","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252923,"question":"If a salt bridge is removed from two half cells the emf is","choices":[{"text":"Increased","value":"A"},{"text":"Decreased","value":"B"},{"text":"Dropped to zero","value":"C"},{"text":"Electrodes will be reversed","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252922,"question":"SHE acts as anode when connected with Cu electrode but act as cathode with Zn electrode","choices":[{"text":"Zn has less reduction potential than hydrogen and Cu","value":"A"},{"text":"<div>Zn has high reductionl potential than hydrogen</div><div>and Cu</div>","value":"B"},{"text":"<div>Zn is below electrochemical series than hydrogen and Cu</div><div><br></div>","value":"C"},{"text":"Zn has least tendency to lose electron","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252921,"question":"The electrochemical series is based on","choices":[{"text":"pH scale","value":"A"},{"text":"Redox scale","value":"B"},{"text":"Hdrogen scale","value":"C"},{"text":"Arrhenius scale","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252920,"question":"The potential of SHE is taken as zero which is avalue","choices":[{"text":"Reference","value":"A"},{"text":"Arbitrary","value":"B"},{"text":"Exact","value":"C"},{"text":"Experimental","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252919,"question":"The working condition/s for SHE","choices":[{"text":"1atm pressure","value":"A"},{"text":"1M H-solution","value":"B"},{"text":"298K temperature","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252918,"question":"The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute","choices":[{"text":"Oxidation","value":"A"},{"text":"reduction","value":"B"},{"text":"Redox reaction","value":"C"},{"text":"electrolysis","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252917,"question":"During the electrolysis of Fused NaCI, the products are","choices":[{"text":"Na and H2","value":"A"},{"text":"Na and Cl2","value":"B"},{"text":"Na and O2","value":"C"},{"text":"H2 and Cl2","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252916,"question":"The products of electrolysis of which of the followings are known","choices":[{"text":"Fused electrolyte","value":"A"},{"text":"Aqueous solution of eleetrolyte","value":"B"},{"text":"Solid electrolyte","value":"C"},{"text":"Solid metal","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252915,"question":"Coinage metals Cu. Ag, and Au are the least reactive because they have","choices":[{"text":"Negative reduction potential","value":"A"},{"text":"Positive reduction potential","value":"B"},{"text":"Negative oxidation potential","value":"C"},{"text":"Positive oxidation potential","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252914,"question":"Only those metals can replace Hydrogen from dilute acids, which have","choices":[{"text":"High negative reduction potential","value":"A"},{"text":"Low negative reduction potential","value":"B"},{"text":"High positive reduction potential","value":"C"},{"text":"low positive reduction potential","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252913,"question":"Which one of the following metals can replace the Copper from aqueous solution of its salt more easily?","choices":[{"text":"Cd","value":"A"},{"text":"Fe","value":"B"},{"text":"Zn","value":"C"},{"text":"Na","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252912,"question":"The standard reduction potential of Zinc is","choices":[{"text":"0.76V","value":"A"},{"text":"0.34","value":"B"},{"text":"-0.34V","value":"C"},{"text":"-0.76V","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252911,"question":"When a metal rod is dipped in its one molar ionie solution","choices":[{"text":"Electricity is produced","value":"A"},{"text":"Electricity is consumed","value":"B"},{"text":"Redox reaction occurs","value":"C"},{"text":"Potential difference is set up","value":"D"},{"value":"E"}],"correctAnswer":4}]