[{"id":110182,"question":"Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is","choices":[{"text":"C<sub>3</sub>H<sub>4</sub>O<sub>3</sub>","value":"A"},{"text":"C<sub>2</sub>H<sub>4</sub>O<sub>3</sub>","value":"B"},{"text":"C<sub>3</sub>H<sub>5</sub>O<sub>4</sub>","value":"C"},{"text":"C<sub>2</sub>H<sub>3</sub>O<sub>1</sub>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110181,"question":"The percentage of H is the highest in","choices":[{"text":"CH<sub>4</sub>","value":"A"},{"text":"NH<sub>3</sub>","value":"B"},{"text":"H<sub>2</sub>SO<sub>4</sub>","value":"C"},{"text":"C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110180,"question":"Mass spectrometer measures the","choices":[{"text":"Exact mass of an element","value":"A"},{"text":"Average mass of an element","value":"B"},{"text":"The number of elements present in a molecule","value":"C"},{"text":"m/e value of a positive ion","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":110179,"question":"The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas","choices":[{"text":"142 g","value":"A"},{"text":"71 g","value":"B"},{"text":"35.5 g","value":"C"},{"text":"18.75 g","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110178,"question":"Relative atomic mass of an element is the mass of the element relative to","choices":[{"text":"1/12 mass of carbon-12","value":"A"},{"text":"1/12 mass of carbon","value":"B"},{"text":"1 mass of hydrogen atom","value":"C"},{"text":"1/16 mass of oxygen","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110177,"question":"X-ray work has shown that the diameters of atom are of the order of","choices":[{"text":"8 x 10<sup>-10</sup>m","value":"A"},{"text":"2 x 10<sup>-10</sup>m","value":"B"},{"text":"8 x 10<sup>-8</sup>m","value":"C"},{"text":"2 x 10<sup>-8 </sup>m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110176,"question":"A molecular ion is formed by","choices":[{"text":"Passing a high energy electron beam through gaseous molecule","value":"A"},{"text":"Dissolving a salt i dilute acid","value":"B"},{"text":"Passing electric current through molten salt","value":"C"},{"text":"Passing electricity through aqueous solutions","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110175,"question":"A beaker contains 9 grams of water. The number of H atoms is","choices":[{"text":"6.02 x 10<sup>23</sup>","value":"A"},{"text":"3.01 x 10<sup>23</sup>","value":"B"},{"text":"6.02 x 10<sup>24</sup>","value":"C"},{"text":"3.01 x 10<sup>24</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110174,"question":"Where energy is released during a reaction it is","choices":[{"text":"Exothermic reaction","value":"A"},{"text":"Endothermic reaction","value":"B"},{"text":"A free radical reaction","value":"C"},{"text":"A bond breaking reaction","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110173,"question":"Al<sup>3+</sup>is a symbol for aluminium","choices":[{"text":"Atom","value":"A"},{"text":"Ion","value":"B"},{"text":"Cation","value":"C"},{"text":"Anion","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110172,"question":"Which of the following statement is correct for a chemical reaction to occur molecules of substances must","choices":[{"text":"Collide with each other","value":"A"},{"text":"Collide with energy more than activation energy","value":"B"},{"text":"Collide with energy less than activation energy","value":"C"},{"text":"Collide with high frequency","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110171,"question":"Each molecule of haemoglobin is 68000 times heavier than one atom of","choices":[{"text":"C","value":"A"},{"text":"H","value":"B"},{"text":"N","value":"C"},{"text":"O","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110169,"question":"A molecule of haemoglobin is made up if nearly","choices":[{"text":"10,000 atoms","value":"A"},{"text":"50,000 atoms","value":"B"},{"text":"2500 atoms","value":"C"},{"text":"1500 atoms","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110167,"question":"Which one of the following statements is not correct","choices":[{"text":"A molecule is the smallest particle of an element which can exist independently","value":"A"},{"text":"He is a molecule of helium","value":"B"},{"text":"S<sub>8</sub>is a molecule of sulphur","value":"C"},{"text":"O<sub>3</sub>is a molecule of oxygen","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":110166,"question":"Objects of the size of an atom can be observed in","choices":[{"text":"An electron microscope","value":"A"},{"text":"An x-ray spectrum","value":"B"},{"text":"Atomic absorption spectrum","value":"C"},{"text":"A visible spectrum","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110165,"question":"The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to","choices":[{"text":"1.661 x 10<sup>-27- Kg</sup>","value":"A"},{"text":"1.661 x 10<sup>-24</sup>Kg","value":"B"},{"text":"1.661 x 10<sup>-27- g</sup>","value":"C"},{"text":"1.661 x 10<sup>-24</sup>mg","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110164,"question":"The wave length of visible light is 500 nm. In S.I. unit this value is","choices":[{"text":"5 x 10<sup>-8</sup>m","value":"A"},{"text":"5 x 10<sup>-9</sup>m","value":"B"},{"text":"500 x 10<sup>-7</sup>m","value":"C"},{"text":"500 x 10<sup>-9</sup>m","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":110163,"question":"Which of the sub-atomic particles is not charged","choices":[{"text":"Electron","value":"A"},{"text":"Proton","value":"B"},{"text":"Neutron","value":"C"},{"text":"All of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110161,"question":"The atom of an element is","choices":[{"text":"The smallest particle","value":"A"},{"text":"The fundamental particle","value":"B"},{"text":"The independent particle","value":"C"},{"text":"The charged particle","value":"D"},{"value":"E"}],"correctAnswer":1}]