Chemistry 10th Class English Medium Unit 12 Online Test With Answers

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Chemistry 10th Class English Medium Unit 12 Online Test

Sr. # Questions Answers Choice
1 Oxidation of alkenes produce. Glyoxal Glycol Oxalic acid Formic acid
2 The order of reactivity of hydrogen halides with alkenes is. HI>HBr HBr>HI HCl>HBr HBr < HCl
3 In which one of the following is a substitution reaction? Halogenations of alkynes Halogenations of alkenes Halogenations of alkanes Bromination of alkenes
4 Halogenation of alkanes in the presence of diffused sunlight takes place. Suddenly, only in one step Slowly in one step In a series of step Fastly in two steps
5 Substitution reaction is the characteristics of. Alkanes Alkenes Alkynes None of these
6 Dehalogenation of tetrahalides produces acetylene. This reaction takes place in the presence of Sodium metal Zinc metal Magnesium metal Potassium metal
7 The end product of oxidation of acetylene is . Oxalic acid Glyoxal Glycol None of these
8 Dehydration of alcohols can be carried out with. NaOH KOH H<sub>2</sub>SO<sub>4</sub> HCl
9 One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What formula could be of the X. C<sub>3</sub>H<sub>8</sub> C<sub>6</sub>H<sub>12</sub> C<sub>4</sub>H<sub>10</sub> C<sub>7</sub>H<sub>16</sub>
10 The molecular formula of the first three members of the alkane hydrocarbons are CH4,C2H6 and C3H8. What is the molecular formula for the eight alkane member, octane, which is found is petrol? C<sub>8</sub>H<sub>8</sub> C<sub>8</sub>H<sub>16</sub> C<sub>8</sub>H<sub>18</sub> C<sub>8</sub>H<sub>20</sub>
11 A hydrocarbon has molecular formula C8H14. What is the molecular formula of the next number of the same homologous series. C<sub>9</sub>H<sub>18</sub> C<sub>9</sub>H<sub>16</sub> C<sub>9</sub>H<sub>20</sub> C<sub>9</sub>H<sub>12</sub>
12 Which one of these is a saturated hydrocarbon? C<sub>2</sub>H<sub>4</sub> C<sub>3</sub>H<sub>6</sub> C<sub>4</sub>H<sub>8</sub> C<sub>5</sub>H<sub>12</sub>
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