Endothermic Reactions Quiz Questions and Answers PDF Download - 149

Endothermic reactions take place when

1. energy given out in making bonds is less than the energy taken in for breaking bonds
2. energy given out in making bonds is more than the energy taken in for breaking bonds
3. energy given out in making bonds is equal to the energy taken in for breaking bonds
4. none of above

Paraffin is an example of

1. strong electrolyte
2. non-electrolyte
3. weak electrolyte
4. catalyst

The chemical formula of aluminum nitrate is

1. AlNi₃
2. Al₃Ni₂
3. Al(NO₂)₃
4. Al(NO₃)₃

In the electrolysis of aqueous solutions of dilute acids or dilute alkalis, the amount of hydrogen given off is roughly

1. half of the oxygen given off at the anode
2. same as of oxygen given off at anode
3. twice the oxygen given off at anode
4. twice the oxygen given off at cathode

Mass of an element in a compound can be calculated through

1. Ar of the atoms/Mr of the compound
2. Mr of the atoms/Ar of the compound
3. (Ar of the atoms/Mr of the compound) × mass of sample
4. (Ar of the atoms/Mr of the compound) × mass of sample