Search SchoolNGR

Chemistry Past Questions and Answers

Classroom

Chemistry Questions

Question 2861:

When ice is changing to water, its temperature remains the same because the heart gained is

SchoolNGR Classroom

A Used to separate the molecules
B Lost partially to the atmosphere
C Used to increase the volume of ice
D Less than the activation energy

View Answer & Explanation

Question 2862:

Which of the following methods is suitable for preparing insoluble salts?

SchoolNGR Classroom

A Thermal decomposition
B Oxidation
C Double decomposition
D Neutralization

View Answer & Explanation

Question 2863:

Which of the following reactions is sulphur (IV) oxide acting agent?

SchoolNGR Classroom

A 2HNO <sub style='font-size: smaller;'>3(aq)</sub> + SO<sub style='font-size: smaller;'>2(g)</sub> â†’ H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4(aq)</sub> + 2NO<sub style='font-size: smaller;'>2(g)</sub>
B 2KMnO <sub style='font-size: smaller;'>4(aq)</sub> + 5SO<sub style='font-size: smaller;'>2(g)</sub> + 2H<sub style='font-size: smaller;'>2</sub>O → K<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4(aq)</sub> +MnSO<sub style='font-size: smaller;'>4(aq)</sub> 2H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4(aq)</sub>
C FeCI<sub style='font-size: smaller;'>3(aq)</sub> + SO<sub style='font-size: smaller;'>2(g)</sub> + 2H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(l)</sub> â†’ FeCI <sub style='font-size: smaller;'>2(g)</sub>+ 2HCI<sub style='font-size: smaller;'>(g)</sub> + H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4(aq)</sub>
D 2H<sub style='font-size: smaller;'>2</sub>S<sub style='font-size: smaller;'>(g)</sub> + SO<sub style='font-size: smaller;'>2(g)</sub> â†’2H<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(l)</sub> + 3S<sub style='font-size: smaller;'>(s)</sub>

View Answer & Explanation

Question 2864:

Which of the elements will burn in excess oxygen to form a product that is neutral to litmus?

SchoolNGR Classroom

A Carbon
B Hydrogen
C Sulphur
D Sodium

View Answer & Explanation

Question 2865:

The main difference between a primary cell and a secondary cell is that the primary cell

SchoolNGR Classroom

A Is an electrolytic cell but the secondary is not
B Cannot be recharged but the secondary cell can
C Can be recharged but the secondary cell cannot
D Contains electrodes but the secondary cell does not

View Answer & Explanation

Stay Updated

Follow us on:

Subjects