Search SchoolNGR

Chemistry Past Questions and Answers

Classroom

Chemistry Questions

Question 766:

Argon is used in gas-filled electric lamp because it helps to?

SchoolNGR Classroom

A Prevent the reduction of the lamp fillaments
B Prevent oxidation of the lamp fillaments
C Make the lamp fillament glow brightly
D Keep the atmosphere in the lamp inert

View Answer & Explanation

Question 767:

The air around a petroleum refinery is most likely to contain?

SchoolNGR Classroom

A CO<sub style='font-size: smaller;'>2</sub>, SO<sub style='font-size: smaller;'>3</sub> and N<sub style='font-size: smaller;'>2</sub>O
B CO<sub style='font-size: smaller;'>2</sub>, CO and N<sub style='font-size: smaller;'>2</sub>O
C SO<sub style='font-size: smaller;'>2</sub>, CO and NO<sub style='font-size: smaller;'>2</sub>
D PH<sub style='font-size: smaller;'>3</sub> H<sub style='font-size: smaller;'>2</sub>O and CO<sub style='font-size: smaller;'>2</sub>

View Answer & Explanation

Question 768:

Water can be identified by the use of?

SchoolNGR Classroom

A Anhydrous copper (II) tetraoxosulphate (VI)
B Anhydrous sodium trioxocarbonate (IV)
C Potassium heptaoxochromate (VII)
D Copper (II) trioxocaronate (IV)

View Answer & Explanation

Question 769:

The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as?

SchoolNGR Classroom

A Deliquescene
B Hygroscopy
C Effervescence
D Efflorescence

View Answer & Explanation

Question 770:

A student prepares 0.5 M solution each of hydrochloric and ethanoic acids and then measured pH. The result would show that the?

SchoolNGR Classroom

A PH values are equal
B HCI solution has a higher pH
C Sum of the values is 14
D Ethanoic acid solution has a higher pH

View Answer & Explanation

Stay Updated

Follow us on:

Subjects