A sample of an ionic compound contains 2.82 g Na, 4.35 g CI, and 7.83 g O. The empirical formula of this compound is:
A. NaClO2
B. NaCIO3
C. NaCIO
D. NaCIO4
Here, you may find CSS Optional Subjects MCQs. If you want to prepare MCQs of optional subjects, CSS MCQs platform is here to serve you while preparing your MCQs portion of your CSS Exam. Please practice these CSS Optional Subjects MCQs on a daily basis.
Professor Anwar told his students that air is a mixture because: suddenly a student raised his hand and said
A. it is colourless
B. oxygen can be removed from it
C. its composition is different at different altitudes
D. it has different properties from its constituents
Imagine Dr. Khan is sitting in a room. The room is closed from all sides, no entry, no exit of any gas. If the room expands suddenly then
A. he will be frightened
B. his blood pressure will decrease
C. he will feel cool
D. he will feel warmth
which of the following elements will have strongest Van Der Waal force of attraction between its molecules
A. hydrogen
B. oxygen
C. chlorine
D. nitrogen
The temperature recorded by Kelvin scale is
A. 0K
B. 273K
C. 373K
D. Absolute scale is unable to record this temperature
One liter of an unknown gas weighs 1.25 grams at S.T.P, one possible formula for the gas is
A. CO2
B. CO
C. O2
D. SO2
If pressure on a gas is increased from 2 atm to 4 atm than its volume will decrease from
A. 6L to 4L
B. 8L to 2L
C. 3L to 1L
D. 4L to 2L
- Go to the previous page
- 1
- …
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- …
- 388
- Go to the next page