Options:
- A. a solvent
- B. an anti freezing agent
- C. a substitute for petrol
- D. for denaturing of ethyl alcohol
View Answer
C. a substitute for petrol
Chemistry
The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer_________________?
Options:
- A. Gas
- B. Liquid
- C. Volatile solid
- D. All
View Answer
A. Gas
Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse ?
Options:
- A. 20cm3/min
- B. 40cm3/min
- C. 160cm3/min
- D. 2.5cm3/min
View Answer
B. 40cm3/min
Avogadros number may represent_________________?
Options:
- A. volume of particles
- B. number of particles
- C. mass of particles
- D. All of the above
View Answer
D. All of the above
As a substance moves from a solid to a liquid all of the following changes occur except ?
Options:
- A. molecules become more disordered.
- B. K.E of the molecules decreases
- C. intermolecular forces become weaker.
- D. molecules move more frequently.
View Answer
B. K.E of the molecules decreases
Size of molecule depends upon________________?
Options:
- A. Atomicity
- B. Shape of molecule
- C. Both A and B
- D. Difficult to predict
View Answer
C. Both A and B
The rectified spirit is________________?
Options:
- A. 12% alcohol
- B. 90% alcohol
- C. 95% alcohol
- D. 100% alcohol
View Answer
C. 95% alcohol
Which of the following terms is used for the mass of chlorine 35.5 ?
Options:
- A. relative atomic mass
- B. mass number
- C. atomic weight
- D. relative isotopic mass
View Answer
A. relative atomic mass
Which of the following solids show anisotropy___________________?
Options:
- A. Plastic
- B. Glass
- C. Rubber
- D. None of the above
View Answer
D. None of the above
Which one of the following is not the mono isotopic element ?
Options:
- A. arsenic
- B. uranium
- C. iodine
- D. nickel
View Answer
B. uranium