The rectified spirit is________________?
A. 12% alcohol
B. 90% alcohol
C. 95% alcohol
D. 100% alcohol
Chemistry Basic Concept
As a substance moves from a solid to a liquid all of the following changes occur except ?
As a substance moves from a solid to a liquid all of the following changes occur except ?
A. molecules become more disordered.
B. K.E of the molecules decreases
C. intermolecular forces become weaker.
D. molecules move more frequently.
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 ?
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 ?
A. 20cm3/min
B. 40cm3/min
C. 160cm3/min
D. 2.5cm3/min
Methyl alcohol is not used as___________________?
Methyl alcohol is not used as___________________?
A. a solvent
B. an anti freezing agent
C. a substitute for petrol
D. for denaturing of ethyl alcohol
All the following variables are used to describle gases except__________________?
All the following variables are used to describle gases except__________________?
A. pressure
B. volume
C. moles
D. density
Dempsters mass spectrometer has number of zones / parts_________________?
Dempsters mass spectrometer has number of zones / parts_________________?
A. 5
B. 4
C. 3
D. 2
When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?
When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?
A. 0.5
B. 1
C. 1.5
D. 2
The nucleus of an atom of every element will always contain____________________?
The nucleus of an atom of every element will always contain____________________?
A. neutrons
B. protons and electrons
C. protons
D. protons and neutrons
Which of the following methods is used to estimate hydrogen in an organic compound ?
Which of the following methods is used to estimate hydrogen in an organic compound ?
A. Combustion method
B. Dumas method
C. Kjeldahls method
D. All of the above methods are for different purposes
Isotopes differ in_________________?
Isotopes differ in_________________?
A. properties which depend upon mass
B. arrangement of electrons in orbitals
C. chemical properties
D. all of the above