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.Management Sciences
Category: Chemistry Basic Concept
In the van der Waals equation (P + n2a / v2) (v – nb) = nRT which of the following statement is not true ?
A. n2a/v correct for the intermolecular forces.
B. nb correct for the volume occupied by gas molecules.
C. at high densities the equation reduces to the ideal gas law
D. all of the above statements are correct.
Qualitative analysis is carried out for _________________?
A. identification of elements
B. estimation of amounts of elements
C. molar ration of elements
D. molar volume of elements
The balanced chemical equation for the reaction which occurs when Be is added to water is____________?
A. Be+2H2O?Be (OH)2+H2
B. Be+H2O?Be (OH)2+H2
C. Be+H2O?[Be (OH)4]+2+H2
D. no reaction
Which of the following are isoelectronic species ?
A. H+ H H-
B. Li+ Na+ K+
C. C1- Br- I
D. F- Ne Na+
When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?
A. 0.33 nm
B. 0.34 nm
C. 0.35 nm
D. 0.36 nm
On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?
A. pink
B. black
C. yellow
D. brick red
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.
Which one is true about isotope ?
A. Same number of neutrons
B. Same mass number
C. Same physical properties
D. Same chemical properties
Acid present in acid rain may be_________________?
A. H2SO4
B. HNO3
C. both A and B
D. none of the above
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