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.Management Sciences
Category: Chemistry Basic Concept
The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?
A. alkaline aquenous iodine
B. aqueous bromine
C. Fehling solution
D. aqueous NaOH
Which of the following solids show anisotropy___________________?
A. Plastic
B. Glass
C. Rubber
D. None of the above
The hardest of the following solids is__________________?
A. sodium
B. diamond
C. graphite
D. magnesium
Isotopes of the same elements has__________________?
A. different number of protons
B. same number of neutrons
C. different number of neutrons
D. same mass number (nucleon number)
The number of isotopes of elements with even mass number and even atomic number are ________________?
A. 280
B. 300
C. 154
D. 54
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
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