Which of the following methods can be used to seperate blood cells from plasma?
Centrifugation
Filtration
Chromatography
Distillation
Correct answer is A
No explanation has been provided for this answer.
+2 to +3
0 to +2
+3 to +2
+3 to 0
Correct answer is C
The oxidation number of Iron in FeCl3 = +3. The oxidation number in FeCl2 = +2.
The empirical formula of a compound containing 0.067mol Cu and 0.066mol O is [Cu = 63.5, O = 16]
Cu2O
CuO
CuO2
CuO4
Correct answer is B
Cu : O
0.067 : 0.066
mole ratio 0.0670.066 : 0.0660.066
= 1 : 1
= CuO
oxidised
reduced
decomposed
dissociated
Correct answer is A
Reaction: 2AgNO3+Zn→Zn(NO3)2+2Ag
The oxidation number of Zn in the reactant is 0, and in the product is +2. Therefor, it is oxidized.
The strength of metallic bonds depends on the
charge density of the atoms
ductility of the metal
number of valence electrons
total number of electrons in the atom
Correct answer is C
It is determined by the difference in the electron structures of the atoms. These primarily are: The number of outer electrons, i.e the number of valence shell electrons released during a metallic bond.