Answer:
c. Cr
Explanation:
The compound is containing ion.
If acid reacts with it, CO_2 evolves.
therefore, Cr would form a precipitate when added to an aqueous solution of this compound. Cr2CO3 is the precipitate.
What is oxidation number for Mn in Mn2O7 ( sign and number)
2 answers:
Answer : The oxidation number of sulfur (Mn) is, (+7)
Explanation :
Oxidation number : It represent the number of electrons lost or gained by the atoms of an element in a compound.
It is generally written with the sign (+) and (-) first and then the magnitude.
When the atoms are present in their elemental state then the oxidation number will be zero.
The oxidation number of oxygen (O) in compounds is usually -2.
The given compound is,
Let the oxidation state of Mn be, 'x'
Therefore, the oxidation number of sulfur (Mn) is, (+7)
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Answer:
<u>d. a row of elements</u>
Explanation:
Elements that are in the same group, have same number of electrons and make up a column in a periodic table.
Answer:
a) The volume is 5.236x10⁻¹³L
b) The molarity of a single virus is 1.91x10¹² mol/L
c) The molarity for a 100 virus particles is 1.91x10¹⁴ mol/L
Explanation:
a) Given:
D = diameter of the cell = 10 μm
r = radius = 10/2 = 5 μm
The volume of the spherical cell is equal:
If 1 μm³ = 1x10⁻¹⁵L, then 523.6 μm³ = 5.236x10⁻¹³L
b) The molarity is:
For a single virus within the cell
c) For a 100 virus particles the molarity is: