Answer: Option (d) is the correct answer.
Explanation:
An electrochemical cell with the help of which chemical energy of a fuel (generally hydrogen) and an oxidizing agent (generally oxygen) are converted into electrical energy by a pair of redox reactions.
A fuel cell is able to generate electricity as long as fuel and oxygen are supplied to it.
As, hydrogen and oxygen are generally used as a fuel so, this results in the formation of water as a by-product.
Thus, we can conclude that the statement fuel cell automobiles are powered by water and the only emission is hydrogen, is FALSE about fuel cells.
Answer:
Explanation:
if he add some acids with sodium carbonate , he is going to see Bubbles of a colorless gas are evolved this related to carbon dioxide gas .
Chemical reaction
NaHCO3 + HCl ----------- NaCl +H2O + CO2
The substance that can not be broken down by chemical means is antimony.
In 1869 he published a table of the elements organized by increasing atomic mass.
Mendeleev is called the "father of the modern periodic table
stated that if the atomic weight of an element caused it to be placed in the wrong group, then the weight must be wrong. (He corrected the atomic masses of Be, In, and U)
was so confident in his table that he used it to predict the physical properties of three elements that were yet unknown.
After the discovery of these unknown elements between 1874 and 1885, and the fact that Mendeleev's predictions for Sc, Ga, and Ge were amazingly close to the actual values, his table was generally accepted.
However, in spite of Mendeleev's great achievement, problems arose when new elements were discovered and more accurate atomic weights determined.
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