Q,1 One of the essential minerals in the human body is Salt.How much salt is in the average adult human body?
A.500 gms
B.250 gms
C.1 kg
D.Practically none
Answer:-B
Explane:-The average adult human body contains about 250 grams of salt, which is just over half a pound. If you don't have enough salt, your body suffers an electrolyte imbalance called hyponatremia.
Q.2. Which of the following substances allows for the fastest diffusion?
A. gas
B. solid
C. liquid
D. plasma
Answer ;-A
Explane :- Diffusion is fastest through gases, followed by liquid, then plasma, and lastly, solids. In chemistry, diffusion is defined as the movement of matter by the random motions of molecules. In a gas or a liquid, the molecules are in perpetual motion; for instance, in a quantity of seemingly immobile air, molecules of nitrogen and oxygen are constantly bouncing off each other. In solids, there is a miniscule degree of diffusion, which rises in proportion to the temperature of the substance.
Q.3 Electrons are produced by a chemical reaction that takes place at the:
A. anode.
B. cathode.
C. lead oxide electrode.
D. oxidizer.
E. salt bridge.
Answer:-A
Explane : As described in the text, negatively charged electrons are produced by a reaction that reduces the positively charged lead anode. The reducing agent, in turn, is oxidized by this reaction. These electrons travel through the wire to the negatively charged cathode, where they react with the sulfuric acid oxidizer and reduce it, forming lead sulfate. In a car battery, the anode is normally indicated by a red mark.
