1.True or false A. Fertilizers are the only source of water pollution. B. All is

Question

1.True or false

      A. Fertilizers are the only source of water pollution.

B. All isotopes are radioactive.

   C. Ozone is a form of oxygen

D. When an atom emits a beta particle it becomes a different element.

E. At the same temperature in the same size container 20g of O2 gas has the same pressure as 20g of Cl2 gas.

F. The two major components of air are oxygen and nitrogen

G   Two gases that contribute to acid rain are NH3 and CH4.

H. A water solution with pH5 has a higher [H+] than a water solution With pH2.

I.    Doubling the Kelvin temperature doubles the pressure of gas In a container.   

J.   Automobile catalytic converters change CO2 to CO.

Explanation / Answer

(A) False

Fertilizers are not the only source of water polution since the factories waste products are also dumped into water that produces water polsution.

(B) False

Isotopes are the different forms of same element that have equal number of protons but different number of neutrons. Some of thesewould be stable and of these would not be more stable but it does not mean they all are radioactive.

(C) True

Ozone is O3 and this molecule contains three oxygen atoms and hence it is a form of oxygen.

(D) True

When an element emits a beta particle it's atomic number increases by one but the mass number remains the same. In periodic table elements are placed on the basis of atomic numbers. Since the atomic numbers are different, they are different elements.

(E) False

at constant temperature and volume, pressure is directly proportionla to the number of molecules of the gas. given mass of both the gases are equal but their molar masses are different. molar mass of Cl2 is greater than molar mass of O2, so the moles of O2 will be greater than Cl2 and hence the pressure of O2 would also be greater than Cl2.

(F) True

Air is a mixture of many gases out of which N2 is around 78% and O2 is around 20.9%. sum of these two is 98.9% that means these two are the major components of air.

(G) False

Acid rain is mainly caused by the presence of SO2 and nitrogen oxides in the atmosphere. SO2 on reacting O2 forms SO3 that get dissolved in water and form sulfuric acid.

Nitrogen oxides would react with H2O to form nitrous acid(HNO2) or nitric acid(HNO3).

(H) False

pH = - log[H+ and so, [H+] = 10^-pH

when pH is 5 then, [H+] = 10^-5 and when the pH is 2 then [H+] is 10^-2. Since 10^-2 is greate than 10^-5, so the solution with pH 2 would have higher [H+] concentration.

(I) True

pressure of a gas at constant volume is directly proportional to the kelvin temperature. That means if temperature is increased then pressure is also increased and vice versa.

(J) False

CO (carbon monoxide) is a very poisonous gas. Catalytic converters oxidizes this CO into CO2.

2CO + O2 ------> 2CO2

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