Question

1.True or false

      A. All compounds that contain hydrogen are acids..

      B. A solution with a pH of 5 has 10 times higher [H⁺] than a

      Solution with a pH of 6.

      C. SO₃ in the atmosphere is one cause of acid rain.                  

      D. Agricultural chemicals are the only cause of water pollution.

      E. One function of an auto catalytic converter is to convert CO₂ to CO

      F. The major elements in air are nitrogen and oxygen

      G As a radioactive isotope decays its half life changes.

      H. In the same size container at the same temperature, 25g of N₂ gas

                       has the same pressure as 25g of NH₃ gas..

     I    Chloroflurocarbon compounds are considered to be a prime cause of

                      ozone depletion in the stratosphere.

       J.   Beta radiation from an atom is the emission of a valence electron.

Answer 1

   A. ) All compounds that contain hydrogen are acids.

        Answer : False   :

explanatio: NaOH , Ca(OH)2 , Al(OH)3 contain hydrogens but these bases not acids

      B. ) A solution with a pH of 5 has 10 times higher [H⁺] than a Solution with a pH of 6.

Answer : True

explanation:   we know the pH = -log[H+]

                                           [H+] = 10^-pH

           pH= 5 means [H+] = 10^-5 M

          pH= 6 means [H+] = 10^-6 M

       so pH=5 has 10 time more [H+] concentration than pH=6

      C. ) SO₃ in the atmosphere is one cause of acid rain.  

         Answer : True

          when rain comes water react with SO3 form sulfuric acid . it is caused to acid rain

       SO3 + H2O ------------------------> H2SO4

      D.) Agricultural chemicals are the only cause of water pollution.

Answer : False

Agricultural chemicals are the one of the cause of water pollution. there are lot of reasons to cause water polution. example human wastage, in the cleanig process of cloths we generally use detergents these are also wter pollutants.

   

   E. ) One function of an auto catalytic converter is to convert CO₂ to CO

     Answer : False

auto catalytic converter is to convert CO to CO₂

      F.) The major elements in air are nitrogen and oxygen

   Answer : True

   N2 nearly -------78.08% and O2 nearly 20.095%. remaing gases Ar , CO2 etc present only small amount

      G ) As a radioactive isotope decays its half life changes.

         Answer : False

     half is characterstic of radioactive isotope. it doesn't change with decay process,

      H.) In the same size container at the same temperature, 25g of N₂ gas has the same pressure as 25g of NH₃ gas..

      Answer : False

from ideal gas equation PV= nRT

                                     PV = w RT/ M

                                     P 1/M   (remaing all terms are constant)

pressure is molar mass dependent . molar mass increase pressure decrease .

     I   ) Chloroflurocarbon compounds are considered to be a prime cause of ozone depletion in the stratosphere.

      Answer : True

Chloroflurocarbons like CF2Cl2 . CFCl3 produce free radical in the atmsopher in presence of UV light. they react with O3 layer causes ozone deplition.

       J.) Beta radiation from an atom is the emission of a valence electron.

Answer : True