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Some Basic Concepts of Chemistry Test - 19

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Some Basic Concepts of Chemistry Test - 19
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  • Question 1
    1 / -0
    What is the volume of $$3.0\times {10}^{20}$$ molecules of $$HCl (g)$$?
    Solution
    $$1 \space Mole$$ of gas at STP occupy $$22.4 \space Litres$$ of gas
    As, $$1 \space Mole = 6.02 \times 10^{23}$$ molecules $$\Rightarrow 22.4 Litres$$ 
    $$3.0 \times 10^{20}$$ molecules $$\Rightarrow (X)$$ 
    $$\Rightarrow X = \dfrac{22.4 \times 3 \times 10^{20}}{6.02 \times 10^{23}} = 0.0112\space L$$
  • Question 2
    1 / -0

    Geochemistry is :

    Solution
    Geochemistry is the study of the chemical composition and changes in rocks, minerals, and atmosphere of the earth or a celestial body.

    Hence option B is correct.
  • Question 3
    1 / -0
    According to Indian and Greek philosophers at 400 B.C. ,the continuous sub-division of matter would ultimately yield _______.
    Solution
    According to Indian and Greek philosophers at 400 B.C., the continuous subdivision of matter would ultimately yield atom.
  • Question 4
    1 / -0
    How many moles are present in $$6.023\times 10^{22}$$ molecules of $$CO_2$$?
    Solution
    1 mole of $$CO_2$$ contains 1 $$N_A$$ molecules. ( $$N_A=6.023\times10^{23}$$)
    Moles present in given sample are: $$6.023\times10^{22}\div N_A=0.1$$
  • Question 5
    1 / -0
    This is the branch of chemistry deals with chemistry of elements other than carbon and of their compounds :
    Solution
    Inorganic chemistry deals with chemistry of elements other than carbon and of their compounds. Chemistry of Carbon is called as organic chemistry.
  • Question 6
    1 / -0
    Determine the mass by mass percentage concentration of a 100g salt solution which contains 20g salt.
    Solution
    Solution:- (B) $$20 \%$$
    As we know that,
    $$\text{mass by mass percent} = \cfrac{\text{ Wt. of salt}}{\text{Total wt. of salt}} \times 100$$
    Given that:-
    Weight of salt = 20 g
    Total weight of salt = 100 g
    $$\therefore \text{ mass by mass percent} = \cfrac{20}{100} \times 100 = 20 \%$$
  • Question 7
    1 / -0
    Uncertainty Principle was given by:
    Solution
    Heisenberg was the scientist who had given the principle of uncertainty. According to his principle position and velocity of an object can not be measured at the same time.

    Hence, the correct option is $$A$$
  • Question 8
    1 / -0
    Who proposed atom as an indestructible entity?
    Solution

    Dalton's Atomic Theory

    1. All matter is made of atoms. Atoms are indivisible and indestructible.
    2. All atoms of a given element are identical in mass and properties
    3.  Compounds are formed by a combination of two or more different kinds of atoms.

    Hence, option $$B$$ is correct.
  • Question 9
    1 / -0

    Who is given the credit for creation of first nuclear reactor.

  • Question 10
    1 / -0
    Which one of the following scientist's proposed the law of conservation of mass?
    Solution
    The law of conservation of mass is given by John Dalton which states that mass can neither be created nor be destroyed in a chemical reaction.
    option $$B$$ is correct.
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