Basic Concepts Test 4

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Basic Concepts A test from chapter 1 i.e Basic Concepts of Chemistry part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.


1. Percentage of oxygen in H2O is
    A) 80%
    B) 88.8%
    C) 8.8%
    D) 9.8%


2. More abundant isotope of an element is one with

    A) even atomic no.
    B) odd atomic no.
    C) Even mass no.
    D) odd mass no.


3. Large no. of isotopes are known for the elements whose masses are multiple of

    A) 2
    B) 4
    C) 6
    D) 8


4. When 0.01 kg of CaCO3 is decomposed the CO2 produced occupies a volume at S.T.P.

    A) 2.2414 dm3
    B) 22.414 dm3
    C) 22414 dm3
    D) 224014 dm3


5. The no. of covalent bond in 10gm of NH3 are

    A) 6.022 x 10^23
    B) 1.062 x 10^23
    C) 10.62 x 10^24
    D) 1.062 x 10^24


6. No. of molecules present in 10gm of water are

    A) 3.37 x 10^23
    B) 33.7 x 10^23
    C) 3.37 x 10^24
    D) 3.037 x 10^24


7. The no. of covalent bonds present in 10gm of water are

    A) 6.074 x 10^23
    B) 6.74 x 10^23
    C) 6.074 x 10^24
    D) 6.74 x 10^24


8. The least no. of molecules present in 30 gm of

    A) N2O
    B) NO
    C) NO2
    D) N2O3


9. Which of the following has highest percentage of nitrogen

    A) (NH4)2SO4
    B) NH4H2PO4
    C) (NH4)2HPO4
    D) (NH4)3PO4


10. Simplest formula that gives us information about the simple ratio of atoms in a compound is called

    A) structural formula
    B) molecular formula
    C) empirical formula
    D) molar ratio

I am Mechatronics and Control Engineer from UET, Lahore. Helping Engineering students gives me pleasure.

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