Chemistry Chapter 1 Entry Test MCQs
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Topic no.1
Fundamental Concepts
1. H2 gas is filled in 11.2 liter gas container at 0oC and 1 atmosphere. The number of molecules of H2 gas are
a. 3.01 x 1023
b. 6.02 x 1023
c. 1.505 x 1023
d. 12.04 x 1023
2. Keeping electric field constant, if magnetic field is doubled, then the radius of curvature of molecular cation in mass spectrometer will:
a. Decreases four times
b. Increases four times
c. Increases two times
d. Decreases two times
3. The mass of 1/12 of C-12 comes out to be
a. 1-gram atom
b. 1 gram
c. 1 mole
d. 1 amu
4. Which of the following quantity is same for 1 mole each of Nitric oxide and Nitrogen dioxide?
a. O-atoms
b. N-atoms
c. electrons
d. total atoms
5. Which term is most appropriate to describe the mole of water?
a. g formula
b. g atom
c. g ion
d. g molecule
6. An atom of a specie weighs 39 amu, the atom is
a. N
b. He
c. Mg
d. K
7. Of the following sets which one does not contain isoelectronic species?
a. SO32-, CO32-, NO3–
b. PO43-, SO42-, CIO4–
c. BO33-, CO32- , NO3–
d. CN–, N2, C2-2
8. In which of the following pair both the species are isoelectronic but the first one is large in size than the second?
a. [F–, Na+]
b. [S2-, O2-]
c. [N3-, P3-]
d. [Cl–, S2-]
9. The ion that isoelectronic with CO is
a. O2–
b. CN–
c. N2+
d. O2+
10. The compound in which cation is iso-electronic with the anion is
a. CsF
b. NaCl
c. NaF
d. Nal
11. An atom has a net charge of -1 it has 18 electrons and 20 neutrons. Its mass number is
a. 37
b. 38
c. 20
d. 39
12. Which one of the following sets of ions represents the collection of isoelectronic species?
a. K+, Cl–, Mg2+, Sc3+
b. K+, Ca2+, Sc3+, Cl–
c. Na+, Mg2+, Al3+, CI–
d. Na+, Ca2+, Sc3+, F–
13. Two nuclides X and Y are isotonic to each other with mass number 70 and 72 respectively. If the atomic number of X is 34, then that of Y would be
a. 36
b. 32
c. 38
d. 34
14. Which of the following will have same number of electrons as alpha particles?
a. H+
b. Li+
c. Be+
d. He
15. Which of the following is not macromolecule?
a. Maltose
b. Hemoglobin
c. Cellulose
d. Lipoprotein
16. Which set represents pure compounds only
a. Glucose, Sucrose, water gas
b. Air, Alloy, Table salt.
c. Milk, aspartame, serotonin
d. None
17. Haemoglobin molecule is _ times then heavier H2
a. 1000
b. 10, 000
c. 34,000
d. 68, 000
18. Which of the following elements has maximum number of isotopes?
a. Cd
b. Ca
c. Sn
d. Pd
19. Fractional atomic masses can be calculated from
a. Relative abundance of isotopes
b. Number of peaks
c. Average mass of isotopes
d. Number of isotopes
20. Which of the following statement is wrong about isotopes?
a. They possess different physical properties
b. They possess different mass number
c. They possess different position in the periodic table
d. They possess same chemical properties
21. Total number of radioactive isotopes produced through artificial disintegration
a. 300
b. 240
c. 340
d. 40
22. Bromine has two isotopes having relative abundance as and the average atomic mass of bromine is about
a. 80
b. 81
c. 80.5
d. 79
23. Which one of the following has maximum number of isotopes?
a. S
b. Na
c. Ni
d. Cd
24. An atom of carbon is twelve times heavier than __ atom
a. He
b. H
c. Li
d. Ne
25. How many numbers of electrons are present in 4.2g of azide ion?
a. 21 NA
b. 2.1 NA
c. 22 NA
d. 2.2 NA