Free Online Chemistry Science Practice Test Paper

Free Online Chemistry Science Practice Test Paper
1. The element with atomic number 9 resembles in properties with the element having atomic number
(a) 19
(b) 17
(c) 36
(d) 27
Ans. (b)

2.Which one of the following has the smallest size?
(a) Al
(b) AL+
(c) Al+2
(d) Al+3
Ans. (d)

3. The number of electrons in the outer shell of the most stable or inert atoms is
(a) 1
(b) 4
(c) 6
(d) 8
Ans. (d)

4. An atom which has a mass number of 14 and has 8 neutrons is an:
(a) Isotope of oxygen
(b) Isobar of oxygen
(c) Isotope of carbon
(d) Isobar of carbon
Ans. (c)

5. Members of which of the following have similar chemical properties?
(a) Isotope
(b) Isobars
(c) Allotropes
(d) Both isotopes and allotropes
Ans. (a)

6. For an element with atomic number 19, the 19th electron will occupy
(a) L-shell
(b) M-shell
(c) N-shell
(d) K-shell
Ans. (b)

7. A natural phenomenon that supports the experimental conclusion that atoms are divisible is
(a) Allotropy
(b) Radioactivity
(c) Cracking
(d) None of these
Ans. (b)

8. The valency of an element is
(a) The mass of the element displacing 1 part by the mass of hydrogen
(b) The mass of the element combining with 8 parts by mass of oxygen
(c) The number of toms of hydrogen combining with 1 atom of the given element
(d) The number of atoms in 1 molecule of the given element
Ans. (c)

9. The fundamental particles not present in the nucleus of hydrogen atom is
(a) electron
(b) Proton
(c) Neutron
(d) None of these
Ans. (c)

10. The maximum number of electrons that can be accommodated in M Shell of an atom are
(a) 8
(b) 32
(c) 18
(d) 25
Ans. (c)

11. The oil drop experiment by R.A. Mullikan was performed to find
(a) Charge on the neutron
(b) Charge on the electron
(c) Charge on the Proton
(d) None of these
Ans. (b)

12. The experiment which led to the discovery of nucleus was performed by
(a) Goldstein
(b) J.J. Thomson
(c) Dalton
(d) Rutherford
Ans. (d)

13. The electronic configuration of the element with Atomic number 19 is
(a) 2, 8, 7
(b) 2, 9, 8
(c) 2, 8, 8, 1
(d) 2, 10, 7
Ans. (c)

14. An element has electronic configuration 2,8,4. It will be classified as
(a) Metal
(b) Non metal
(c) Metalloid
(d) None of these
Ans. (b)

15. The element with highest electron affinity in the periodic table is
(a) Iodine
(b) Chlorine
(c) Fluorine
(d) Oxygen
Ans. (b)

16. A pH -2 solutions is more acidic than one with pH 6 by a factor of
(a) 4000
(b) 2
(c) 10000
(d) 8000
Ans. (c)

17. Which of these is a pairs of isobar?
(a) 6C12, 8O16
(b) 6C13, 6C14
(c) 20Ca40, 18Ar40
(d) None of these
Ans. (c)

18. In the reaction of Zn + FeSO4 —— ZnSO4 + Fe
(a) Zn gets oxidized
(b) Fe gets oxidized
(c) Zn is oxidized in agent
(d) Zn and Fe both get oxidized
Ans. (a)

19. Which of the following is an example of strong electrolyte?
(a) NH4OH solution
(b) NaOH
(c) CH3COONa
(d) HCN
Ans. (b)

20. The element with atomic number 9 resembles with the element having atomic number
(a) 8
(b) 17
(c) 36
(d) 27
Ans. (b)

21. The elements belonging which group called representative elements?
(a) gp 1 and 2
(b) gp 3 to 12
(c) gp 13 to 18
(d) Element lying at the bottom of periodic table
Ans. (a)

22. Which of the electropositive?
(a) H
(b) Mg
(c) Ca
(d) Si
Ans. (c)

23. With the increase in size in a group
(a) Metallic character decreases
(b) Metallic character increases
(c) Chemical reactivity decreases
(d) Chemical reactivity remains same
Ans. (b)

24. The elements of group 18 are
(a) Halogens
(b) Noble gases
(c) Chalcogens
(d) all caline earth metals
Ans. (b)

25. The properties of the elements, as well as the formula and properties of their compounds depend in a periodic manner on the atomic weights of the elements. This periodic law was given by
(a) J. Lothar Meyer
(b) John A.R. Newlands
(c) Dobemier
(d) D.I. Mendeleev
Ans. (d)