Sample of CHEMISTRY Exam Questions for High school (SS2)


SECTION A (OBJECTIVE) 30 marks

1.     The ability for chemical substance to dissolve in aqueous solutions to produces ions is termed (a) Ionizzation (b) ionic potential (c) ionization (d) periodicity
2.     The ability for chemical substance to conduct electricity is term_______
3.     A base that is soluble in aqueous solution is termed  (A)Acid B)  Alkalis     C)  salt D)  Crystals
4.     The group 7 elements are generally nick-named as (a)alkali metals (b) aline earth metals (c)noble gases (d)halogens
5.     The variation of the physical and chemical properties of element both across the period and down the group of the periodic table is termed? (A) Periodicity (B) Periodic law (C) Periodic table (D)Periodic moment
6.     Oxidation and reduction reaction occurs together because  of _____

7.     The valency of Oxygen atom in a neutral state is (A) -2 (B)+2 (C)2 (D)1
8.     How many Valence electrons are found in the outermost shell of  Chlorine atom (A) 17 (B)10 (C)7 (D)70
9.     Elements in the same group in the periodic table possess (A) Variable oxidation state (B) Similar chemical and physical properties (C)The same number of octet configuration (D)The same number of ionic electrosphere
10.      Determine the Oxidation state of Sulphure in SO42-  (A) -6 (B) +5 (C)+6 (D)3
11.    During electrolysis, the anions migrate to (a) anode (b) cathode (c) electrode (d) electrylic cations
 12.   The electronic configuration of an element is 287, how many unpaired electrons are they (a)4 (b)5 (c)2 (d) none of the above
13.   The colour of blue litmus paper in an Acid medium is (A) Red (B) Blue (C) Purple (D) Pink
14The energy required to remove the most loosely bounded electron from the outermost shell of a gaseous atom is termed________
15. The element whose electronic configuration is 1s2 2s2p6 is (A) Carbon (B) Nitrogen (C) Sulphure (D) Neon
16.     The element whose electronic configuration is 1S2 2S2 2P6 3S2 belongs to which period and group in the periodic table (A)Period 2 group 5 (B) Period 3 group 2 (C)Period 2 group 2 (D) Period 3 group 3
17.     The number of replaceable hydrogen ions or atom in a corresponding acidic compound is referred to as (A) Acidity (B) Basicity (C) Alkalinity (D) Neutrality
18.     In the electrolysis of water what are the cations discharged_____ and _____
19.                        When the group one metals react with acid what are the products _______   _____ and ___
20.                        Why are the group 4 elements the p-block elements?
21.                        Which group of elements are regarded as the salt formers in the periodic table (A) Group 1 (B) Group 2 (C) Group 7 (D) Group 0
22.                          The presence of Nitrogen in the atmosphere is responsible for (a) oxidation (b) combustion (c) reduced irritability (d) reduced combustion

23. one farad of  electricity is equivalent to (a) 965000C (b) 197999 (c)1996500 (d) all of the above (e) none of the above
 24. When an element exist in two or more forms in the same physical state, the element is said to exhibit    a. Isotope   b. Isomerism   c. Allotropy    d. Hygroscope
  25. The loss of electrons in a redox reaction is termed (a) redox reaction (b) reduction (c) oxidation (d) ionization
26. one mole of electrons is equivalent to (a) one of element (b) one farad (c) one faraday  (d) one coloumbs
27. The group 4 elements exhibit_________ oxidation state (a) 1 (b)2 (c) 3 (4) (d) 5
28. s-block element in the periodic table are made  up of (a) group 1 and 3 (b) group 3 and 4 (c) group 1 and 2 (c) group 0 and 2
29. The mass of silver deposited  when a current of 2.6A is passed through a solution of a silver salt for 70minute (Ag=108 ) (a) 10g (b) 20g (c) 12.67g (d) 12.22g
30.The composition of oxygen and Nitrogen  in the atmosphere is ________ and _______




SECTION B (Theory) 40 marks
INSTRUCTION:  Answer four questions only
1.     State the first and second laws of electrolysis
b. Define one faraday
c. What are Redox reactions? Write an equation to show a typical redox reaction

2.     An element has  11 proton, determine the group and period  it belongs to
b. write down the electronic configuration
c. State four properties of the noble elements
d. differentiate between group and period
c. State Arrhenius theory
d. Where does oxidation take place during electrolysis?

3.     Calculate the mass of copper deposited  when a current of 7A is passed through a solution of a copper salt for 10minute  20 seconds (cu=65.5g)
b. List the factors that influence the preferential discharge of ions during electrolysis and explain 2 of them

4.     Draw the electrochemical series of both cations and anions
b. State the periodic law
c. Mg + O2 --------------------2MgO Identify the reducing and oxidizing agents

5.     List 4 examples of electrolytes and non electrolytes
b. Why are the group 2 elements referred to as alkaline earth metals
c. explain how does electronic affinity and atomic radius varies in the periodic table and give reasons













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