IIT FOUNDATION
Test – 3 (X std)
Name-_______________________________ Marks: 25m
I. Answer the following :
1) Write the Arrhenius theory of acids and bases.
2) What is Ionic product of water? Give its value at 25oC.
3) What is heat of neutralisation? Give an example.
4) Distinguish between H+ and [H+]
5) Why is pure water neutral ?
6) Calculate the pH of 0.02 M.HCI.
7) Calculate the pH of 0.001 M H2SO4.
8) Calculate the pH of 0.002 Ba(OH)2.
9) 0.56gm of KOH dissolved in 200ml of Soln
II. Choose the correct answer :
10) The colour of methyl orange indicator on acidic medium is [ ]
(A) yellow (B) green (C) orange (D) red
11) The colour of phenolphthalein indicator in basic solution is [ ]
(A) Yellow (B) green (C) pink (D) orange
12) The pH of solution whose [H+] is 1 x 10-4 is : [ ]
(A) 1 (B) 10 (C) -4 (D) +4
13) The value of Kw changes with changing : [ ]
(A) [H+] (B) [OH-] (C) temperature (D) pressure
14) The concept of pH was introduced by [ ]
(A) Sorensen (B) Lewis (C) Guldberg and wage (D) Arrhenius
15) The heat of neutralisation for a strong acid and a strong base is : [ ]
(A) 13.7 k.cal (B) 13.4 k.cal. (C) 0 k.cal. (D) 0.3 k.cal.
16) [H+] x [OH-] is called ionic product of water (Kw).Kw = ___________________ 50oC.


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