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CHAPTER 10
ACIDS, BASES AND SALTS
Encircle the most appropriate answer from among the following option
1 Nitric acid was prepared by
(a) Bu Ali Sina
(b) Jabir Bin Hayan
(c) Lavioser ,
(d) Humphrey
2 The first acid known to man was:
(a) hydrochloric acid
(b) sulphuric acid
(c) nitric acid
(d) acetic acid
3 The word acid is derived from
(a) acidic
(b) acidus
(c) acetic
(d) acetate.
4 Humphrey Davy proved the presence of as the main constituents of all acids
(a) nitrogen;
(b) oxygen
(c) hydrogen
(d) chlorine
5 Formula of phosphoric acid is:
(a) H2PO3
(b) H4PO3
(c) HPO4
(d) H3PO4
6. Al(OH)3 is:
(a) acid
(b) base
(c) salt
(d) non-metallic oxide
7. Which is amphoteric:
(a) HCS
(b) NH3
(c) NaOH
(d) H2O
8. The product of any Lewis acid base reaction is a single specie:
(a) salt
(b) adduct
(c) salt +H2O
(d) conjugate acid-base pair
9 In a reaction between ammonia & borontrifloride , BF3 is
(a) acid
(b) base
(c) conjugate base
(d) adduct
10. These can act as Lewis acids
(a) anions
(b) radicals
(c) cations
(d) molecule
11. Bronsted lowery acid
(a) gives H+
(b) electron pair acceptor
(c) donates OH–
(d) donates H+
12.. All bronsted bases are
(a) arrhenius bases
(b) Lewis acids
(c) Lewis base
(d) bronsted acids
13. The final product of arrhenius concept is
(a) salt +H2O
(b) adduct
(c) conjugate acid base pair
(d) salt only
14. Neutralization is reaction of
(a) acid with metals
(b) acids with sulphides
(c) bases with acids
(d) none of them
15. Acid used for food preservation:
(a) nitric acid
(b) benzoic acid
(c) acetic acid
(d) Both b and c
16. Maleic acid is found from
(a) apples
(b) grapes
(c) sour milk
(d) fats
17. Acid reacts with metal sulphides to liberate
(a) hydrogen gas
(b) carbon dioxide
(c) ammonia gas
(d) hydrogen sulphide gas
18. It is used to treat bee’s sting
(a) Mg(OH)2
(b) Ca(OH)2
(c) NaOH
(d) KOH
19. It is found in stings of bees and ants:
(a) lactic acid
(b) Maleic acid .
(c) butyric acid
(d) formic acid
20 It is used to cure sting of wasps:
(a) acetic acid
(b) benzoic acid.
(c) nitric acid
(d) sulphuric acid
21 Bases react with acid to form:
(a) salt only
(b) salt & water
(c) water only ;
(d) None of them
22 Stomach acidity is also called :
(a) acidity
(b) heart burning
(c) hyperacidity .
(d) hypoacidity\
23 When acids react with carbonates and bicarbonates, which evolves out:
(a) H2S .
(b) CO3 .
(c) CO2
(d) CO
24 It is used in etching designs on copper plates:
(a) sulphuric acid
(b) acetic acid
(c) hydrochloric acid
(d) nitric acid
25 These can act as lewis bases
(a) cations
(b) anions
(c) cations & anions
(d) radicals
26 Uric acid is present in
(a) fats
(b) citrus fruits
(c) apples
(d) urine
27 In etching process, the glass or mirror is dipped into:
(a) hydrochloric acid
(b) sulphuric acid
(c) nitric acid
(d) hydrofluoric acid
28 Concentration of _ __ in pure water is the basis for pH scale
(a) hydrogen ion.
(b) sodium ion
(c) potassium ion
(d) hydroxide ion
29 Water is:
(a) weak electrolyte
(b) strong electrolyte
(c) non-electrolyte
(d) None of them
30 Water ionizes slightly into ions is a process called:
(a) neutralization
(b) auto ionization
(c) self ionization
(d) both b & c
31 “Kw” is k own as:
(a) equilibrium constant
(b) ionic product constant
(c) specific rate constant
(d) all of them
32 The negative logarithm of molar concentration of hydrogen ions is:
(a) POH
(b) p
(c) pH
(d) None of them
33 The range of pH scale is from:
(a) 10-14
(b) 1-14
(c) 0-14
(d) 14-0
34 The sum of pH scale and pOH is always :
(a) 14 at 26°C
(b) 14 at 25°C
(c) 13 at 25 °C
(d) 7 at 25 °C
35 A solution of a compound of pH 7 or pOH 7 is considered a:
(a) basic solution
(b) neutral solution
(c) acidic solution
(d) None of them
36 Solution of pH less than are acidic.
(a) 7
(b) 14
(c) 6
(d) 9
37 Solution of pH more than 7 are:
(a) acidic
(b) neutral
(c) basic
(d) All of them
38 pH =_
(a) -log[OH]–
(b) – log [H]+
(c) log [H]+
(d) Both b&c
39 A solution of pH = 1 has times higher concentration of H* than a solution of pH = 2:
(a) 14 times
(b) 100 times .
(c) 10 times
(d) None of them
40 Low pH value means:
(a) strong acid
(b) weak acid
(c) strong basic
(d) All of them
41 pH of a neutral solution is always:
(a) 14
(b) 0
(c) 7
(d) None of them
42 High value of pH means:
(a) strong acid
(b) strong base
(c) Both a & b
(d) neutral
43 Indicators are:
(a) inorganic compounds.
(b) hydrocarbons
(c) organic compounds
(d) None of them
44 Indicators have_ colour in acidic or basic solution:
(a) same .
(b) different
(c) light
(d) normal
45 It is a common indicator.
(a) litmus
(b) pH meter
(c) pH scale
(d) both a & b
46 Litmus is _ in acidic solution:
(a) blue
(b) normal
(c) red
(d) orange
47 Litmus is |_in basic solution:
(a) red
(b) blue
(c) yellow
(d) orange
48 Phenolphthalein is _in acidic solution:
(a) red e.
(b) blue
(c) yellow
(d) colorless
49 Methyl orange is _ in alkaline solution :
(a) red
(b) blue
(C) yellow
(d) orange
50 At which pH methyl orange change color:
(a) 7
(b) 14
(c) 9
(d) 4
51 At which pH phenolphthalein change color:
(a) 7
(b) 4
(c) 9
(d) 0
52 pH meter consists of:
(a) pH electrode
(b) positive electrode
(c) negative electrode
(d) None of them
53 It is much more reliable and accurate method of measuring pH:
(a) universal indicator
(b) pH meter
(c) pH scale
(d) litmus
54 A solution HCl is 0.001 M. what is pH value?
(a) 3
(b) 12
(c) 2
(d) 14
55 What is pH value of 0.01 M solution of KOH?
(a) 14
(b) 13
(c) 11
(d) 3
56 What is pH value of 0.01 M sulphuric acid ?
(a) 7.1
(b) 1.7
(c) 1.0
(d) 0.3
57 Ionic product constant depends on :
(a) temperature .
(b) concentration
(c) both
(d) None
58 Salts are:
(a) organic compounds
(b) inorganic compounds
(c) ionic compounds
(d) None of them
59 A cation is derived from:
(a) acid
(b) base
(c) molecule
(d) compound
60 Metallic oxides are:
(a) bases
(b) acids
(c) salts
(d) organic compounds
61 A anion is derived from:
(a) acid
(b) base
(c) molecule
(d) all of them
62 When Na reacts with HCl the salt produced is:
(a) NaCl
(b) NaOH
(c) H2O
(d) NH3
63 Sodium carbonate, Sodium sulphate and sodium silicate are used to manufacture:
(a) paper
(b) detergents .
(c) glass
(d) cleaning agents
64 Heat resistance glass is:
(a) simple glass
(b) Pyrex
(c) both a and b
(d) None of them
65 Salts are found in:
(a) crystalline form
(b) amorphic form
(c) Both a & b.
(d) None
66 Salt have:
(a) high M.P and low B.P Tlm
(b) high M.P and B.P
(c) low M.P and low B.P
(d) low M.P and high B.P
67 Copper sulphate has water of crystallization:
(a) 5
(b) 2
(c) 6
(d) 24
68 Calcium sulphide has water of crystallization:
(a) 5
(b) 2
(c) 6
(d) 24
69 Salts may be:
(a) water soluble
(b) water insoluble
(c) both
(d) none
70 -_salts are often prepared in water:
(a) soluble
(b) insoluble
(c) both
(d) none
71 Reaction of acid and a metal is called reaction:
(a) partial displacement
(b) direct displacement
(c) incomplete displacement
(d) all of these
72 Mostly insoluble metallic oxides react with to form salt and water:
(a) dilute acids
(b) concentrated acids
(c) dilute bases
(d) None of them
73 In preparation of insoluble salts, _are mixed:
(a) insoluble salts
(b) soluble salts
(c) insoluble and soluble salts
(d) None
74 There are types of salts:
(a) 4
(b) 5
(c) 6
(d) 7
75 HCI + KOH →→KCI + H2O is an example of:
(a) neutral salt
(b) acidic salt
(c) basic salt
(d) complex salt
76 H3PO4 + NaOH NaH2PO4 + H2O is an example of :
(a) acidic salt
(b) basic salt
(c) double salt
(d) normal salt
77 Acidic salts turn __ litmus into red:
(a) blue .
(b) orange
(c) yellow
(d) green
78 FeSO4.(NH4)2 SO4.6H2O is:
(a) mohr’s salt
(b) potash alum
(c) ferric alum
(d) None
79 Double salts are formed by two:
(a) acidic salts
(b) neutral salts
(c) basic salts
(d) mixed salts
80 The formula of bleaching powder is:
(a) CacL
(b) Ca(OCI)CL
(c) CaCl2
(d) Ca(OCI)
81 Washing soda has water of crystallization:
(a) 24
(b) 6
(c) 5
(d) 10