4. Acids, Bases and Salts Multiple Choice Questions 1. The colour of methyl orange indicator in acidic medium is ____________ A) yellow B) green C) orange D) red
[ D ]
2. The colour of phenolphthalein indicator in basic solution is ____________ A) orange B) yellow C) Pink D) blue
[ B
]
3. The Colour of methyl orange in alkali conditions? A) orange B) yellow
[ B
]
C) red
4. A solution turns red litmus blue, its pH is likely to be ____________ A)1 B) 4 C) 5
D) blue [ D ] D) 10
5. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky the solution contains ____________ A)NaCl B) HCl C) LiCl D) KCl
[ B
]
[ B
]
7. Which of the following substances when mixed together will produce table salt? [ B A) Sodium thiosulphate and sulphur dioxide B) Hydrochloric acid and sodium hydroxide C) Chlorine and oxygen D) Nitric acid and sodium hydrogen carbonate
]
8. The aqueous solution of ______________ conducts electricity. A) Ethyl alcohol B) acetic acid C) acetone
]
6. N2 + O2 →2NO–Q in this reaction indicates ___________ A) Exothermic reaction B) Endothermic reaction C) Electro chemical reaction D) All of the above
[ B D) ether
9. Methyl orange are added to a soap solution. The colour of the solution becomes________ [ B ] A) Orange B) Yellow C) Pink D) Remains colourless. 10. What colour would hydrochloric acid (pH=1) turn universal indicator? A) orange B) purple C) yellow
[ D ] D) red
11. Which one of the following types of medicines is used for treating indigestion? [ C ] A) antibiotic B) analgesic C) antacid D) antiseptic 12. Which of the following is the most accurate way of showing neutralization? A) Acid + base→ acid-base solution B) Acid + base→ salt + water C) Acid + base →sodium chloride + hydrogen D) Acid + base→ neutral solution
[ B
]
13. Which of the following indicators is not an acid – base indicator? A) Phenolphthalein B) Vanilla C) Litmus
[ B D) Methyl orange
]
14. If a base dissolves in water by what name is it better known? A) neutralization B) basic C) acid
D) alkali
15. The acid formed in stomach which help in digestion is ________. C) CH3COOH A) HCl B) H2SO4
[ D ]
[ A ] D) citric acid
16. When red litmus paper is dippled in X solution then the litmus paper changes to blue colour. The nature solution X is ___________ [ C ] A) Salt B) Acid C) Base D) All of the above 17. The reaction between sodium sulphate and barium chloride gives barium sulphate. The colour of the product is ___________ A) Yellow B) White C) Brown D) Black
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
[ B
9440234404
]
11
Tenth Class
Bit Bank
Physical Science
18. Which of the following types of medicines is used for treating indigestion? [ C ] A) Anti biotic B) Analgesic C) Antacid D) Anti septic 19. Which of the following elements forms an acidic oxide? A) Mg B) Na C) P 20. At STP condition 2 grams of H2 Occupies _____________ volume. A) 112 lit B) 22.4 lit C) 24.2 lit
D) 211 lit
21. What is reason for whitening of wall when wet lime is applied A) Ca(OH)2 B) CaO C) CO2
D) CaCO3
22. Which of the following substances is used as an anti chloral? A) CaOCl2 B)Na2S2O3 C) Na2SO4
[ C ] D) Al [ B
]
[ A
]
[ B
]
[ D
]
D) CuSO4
23. An aqueous solution of sodium acetate will turn into ______________ A) Methyl orange yellow B) Red litmus blue C) Pheno phthalein solution pink D) all of these
24. Take yellow coloured Silver bromide in a watch glass and keep it in sunlight. Then the colour changes to ash colour. State the type of reaction? [ D ] A) Chemical combination B) Decompositon C) Displacement D) Double displacement 25. The colour of Precipitate formed when potassium lodide is reacted with Lead Nitrate. A) Yellow B) White C) Brown D) Black
[ A ]
26. In a chemical reaction the reactants changes their positive and negative radicals mutually. The reaction is called _______________ [ D ] A) Chemical combination B) Decompositon C) Displacement D) Double displacement 27. Which type of reaction occurred in crakers ______________ A) Neutralization B) Oxidation C) Reduction
[ B D) Mixed reaction
]
28. Swarna pushpam anklets changes its colour to black after some days. What is reason for the formation of the _______________________ [ C ] A) AgO B) Ag(OH)2 C) Ag2S D) AgCl 29. Many salts absorb water from atmosphere. This property is called ______________ [ A ] A) Crystallization B) Hydration C) Deliquescence D) Efflorescence 30. An Apple slice changes it colour to brown immediately after cutting. The reason is____ [ C ] A) Double displacement B) Reduction C) Oxidation D) Decomposition 31. Wet yellow flowers are placed in chlorine gas. Then they losses their colour. The reason is___ A) Cl2 B) O2 C) H2O D) HCl [ B ] 32. Stainless steel is mixture off______________ [ A ] A) Iron mixed with Carbon, Nickel and Chromium B) Silver mixed with Carbon, Iron, NIckel C) Copper mixed with Carbon, Chromium and Iron D) Iron mixed with Copper, Carbon and Chromium 33. Which gas is filled in the pocket for long time storage of chips? A) Oxygen B) Nitrogen C) Carbon Dioxide
[ B
]
D) Air
34. Which of the following indicators is not acid – base indicator? A) pheno phthalein B) Vanilla C) Litmus
[ B D) Methyl orange
]
35. Take X substance and heat it with a Bunsen burner. In this reaction they give brown colour gas. State the gas realeased from the following A) Nitrous oxide B) Nitric Oxide C) Nitrogen dioxide D) Nitrogen
[ C ]
36. What gas is produced when magnesium is made to react with hydrochloric acid? [ A ] A) hydrogen B) oxygen C) carbon dioxide D) no gas is produced Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
9440234404
12
Tenth Class
Bit Bank
Physical Science
37. The natural indicator among the following is _____________ A) Phenophthalein B) Methyl orange C) Methyl red
[ D ] D) Litmus.
38. If the pH of a solution is 13. This means that it is _____________ A) Strongly acidic B) Strongly basic C) Weakly acidic
[ B D) Weakly basic
39. A solution turns red litmus blue; its PH is likely to be____________ A) 1 B) 4 C) 5
D) 10
40. Water soluble bases are known as ___________________ A) Neutral B) base C) acid
D) alkali
[ D ]
[ D ]
41. H2O + ______________ → H3O+ A) H+ B) OH-
C) H2O
42. Which of the following has pH =O. A) Pure water C) 1M HCl solution in water
B) 1M CH3COOH solution in water D) 1M NaOH solution in water.
+
[ A ]
D) H3O
[
43. In neutralization reaction ______________is formed with water. A) acid B) base C) salt
]
C ]
[ C
]
D) ice.
44. A solution when added to crushed egg shells, a gas is evolved that turns lime water milky. The solution contains_______________ [ A ] A) HCl B) NH4Cl C) NaCl D) KCl 45. Which of the following substance has the lowest PH value? A) Sugar B) Tomato juice C) Vinegar
[ C ] D) Washing soda
46. Sodium hydrogen carbonate is an ingredient in_______________ A) Sugar B) Antacids. C) Vinegar
[ B ] D) Washing soda
47. Substances whose odour changes in acidic or basic are called ___________ [ C ] H A) p paper B) Synthetic indicators C) Olfactory indicators D) Litmus test 48. Bases which are soluble in water are called ______________ A) Alkalies B) Acidic C) Basic
[ C ] D) Neutral
49. The process of dissolving an acid or a base in water is an ______________ A) Exothermic process B) Endothermic process C) A and B
[ A ] D) None of these
50. Tooth decay starts when the pH of the mouth is lower than _____________ A) 5.2 B) 5.3 C) 5.4
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
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