MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.
| 2051. |
Identify the two kinds of litmus paper. |
| A. | Blue and red |
| B. | Blue and yellow |
| C. | Red and green |
| D. | Yellow and red |
| Answer» B. Blue and yellow | |
| 2052. |
................ is present in grapes. |
| A. | Malic add |
| B. | Tartaric acid |
| C. | Acetic acid |
| D. | Citric acid |
| Answer» C. Acetic acid | |
| 2053. |
What do toothpastes contain? |
| A. | Strong acids |
| B. | Bases |
| C. | Acidic oxides |
| D. | Metals |
| Answer» C. Acidic oxides | |
| 2054. |
Lime water is a solution of: |
| A. | \[\text{Ca(OH}{{\text{)}}_{\text{2}}}\]in water |
| B. | \[\text{CaC}{{\text{l}}_{\text{2}}}\] in water |
| C. | \[\text{NaOH}\] in water |
| D. | \[\text{NaCl}\] in water |
| Answer» B. \[\text{CaC}{{\text{l}}_{\text{2}}}\] in water | |
| 2055. |
Match the following: Column A Column B (i) Oxalic acid [A] Curd (ii) Acetic acid [B] Tamarind (iii) Tartaric acid [C] Spinach (iv) Lactic acid [D] Vinegar |
| A. | (i - C), (ii - D), (iii - A), (iv - B) |
| B. | (i - D), (ii - A), (iii - B), (iv - C) |
| C. | (i - C), (ii - D), (iii - B), (iv - A) |
| D. | (i - D), (ii - C) (iii - B), (iv - A) |
| E. | None of these |
| Answer» D. (i - D), (ii - C) (iii - B), (iv - A) | |
| 2056. |
Which among the given acids is the strongest acid? |
| A. | Acetic acid |
| B. | Sulphuric acid |
| C. | Formic acid |
| D. | Tannic acid |
| Answer» C. Formic acid | |
| 2057. |
How does methyl orange indicator change its colour in the presence of acids? |
| A. | Yellow |
| B. | Green |
| C. | Red |
| D. | White |
| Answer» D. White | |
| 2058. |
Complete the following analogy: Turmeric: Indicator:: Milk of magnesia: |
| A. | Strong acid |
| B. | Antacid |
| C. | Antidote for sting |
| D. | Hydrated salt |
| Answer» C. Antidote for sting | |
| 2059. |
Neutral substances are: |
| A. | those substances which are slightly acidic or slightly basic in solution. |
| B. | those substances which do not change the colour of either red or blue litmus |
| C. | Both the above are correct |
| D. | None of the above is correct |
| Answer» C. Both the above are correct | |
| 2060. |
Which is the weakest acid among the following? |
| A. | Citric acid |
| B. | Sulphuric acid |
| C. | Hydrochloric acid |
| D. | Nitric acid |
| Answer» B. Sulphuric acid | |
| 2061. |
Which of the following does milk contain? |
| A. | Acid |
| B. | Base |
| C. | Salt |
| D. | All of the above |
| Answer» B. Base | |
| 2062. |
Which medicines are used for treating indigestion? |
| A. | Antibiotic |
| B. | Analgesic |
| C. | Antacids |
| D. | Antiseptic |
| Answer» D. Antiseptic | |
| 2063. |
Which of the following is not a base? |
| A. | Magnesium hydroxide |
| B. | Calcium hydroxide |
| C. | Calcium carbonate |
| D. | Sodium hydroxide |
| Answer» D. Sodium hydroxide | |
| 2064. |
Common name of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] is: |
| A. | oil of vitriol |
| B. | muriatic acid |
| C. | blue vitriol |
| D. | green vitriol |
| Answer» B. muriatic acid | |
| 2065. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 5 Consider the following substances and on that basis answer the following questions: Lemon juice, tomato juice, lime water, vinegar, sugar solution, solution of common salt. The number of neutral substances: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 2066. |
DIRECTION: Match Column-I with Column-II and select the correct answer using the codes given below the columns. Column - I Column - II (A) Malic acid (p) Window cleaner (B) Zinc carbonate (q) Milk (C) Ammonium hydroxide (r) Calamine (D) Lactice acid (s) Apple |
| A. | A\[\to \] (s), B\[\to \] (q), C\[\to \] (p), D\[\to \] (r) |
| B. | A\[\to \] (r), B\[\to \] (s), C\[\to \] (q), D\[\to \] (p) |
| C. | A\[\to \] (s), B\[\to \] (r), C\[\to \] (p), D\[\to \] (q) |
| D. | A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) |
| Answer» D. A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) | |
| 2067. |
Soluble bases are called: |
| A. | salts |
| B. | acids |
| C. | alkalies |
| D. | All the three |
| Answer» D. All the three | |
| 2068. |
A neutralization reaction |
| A. | includes an acid and a base |
| B. | produces a salt |
| C. | forms water |
| D. | All of the above |
| Answer» E. | |
| 2069. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Baking soda is a mild base that is used in toothpastes and mouthwashes to neutralize acids, which can produce unpleasant odours. (ii) An alkali is a water soluble acid. |
| A. | Statement (i) is correct while statement (ii) is incorrect |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Both statements are correct |
| D. | Both statements are incorrect. |
| Answer» B. Statement (ii) is correct while statement (i) is incorrect. | |
| 2070. |
The substances which form hydronium ions \[\left( {{\text{H}}_{\text{3}}}{{\text{O}}^{\text{+}}} \right)\] in water are called |
| A. | acids |
| B. | bases |
| C. | alkalies |
| D. | None of these |
| Answer» B. bases | |
| 2071. |
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Study the following chart and Identify 'A' and 'B'. A B |
| A. | Sodium hydroxide Sodium chloride |
| B. | Hydrochloric acid Sodium hydroxide |
| C. | Sodium hydroxide acid Aluminum hydroxide |
| D. | Hydrochloric acid Sodium chloride |
| Answer» C. Sodium hydroxide acid Aluminum hydroxide | |
| 2072. |
Study the given reaction. \[NaOH+HCl\to NaCl+{{H}_{2}}O\] Identify the salt in the above reaction. |
| A. | \[NaCl\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[HCl\] |
| D. | \[NaOH\] |
| Answer» B. \[{{H}_{2}}O\] | |
| 2073. |
DIRECTION: Match Column-I with Column-II and select the correct answer using the codes given below the columns. Column - I (Acid) Column-II (Natural Source of acid) (A) Acetic acid (p) Spinach (B) Citric acid (q) Tamarind (C) Tartaric acid (r) Orange (D) Oxalic acid (s) Vinegar |
| A. | A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) |
| B. | A\[\to \] (q), B\[\to \] (s), C\[\to \] (p), D\[\to \] (r) |
| C. | A\[\to \] (r), B\[\to \] (p), C\[\to \] (s), D\[\to \] (q) |
| D. | A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) |
| Answer» E. | |
| 2074. |
Acids are stored in glass container and not in metallic containers. Why? |
| A. | Glass containers are transparent |
| B. | Glass containers are cheaper |
| C. | Metal containers are not easily available. |
| D. | Metals react with acids if acids are stored in metallic containers. |
| Answer» E. | |
| 2075. |
In acids, methyl orange turns: |
| A. | yellow |
| B. | green |
| C. | red |
| D. | white |
| Answer» D. white | |
| 2076. |
DIRECTIONS: Match Column-I with Column-II and select the correct answer using the codes given below the columns. Column - I Column - II (A) Fertilizer (p) King of chemicals (B) Sulphuric acid (q) Basic (C) Lime water (r) Magnesium hydroxide (D) Milk of magnesia (s) Potassium nitrate |
| A. | (A) \[\to \] (s), (B) \[\to \] (p), (C) \[\to \] (q), (D) \[\to \] (r) |
| B. | (A) \[\to \] (q), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (r) |
| C. | (A) \[\to \] (r), (B) \[\to \] (p), (C) \[\to \] (s), (D) \[\to \] (q) |
| D. | (A) \[\to \] (s), (B) \[\to \] (r), (C) \[\to \] (q), (D) \[\to \] (p) |
| Answer» B. (A) \[\to \] (q), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (r) | |
| 2077. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Three different substances were taken and tested with litmus paper. The results are given below. Based on the results answer the questions 43 to 48. Type of Litmus X Y Z Red litmus turns blue no change no change Blue litmus no litmus turns red no change Which of the following could be the substance Z? |
| A. | \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] |
| B. | \[\text{HN}{{\text{O}}_{\text{3}}}\] |
| C. | \[\text{KOH}\] |
| D. | \[{{\text{H}}_{\text{2}}}\text{O}\] |
| Answer» E. | |
| 2078. |
.................. is the strongest add: |
| A. | Nitric add |
| B. | Malic add |
| C. | Formic add |
| D. | Lactic add |
| Answer» B. Malic add | |
| 2079. |
Match column I with column II and select the correct option from the codes given below. Column I (Salts) Column II (Uses) P. Baking soda 1. In making fire-works Q. Nitre 2. As a fungicide R. Blue vitriol 3. In purification of water S. Phitkari 4. In fire extinguishers |
| A. | P-3; Q-2; R-4; S-1 |
| B. | P-4; Q-3; R-1; S-2 |
| C. | P-4; Q-1; R-2; S-3 |
| D. | P-2; Q-1; R-4; S-3 |
| Answer» D. P-2; Q-1; R-4; S-3 | |
| 2080. |
Juice prepared from lemon is taken in a glass tumbler and water is added to it. Then a red litmus paper and a blue litmus paper were dipped into it. What changes were observed? |
| A. | Red litmus paper turns blue. |
| B. | Blue litmus paper turns red. |
| C. | Red litmus paper becomes white. |
| D. | Blue litmus paper becomes white. |
| Answer» C. Red litmus paper becomes white. | |
| 2081. |
From which of the following is the natural indicator litmus extracted? |
| A. | Mycorrhiza |
| B. | Lichens |
| C. | Mucor |
| D. | Mycelia |
| Answer» C. Mucor | |
| 2082. |
When few drops of phenolphthalein are added to sample 'A' it turned pink. To this pink coloured solution we added a few drops of sample 'B'. With continuous stirring the pink colour disappears. Samples 'A' and 'B' are: |
| A. | sample 'A' is acidic and sample 'B' is basic. |
| B. | sample 'A' is basic and sample 'B' is acidic. |
| C. | sample 'A' is basic and sample 'B' is neutral. |
| D. | sample 'A' is acidic and sample 'B' is neutral. |
| Answer» C. sample 'A' is basic and sample 'B' is neutral. | |
| 2083. |
Acid turns: |
| A. | blue litmus red |
| B. | red litmus blue |
| C. | blue litmus green |
| D. | red litmus yellow |
| Answer» B. red litmus blue | |
| 2084. |
............... changes odour in acidic and basic medium and is used as an olfactory indicator. |
| A. | Onion |
| B. | Vanilla |
| C. | Clove oil |
| D. | All of these |
| Answer» E. | |
| 2085. |
Which of the following substance present in turmeric changes its colour on reaction with base? |
| A. | Lichen |
| B. | Magnesia |
| C. | Curcumin |
| D. | None of these |
| Answer» D. None of these | |
| 2086. |
Raghav categorized the following household items into acids and bases. Acids Bases 1. Lemon 4. Baking soda 2. Antacid 5. Vinegar 5. Tea 6. Curd Which of them are placed under the wrong category? |
| A. | 3 and 5 |
| B. | 2 and 6 |
| C. | 3, 4 and 5 |
| D. | 2, 5 and 6 |
| Answer» E. | |
| 2087. |
The waste from a paper factory contains high amount of hydrochloric acid. How should we treat the waste, before disposal, to make it safe? |
| A. | Treat it with chemicals containing sodium hydroxide |
| B. | Treat it with chemicals containing sulphuric acid |
| C. | Treat it with chemicals containing sodium chloride |
| D. | Treat it with pure hydrochloric acid |
| Answer» B. Treat it with chemicals containing sulphuric acid | |
| 2088. |
When\[C{{O}_{2}}\]is passed through lime water, it turns milky. Identify the cause for the milkiness. |
| A. | Formation of \[CaC{{O}_{3}}\] |
| B. | Formation of \[Ca{{(OH)}_{2}}\] |
| C. | Formation of \[{{H}_{2}}O\] |
| D. | Formation of\[{{H}_{2}}\] |
| Answer» B. Formation of \[Ca{{(OH)}_{2}}\] | |
| 2089. |
............... is used to treat a soil that is acidic and min which plants do not grow well. |
| A. | Quicklime |
| B. | Slaked lime |
| C. | Calcium oxide |
| D. | Any one of (a), (b) or (c) |
| Answer» E. | |
| 2090. |
Salts are compounds: |
| A. | having a bitter taste |
| B. | having a sour taste |
| C. | obtained as a result of neutralization reaction between acid and base. |
| D. | All the above are correct |
| Answer» D. All the above are correct | |
| 2091. |
DIRECTIONS: The questions in this segment consists of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Sugar is a neutral substance. Reason (R): A sugar solution turns red litmus blue. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» D. A is false but R is true. | |
| 2092. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 3 Rahul and Manish went to a party Rahul ate too much fast food in the party and after returning home was complaining about the stomachache. Manish was worried about his condition. They went to doctor. Doctor told them not to get worried as this is due to indigestion of food and gave him some medicines. Indigestion is caused by presence of excess of ........................... in the stomach? |
| A. | food material |
| B. | hydrochloric acid |
| C. | baking soda |
| D. | milk of magnesia |
| Answer» C. baking soda | |
| 2093. |
Read the following statements: (i) It is a reaction between an acid and a base. (ii) Salt and water are produced in this reaction. (iii) It is an exothermic reaction. Which reaction is being referred to? |
| A. | Displacement reaction |
| B. | Neutralization reaction |
| C. | Redox reaction |
| D. | Decomposition reaction |
| Answer» C. Redox reaction | |
| 2094. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Alkalies are sour to taste. (ii) Mineral acids change to organic acids on addition of water. |
| A. | Statement (i) is correct while statement (ii) is incorrect |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Both statements are correct |
| D. | Both statements are incorrect. |
| Answer» E. | |
| 2095. |
A substance Y contains oxalic acid. What is Y? |
| A. | Vinegar |
| B. | Tamarind |
| C. | Soap |
| D. | Spinach |
| Answer» E. | |
| 2096. |
.................. is present in sour milk- |
| A. | Glycolic add |
| B. | Lactic acid |
| C. | Citrus add |
| D. | Tartaric acid |
| Answer» C. Citrus add | |
| 2097. |
Study the given table carefully. S. No. Samples Blue litmus to red Red litmus to blue (i) Tamarind juice \[\times \] (ii) Sugar syrup \[\times \] (iii) Lime water \[\times \] (iv) Soap solution \[\times \] Which of the above observations are correct? |
| A. | (i) and (iii) only |
| B. | (ii) and (iv) only |
| C. | (i), (ii) and (iii) only |
| D. | (i), (iii) and (iv) only |
| Answer» B. (ii) and (iv) only | |
| 2098. |
Which is not a property of an acid? |
| A. | All acids have sour taste. |
| B. | All acids turn blue litmus red. |
| C. | All acids turn red litmus blue. |
| D. | All the acids give neutralisation reaction. |
| Answer» D. All the acids give neutralisation reaction. | |
| 2099. |
Complete the following analogy: Sea water : Salty:: ______: Soap |
| A. | Bitter |
| B. | Slippery |
| C. | Sour |
| D. | Both (a) and (b) |
| Answer» E. | |
| 2100. |
Metallic oxides dissolve in water to form |
| A. | acidic solution |
| B. | neutral solution |
| C. | basic solution |
| D. | None of these |
| Answer» D. None of these | |