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MCQOPTIONS
This section includes 95 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Study the table carefully Sample Blue litmus to red Red litmus to blue (i) Tamarind juice √ × (ii) Sugar syrup × √ (iii) Lime water × √ (iv) Soap solution √ × Which of the above are correctly matched? |
| A. | (i) & (iii) |
| B. | (ii) & (iv) |
| C. | To reach their breeding grounds |
| D. | (i), (iii) & (iv) |
| Answer» B. (ii) & (iv) | |
| 2. |
Manisha took a little bit of soil from her garden and mixed it with water. When she dipped a blue litmus in it, the litmus turned red- By adding which of the following to her garden will she get better plant growth? |
| A. | Hydrochloric acid |
| B. | Slaked lime |
| C. | Nocturnal |
| D. | Salt |
| Answer» C. Nocturnal | |
| 3. |
Many salts absorb water (moisture) from the atmosphere. This property is called |
| A. | hydration |
| B. | dehydration |
| C. | Only (i) and (iv) |
| D. | decantation |
| Answer» B. dehydration | |
| 4. |
Read the given passage and fill in the blanks by choosing an appropriate option.Bleaching powder is a ___i___ powder. When exposed to air, it reacts with ___ii___ of the air to liberate \[C{{l}_{2}}\]gas. It is ___iii___ in cold water and milkiness of the solution is due to presence of unreacted ___iv___. It reacts with HCI and \[{{H}_{2}}S{{O}_{4}}\]liberating ___v___ gas. |
| A. | (i)(ii)(iii)(iv)(v)Blue crystallineMoistureSoluble\[C{{O}_{2}}\]\[S{{O}_{2}}\] |
| B. | (i)(ii)(iii)(iv)(v)Yellowish white\[C{{O}_{2}}\]SolubleLime\[C{{l}_{2}}\] |
| C. | (i) and (iii) |
| D. | (i)(ii)(iii)(iv)(v)YellowMoistureSoluble\[C{{O}_{2}}\]\[C{{l}_{2}}\] |
| Answer» C. (i) and (iii) | |
| 5. |
You are provided with two solutions 'X' and 'Y?. The colour of turmeric stains on your clothes on coming in contact with solution 'X' changes to brick red and when in contact with solution 'Y' changes to yellow. The solution 'X' and 'Y' provided to you are respectively: |
| A. | Soap solution and lemon juice |
| B. | Lemon juice and soap solution |
| C. | Only (ii) and (iii) |
| D. | Soap solution and sugar solution |
| Answer» B. Lemon juice and soap solution | |
| 6. |
You dissolved a sample, in distilled water and then added a drop of this solution to a test-tube containing blue litmus solution which changes to red. It shows that the sample given to you is of: |
| A. | soap |
| B. | tomato juice |
| C. | Wading limbs to swim and wade |
| D. | sugar |
| Answer» C. Wading limbs to swim and wade | |
| 7. |
Which of the following is an antacid? |
| A. | \[Mg{{(OH)}_{2}}\] |
| B. | \[NaOH\] |
| C. | This thin layer of air that surrounds ear this no importance for living beings. |
| D. | \[{{H}_{2}}O\] |
| Answer» B. \[NaOH\] | |
| 8. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) All salts are neutral in nature. (ii) A solution of sodium chloride salt in water does not change the colour of any litmus paper. |
| A. | Statement (i) is correct while statement (ii) is incorrect |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Statement (i) is true but statement is false. |
| D. | Both statements are incorrect. |
| Answer» C. Statement (i) is true but statement is false. | |
| 9. |
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): Toothpaste neutralised the acid produced by fermentation of food particles in mouth. Reason (R): Toothpaste is alkaline in nature. |
| 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. | Winnowing |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 10. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 4 Indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, China rose petals (Gudhal), etc., are some naturally occurring indicators. Which of the following statements is correct? |
| A. | Colour of litmus changes from blue to red in an acidic solution. |
| B. | Colour of litmus changes from red to blue in an acidic solution. |
| C. | A is true but R is false. |
| D. | Colour of litmus changes from colourless to pink in a basic solution. |
| Answer» B. Colour of litmus changes from red to blue in an acidic solution. | |
| 11. |
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. Which of the following acid present in our stomach helps in digestion? |
| A. | Acetic acid |
| B. | Oxalic acid |
| C. | it is the property of all transparent substances. |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
Sodium bicarbonate is commonly called |
| A. | Lime water |
| B. | Slaked lime |
| C. | Water is present in air in liquid form |
| D. | Baking soda |
| Answer» E. | |
| 13. |
Sumedha took a spoon of turmeric powder and made a paste by adding little water to it. She cut thin strips of a paper and applied this paste on them. After drying she put few drops of given sample solutions (i)-(iv) on these strips. What would be the changes in the colour she observed? (i) Amia Juice (ii) Lime water (iii) Common salt solution (iv) Baking soda solution |
| A. | (i) (ii) (iii) (iv) Yellow Red Yellow Red |
| B. | (i) (ii) (iii) (iv) Red Yellow Yellow Red |
| C. | \[A\to (p);B\to (q);C\to (s);D\to (r)\] |
| D. | (i) (ii) (iii) (iv) Yellow Yellow Red Red |
| Answer» B. (i) (ii) (iii) (iv) Red Yellow Yellow Red | |
| 14. |
According to Bronsted concept, water is a |
| A. | Base |
| B. | Acid |
| C. | By removing all the air through a vacuum pump |
| D. | Salt |
| Answer» D. Salt | |
| 15. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage ? 2 The reaction between an acid and a base is known as neutralization reaction. In this reaction salt and water are produced with evolution of heat. Salt is a product formed as a result of neutralization reaction. Name the salt formed by reaction of sodium hydroxide and hydrochloric acid. |
| A. | sodium carbonate |
| B. | sodium bicarbonate |
| C. | water itself converts into bubbles. |
| D. | sodium sulphate |
| Answer» D. sodium sulphate | |
| 16. |
DIRECTION: Match Column-I with Column-II and select the correct answer using the codes given below the columns. Column - I Column - II (A) Sting of an ant (p) Litmus (B) Alkali (q) Soluble base (C) Indicator (r) Calamine (D) Bitter (s) Formic acid |
| A. | A\[\to \] (s), B\[\to \] (p), C\[\to \] (q), D\[\to \] (r) |
| B. | A\[\to \] (s), B\[\to \] (q), C\[\to \] (r), D\[\to \] (p) |
| C. | Reducing the number of vehicles |
| D. | A\[\to \] (r), B\[\to \] (q), C\[\to \] (p), D\[\to \] (s) |
| Answer» D. A\[\to \] (r), B\[\to \] (q), C\[\to \] (p), D\[\to \] (s) | |
| 17. |
What do antacids contain? |
| A. | A weak acid |
| B. | A weak base |
| C. | Air is homogeneous. |
| D. | A strong base |
| Answer» C. Air is homogeneous. | |
| 18. |
Rain becomes acidic: |
| A. | because excess of carbon dioxide present in air get dissolved in rain drops to form carbonic acid. |
| B. | oxides of nitrogen and sulphur present in air dissolve to form respective acids. |
| C. | Weather cock is used to find the direction in which air is moving at a particular place. |
| D. | None of these is correct |
| Answer» C. Weather cock is used to find the direction in which air is moving at a particular place. | |
| 19. |
A pH scale is given below. Which of the following mixtures can produce a neutral solution? |
| A. | P and Q |
| B. | P and R |
| C. | Both the above are correct |
| D. | All of these |
| Answer» C. Both the above are correct | |
| 20. |
Sodium Chloride will turn: |
| A. | Turmeric brownish-red |
| B. | China rose green |
| C. | nitrogen. |
| D. | All the above |
| E. | None of these |
| Answer» F. | |
| 21. |
Which of the following is a basic salt? |
| A. | \[NaHC{{O}_{3}}\] |
| B. | \[N{{H}_{4}}Cl\] |
| C. | Carbon dioxide |
| D. | All the above |
| E. | None of these |
| Answer» B. \[N{{H}_{4}}Cl\] | |
| 22. |
Which of the following are corrosive and can burn the skin? (i) Copper hydroxide (ii) Ammonium hydroxide (iii) Sodium hydroxide (iv) Potassium hydroxide |
| A. | (ii) and (ii) |
| B. | (iii) and (iv) |
| C. | Mosquito |
| D. | (i) and (iv) |
| E. | None of these |
| Answer» C. Mosquito | |
| 23. |
What are the solutions which do not change the colour of either red or blue litmus called? |
| A. | Acidic |
| B. | Basic |
| C. | It has moist skin. |
| D. | Alcohol |
| Answer» D. Alcohol | |
| 24. |
Choose the incorrect statement about acid. (i) Acids have a sour taste. (ii) Acids turn blue litmus red. (iii) Acids have a soapy feel. (iv) Acids are non-corrosive in nature. |
| A. | (i) and (iv) |
| B. | (ii) and (iii) |
| C. | It lives only on land. |
| D. | (iii) and (iv) |
| E. | None of these |
| Answer» E. None of these | |
| 25. |
An element X reacts with oxygen to form Y which turns red litmus to blue then, which of the following is correct? |
| A. | X is a metal and Y is acidic oxide. |
| B. | X is a non-metal and Y is basic oxide. |
| C. | insectivores. |
| D. | X is a non-metal and Y is acidic oxide. |
| E. | None of these |
| Answer» D. X is a non-metal and Y is acidic oxide. | |
| 26. |
A synthetic indicator used to test an acid or base is: |
| A. | China rose |
| B. | Methyl orange |
| C. | (i), (ii) & (iii) |
| D. | Litmus |
| E. | None of these |
| Answer» C. (i), (ii) & (iii) | |
| 27. |
Disposal of factory wastes in water bodies has been found to be harmful to water plants and animals. To prevent this the factory owner should: |
| A. | neutralize waste before disposal |
| B. | make the waste acidic before disposal |
| C. | Water |
| D. | All of the above are correct |
| Answer» B. make the waste acidic before disposal | |
| 28. |
Chemically, which of the following is baking soda? |
| A. | \[Ca{{(OH)}_{2}}\] |
| B. | \[NaHC{{O}_{3}}\] |
| C. | crystallization |
| D. | \[CaO\] |
| Answer» C. crystallization | |
| 29. |
Which of the following is a mineral acid? |
| A. | Oxalic acid |
| B. | Formic acid |
| C. | (i)(ii)(iii)(iv)(v)White\[{{O}_{2}}\]InsolubleLime\[C{{l}_{2}}\] |
| D. | Ascorbic acid |
| E. | None of these |
| Answer» D. Ascorbic acid | |
| 30. |
Which of the following is a neutral substance? |
| A. | Distilled water |
| B. | Common salt |
| C. | Lemon juice and vinegar |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 31. |
When Vedika washed a stain of vegetable curry on her suit with a cloth washing bar then it turned brownish-red, then it shows that the: |
| A. | Stain was of turmeric and the cloth washing bar was basic. |
| B. | Stain was of turmeric and the cloth washing bar was acidic. |
| C. | baking soda |
| D. | Stain was of yellow paint and the cloth washing bar was acidic. |
| E. | None of these |
| Answer» B. Stain was of turmeric and the cloth washing bar was acidic. | |
| 32. |
Bases: |
| A. | have slippery feel |
| B. | tastes sour |
| C. | \[{{H}_{2}}S{{O}_{4}}\] |
| D. | All these are correct |
| Answer» B. tastes sour | |
| 33. |
Observe the given figure carefully, which represents the decomposition of brine solution by passing electricity. |
| A. | XYPQRAt anodeAt cathode\[{{H}_{2}}\] gas\[C{{O}_{2}}\] gas\[N{{a}_{2}}C{{O}_{3}}\] |
| B. | XYPQRAt anodeAt cathode\[N{{H}_{3}}\] gas\[{{H}_{2}}\] gas\[N{{H}_{4}}Cl\] |
| C. | Both statements are correct |
| D. | XYPQRAt cathodeAt anode\[{{H}_{2}}\] gas\[C{{l}_{2}}\] gas\[NaOH\] |
| Answer» E. | |
| 34. |
Consider the following statements (I-IV) and fill in the blanks by choosing the appropriate option.I. An antacid such as ___P___ is used to cure indigestion.II. Lime water contains ___Q___, which turns milky with carbon dioxide.III. Soap solution is basic due to presence of ___R___. It turns turmeric stain of shirt to red.IV. Baking soda is ___S___ which reacts with vinegar to evolve carbon dioxide gas. |
| A. | PQRS Milk of magnesia Calciumhydroxide Sodium hydroxide Sodium hydrogen carbonate |
| B. | PQRS Calcium hydroxideMilk of magnesia Sodium hydroxide Sodium hydrogen carbonate |
| C. | A is true but R is false. |
| D. | PQRS Sodiumhydrogen carbonate Calcium hydroxideMilk of magnesia Sodium hydroxide |
| Answer» B. PQRS Calcium hydroxideMilk of magnesia Sodium hydroxide Sodium hydrogen carbonate | |
| 35. |
Ammonia gas dissolve in water to give\[N{{H}_{4}}OH\]In this reaction water acts as |
| A. | An acid |
| B. | A salt |
| C. | Colour of litmus changes from pink to colourless in an acidic solution. |
| D. | Amphoteric |
| Answer» B. A salt | |
| 36. |
Which acid is present in vinegar? |
| A. | Formic acid |
| B. | Acetic acid |
| C. | Hydrochloric acid |
| D. | Malic acid |
| Answer» C. Hydrochloric acid | |
| 37. |
What is the effect of the soap solution on phenolphthalein? |
| A. | It turns pink. |
| B. | It remains colourless. |
| C. | Washing soda |
| D. | It turns red. |
| Answer» B. It remains colourless. | |
| 38. |
Study the given Venn diagram carefully. Identify 1, 2 and 3. |
| A. | 123Do not react with metalsReact with litmusDo not react with carbonates |
| B. | 123Are sour in tasteReact with carbonates Are soapy to touch |
| C. | (i) (ii) (iii) (iv) Red Red Yellow Yellow |
| D. | 123React with carbonates to form \[C{{O}_{2}}\] gasCan be identified by using indicators Turn China roseindicator green |
| Answer» E. | |
| 39. |
Which of the following can act both as a Bronsted acid and a Bronsted base? |
| A. | \[{{O}^{-2}}\] |
| B. | \[HCl\] |
| C. | Both acid and base |
| D. | \[N{{a}_{2}}C{{O}_{3}}\] |
| Answer» C. Both acid and base | |
| 40. |
Which of the following is acidic in nature? |
| A. | Apple juice |
| B. | Soap solution |
| C. | sodium chloride |
| D. | None of these |
| Answer» B. Soap solution | |
| 41. |
Strong acid among the following is: |
| A. | Magnesium hydroxide |
| B. | Sodium hydrogencarbonate |
| C. | A\[\to \] (s), B\[\to \] (q), C\[\to \] (p), D\[\to \] (r) |
| D. | Sodium hydroxide |
| E. | None of these |
| Answer» F. | |
| 42. |
Sodium hydroxide combines with hydrochloric acid to form: |
| A. | Sodium hydrogencarbonate |
| B. | Sodium chloride |
| C. | A strong acid |
| D. | Water only |
| E. | None of these |
| Answer» C. A strong acid | |
| 43. |
To make the soil fertile what a farmer should add to the soil? |
| A. | Slaked lime |
| B. | Quick lime |
| C. | Both the above are correct |
| D. | Manure |
| E. | None of these |
| Answer» E. None of these | |
| 44. |
Rahul took a turmeric paper and tried to draw flowers on it with the help of cotton buds dipped in solutions P and O. The flower drawn with solution P was not visible while one drawn with solution Q turned red.Solutions P and Q could be respectively |
| A. | Lime water and lemon juice |
| B. | Vinegar and soap solution |
| C. | R and S |
| D. | Both (B) and (C). |
| Answer» E. | |
| 45. |
Antacids contain: |
| A. | weak base |
| B. | weak acid |
| C. | Litmus blue to red |
| D. | strong acid |
| Answer» B. weak acid | |
| 46. |
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In an experiment about 10 ml of sodium hydroxide solution was taken in a beaker 'A'. To it was added a few drops of red litmus solution which turned blue. This solution was then taken in beaker 'B' and vinegar was added to it drop by drop with continuous stirring. It was observed that the colour of solution in beaker 'B' has changed to red. This experiment shows: |
| A. | Saponification |
| B. | Acidification |
| C. | \[N{{a}_{2}}S{{O}_{4}}\] |
| D. | Both (b) and (c) |
| Answer» E. | |
| 47. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled 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): Neutralization reaction is accompanied by evolution of heat. Reason (R): Neutralization reaction is a reaction between an acid and a base to form salt and water. |
| 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. | (ii) and (iii) |
| D. | A is false but R is true. |
| Answer» C. (ii) and (iii) | |
| 48. |
Baking powder is a mixture of X and a mild edible acid such as Y. When it is heated, Z is produced which makes bread and cake soft and spongy. X, Y and Z are respectively |
| A. | Sodium hydrogen carbonate, tartaric acid, \[C{{O}_{2}}\] |
| B. | Sodium carbonate, acetic add, \[C{{O}_{2}}\] |
| C. | Lime water is a solution of calcium hydroxide. |
| D. | Sodium chloride, oxalic acid, \[{{H}_{2}}\] |
| Answer» B. Sodium carbonate, acetic add, \[C{{O}_{2}}\] | |
| 49. |
Which of the following processes represents a neutralisation reaction? |
| A. | Applying vinegar on wasp sting |
| B. | Brushing our teeth with toothpaste |
| C. | Neutral |
| D. | All of these |
| Answer» E. | |
| 50. |
How does methyl orange indicator change its colour in the presence of bases? |
| A. | Green |
| B. | Black |
| C. | (i) and (ii) |
| D. | Yellow |
| Answer» E. | |