DOWNLAOD THE ASSIGNMENT HERE:
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BIOLOGY TOPICS:
rDNA TECHNOLOGY:
https://www.sciencearena.in/2025/06/recombinant-dna-technology.html
EUGLENA:
https://www.sciencearena.in/2025/05/euglena.html
MONOCYSTIS:
https://www.sciencearena.in/2025/05/monocystis.html
PARAMECIUM:
https://www.sciencearena.in/2025/05/paramecium.html
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BIOLOGY (X) ACIDS, BASES AND SALTS |
|
MULTIPLE CHOICE QUESTIONS
(MCQs) |
|
1 |
Select from the following compounds which is not a base. (a) Sodium hydroxide (b) Calcium hydroxide (c) Sodium sulphate (d) Zinc oxide |
1 |
|
2 |
Select from the following compounds which is not a base. (a) Sodium hydroxide (b) Calcium hydroxide (c) Sodium sulphate (d) Zinc oxide |
1 |
|
3 |
Acid present in tomato is (a) methanoic acid (b) acetic acid (c) lactic acid (d) oxalic acid. |
1 |
|
4 |
A visually challenged student, has to perform a lab test to detect
the presence of acid in a given solution. The acid-base indicator preferred
by him will be (a) Blue litmus (b) Clove oil (c) Red cabbage extract (d) Hibiscus extract |
1 |
|
5 |
Select a pair of olfactory indicators from the following: (a) Clove oil and vanilla essence (b) Onion and turmeric (c) Clove oil and litmus paper (d) Vanilla and methyl orange |
1 |
|
6 |
Which one of the following natural sources contains Oxalic acid? (a) Tomato (b) Tamarind (c) Ant sting (d) Nettle sting |
1 |
|
7 |
Hydronium ions are formed by the reaction between (a) sodium hydroxide and water (b) calcium chloride and water (c) hydrogen chloride gas and water (d) ethanol and water |
1 |
|
8 |
A solution gives yellowish orange colour when a few drops of
universal indicator are added to it. This solution is of (a) lemon juice (c) sodium hydroxide (b) sodium chloride (d) milk of magnesia |
1 |
|
9 |
An aqueous solution of sodium chloride is prepared in distilled
water. The pH of this solution is (a) 6 (b) 8 (c) 7 (d) 3 |
1 |
|
10 |
Common salt is not a raw material for (a) bleaching powder (b) Plaster of Paris (c) baking soda (d) caustic soda. |
1 |
|
ASSERTION AND REASON QUESTIONS
(a) Both Assertion (A) and
Reason (R) are true and Reason (R) is the correct explanation of the
Assertion (A). (b) Both Assertion (A) and
Reason (R) are true and Reason (R) is not the correct explanation of the
Assertion (A). (c) Assertion (A) is true, and
Reason (R) is false. (d) Assertion (A) is false,
and Reason (R) True. |
|
11 |
Assertion (A): Sodium
hydrogen carbonate is used as an ingredient in antacids. Reason (R): NaHCO3
is a mild non-corrosive basic salt. |
1 |
|
12 |
Assertion (A): Fresh milk
in which baking soda is added, takes a longer time to set as curd. Reason (R): Baking soda
decreases the pH value of fresh milk to below 6. |
1 |
|
13 |
Assertion (A): pH of
ammonium nitrate solution is acidic. Reason (R): Solution of a salt
of weak base and strong acid is acidic. |
1 |
|
14 |
Assertion (A): Solutions
of glucose and alcohol do not conduct electricity. Reason (R): Substances
like alcohol and glucose though contain hydrogen but when dissolved in water
do not produce H+ ions. |
1 |
|
VERY SHORT ANSWER QUESTIONS |
|
15 |
Some metals react with acids to produce salt and hydrogen gas.
Illustrate it with an example. How will you test the presence of this gas? |
2 |
|
16 |
With the help of an example, explain what happens when a base reacts
with a non-metallic oxide. What do you infer about the nature of non-metal
oxide |
2 |
|
17 |
Explain how an antacid works |
2 |
|
18 |
Why is sodium hydrogen carbonate an alkaline salt? List its two
important uses. |
2 |
|
19 |
Sodium hydrogen carbonate is a basic salt". Justify this
statement. How is it converted into washing soda? |
2 |
|
SHORT ANSWER TYPE QUESTIONS |
|
20 |
Dil. HCI is added to Zn granules." How will you prove that
chemical change has taken place here? Support your response with two
arguments. |
3 |
|
21 |
A small amount of copper oxide was taken in a beaker and dilute
hydrochloric acid was added with continuous stirring of the solution. Name
the compound formed and state the colour of its solution. Write balanced
chemical equation for the reaction that occurs. Based on the reaction, state
the nature (acidic/basic) of copper oxide. á) What does pH scale measure? (b) Write its range. (c) State the significance of highest and lowest values of pH scale. |
3 |
|
22 |
Identify the acid and the base from which sodium chloride is
obtained. Which type of salt is it? When is it called rock salt? How is rock
salt formed? |
3 |
|
23 |
List the important products of the Chlor-alkali process. Write one
important use of each. |
3 |
|
24 |
How is washing soda prepared from sodium carbonate? Give its chemical
equation. State the type of this salt. Name the type of hardness of water
which can be removed by it. |
3 |
|
25 |
The pH a salt used to make tasty and crispy pakoras is 14. Identify
the salt and write a chemical equation for its formation. List its two uses. |
3 |
|
26 |
A white powder is added while baking cakes to make it soft and
spongy. Name its main ingredients. Explain the function of each ingredient. Write
the chemical reaction taking place when the powder is heated during
baking. |
3 |
|
LONG ANSWER TYPE QUESTIONS |
|
27 |
(a) Illustrate an activity to investigate whether all compounds
containing hydrogen are acidic. (b) What happens when hydrochloric acid and sodium hydroxide are
dissolved in water? Explain by giving equation of each. |
5 |
|
28 |
Define water of crystallisation. Give the chemical formula for two
compounds as examples. How can it be proved that the water of crystallisation
makes a difference in the state and colour of the compounds? |
5 |
|
29 |
What is water of crystallisation? Write the common name and chemical
formula of a commercially important compound which has ten water molecules as
water of crystallisation. How is this compound obtained? Write the chemical
equation also. List any two uses of this compound |
5 |
|
30 |
A chemical compound ‘X’ is used in the soap and glass industry. It is
prepared from brine. (a) Write the chemical name, common name and chemical formula of ‘X’. (b) Write the equation
involved in its preparation. (c) What happen when it is treated with water containing Ca or Mg
salt. |
5 |
|
31 |
(a) What are anhydrous and
hydrated salts? Explain with a suitable example of each. (b) How is plaster of paris prepared? What reaction take place when
it sets to a hard mass? |
5 |
|
32 |
What is water of crystallisation? Write the common name and chemical
formula of a commercially important compound which has ten water molecules as
water of crystallisation. How is this compound obtained. Write the chemical
equation also. List any two uses of this compound. |
5 |
|
33 |
How is sodium hydroxide produced? Write the balanced chemical
equation also. Why is this process called as chlor-alkali process? In this process
name of products given off at: (a) anode (b) cathode
Write one use of each of these products. |
5 |
|
CASE BASED STUDY QUESTIONS |
|
34 |
Read the passage and answer
the following questions: Ravi was cleaning his bathroom with a cleaner that contains
hydrochloric acid. Accidentally, a few drops fell on a blue-coloured tile,
and a reddish spot appeared. Curious, he added baking soda to the spot, and
it turned blue again. 1. What type of chemical reaction occurred when the red spot turned blue
again? 2. What does the colour change from blue to red indicate about the
nature of the cleaning solution? 3. Name the acid present in the cleaner. 4. Write the chemical reaction that occurred between baking soda and
the acid. 5. Why is it important to handle such cleaners with care? |
4 |
|
35 |
Read the passage and answer
the questions: Arjun fractured his hand and the doctor applied a white substance
that hardened quickly. The compound used was plaster of Paris. The doctor
warned him to avoid wetting it. 1. What is the chemical name and formula of plaster of Paris? 2. Why should water not be added in excess while using plaster of
Paris? 3. Write the reaction involved in the preparation of plaster of
Paris. 4. What happens when plaster of Paris is mixed with water? 5. Mention one use of plaster of Paris apart from making casts. |
4 |
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BIOLOGY TOPICS:
EUGLENA:
https://www.sciencearena.in/2025/05/euglena.html
MONOCYSTIS:
https://www.sciencearena.in/2025/05/monocystis.html
PARAMECIUM:
https://www.sciencearena.in/2025/05/paramecium.html
rDNA TECHNOLOGY:
https://www.sciencearena.in/2025/06/recombinant-dna-technology.html