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Science

CBSE · English · Class 10 · 14 questions with solutions

Q1MCQMEDIUM

Which acid is present in tomato?

A)

Oxalic Acid

✔
B)

Lactic Acid

C)

Acetic acid

D)

All of above

Q2QUESTION_GROUPMEDIUM

Riya was helping her mother in the kitchen. She noticed that when lemon juice was added to milk, the milk curdled. Her mother also told her that curd tastes sour while baking soda added to dough makes it fluffy. Curious, Riya took blue and red litmus paper strips and tested lemon juice, baking soda solution, and plain water. She observed that lemon juice turned blue litmus red, baking soda turned red litmus blue, and plain water changed neither. She also noticed that when baking soda was mixed with lemon juice, bubbles were produced. Her science teacher later explained that these are everyday examples of acids and bases interacting, and that the effervescence was due to carbon dioxide released in the reaction.

(a)

What does it indicate when lemon juice turns blue litmus paper red?

(b)

Why do bubbles form when baking soda is mixed with lemon juice?

(c)

Riya's teacher says that baking soda solution is basic. Explain with a balanced chemical equation what happens when baking soda reacts with hydrochloric acid, and why the reaction mixture becomes neutral.

Q3MCQMEDIUM

What is the color change of turmeric indicator when it is added to a basic solution?

A)

Yellow

B)

Red

✔
C)

Colourless

D)

Pink

Q4VSAMEDIUM

What is the formula of bleaching powder is _____________.

Q5VSAMEDIUM

Write the preparation of Washing soda.

Q6ASSERTION_REASONMEDIUM

Assertion (A):

While diluting an acid, water is never added to concentrated acid.

Reason (R):

The process of dissolving an acid in water is highly exothermic.

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
Q7MCQMEDIUM

What is the color of phenolphthalein in a basic solution?

A)

Yellow

B)

Colourless

C)

Pink

✔
D)

Red

Q8MCQMEDIUM

Which of the following substances turns blue litmus paper red?

A)

Acid

✔
B)

Base

C)

Salt

D)

Water

Q9ASSERTION_REASONMEDIUM

Assertion (A):

While diluting an acid, water is never added to concentrated acid.

Reason (R):

The process of dissolving an acid in water is highly exothermic.

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
Q10VSAMEDIUM

Write two uses of Washing Soda & Baking Soda?

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