Explanation

Explanation

The chemical formula CH₃COOH represents acetic acid, a weak organic acid commonly found in vinegar.

Key Information:

Common Name: Acetic acid (systematic name: ethanoic acid).

Properties:

• Weak acid (partially dissociates in water).
• Pungent smell, sour taste (vinegar contains ~4–8% acetic acid).

Explanation

Ibn al Haytham is known as the Father of Optics.

His contributions to the field of optics through his monumental seven-volume work, Kitab al-Manazir (Book of Optics), compiled between 1011-1021 AD.

Explanation

To find the total number of handshakes, we use the combination formula since each member shakes hands with every other member exactly once before and after the meeting.

Number of members = 12

Handshakes before the meeting = 12C2 = (12 × 11) / 2 = 66

Handshakes after the meeting = 66

Total handshakes = 66 + 66 = 132

Explanation

To find the original price of the shirt, let's denote the original price as x. Since the price increased by 20%, the new price is 120% of the original price, or 1.2x.

Given that the new price is Rs. 480, we can set up the equation:

1.2x = 480

To solve for x, divide both sides by 1.2:

x = 480 / 1.2

x = 400

So, the original price of the shirt is 400.

Explanation

Let's break it down:

Akram travels 8 meters north.

Then, he takes a right turn (east) and travels 6 meters.

To find the distance from home, use the Pythagorean theorem:

√(8² + 6²) = √(64 + 36) = √100 = 10 meters

Explanation

Given:

1/4 (3 4/4 + 4 6/8 + 7 3/12)

Simplify each term:

3 4/4 = 3 + 1 = 4

4 6/8 = 4 + 3/4

7 3/12 = 7 + 1/4

Add the terms:

= 1/4 (4 + 4 + 3/4 + 7 + 1/4)

= 1/4 (15 + 3/4 + 1/4)

= 1/4 (15 + 1)

= 1/4 × 16

= 4

Explanation

The reporting verb "said" is in the past tense, so the verb in the reported speech must also change to past tense.

"Don't want" changes to "didn't want", and "you" becomes "me".

Correct: She said that she didn't want to come with me.

Explanation

2880 = 2⁶ × 3² × 5.

To make it a perfect square, we need to divide by 5 because it's the only prime factor with an odd exponent.

Explanation

Sodium chloride (NaCl), commonly known as table salt.

It is the main salt dissolved in seawater.