Explanation

A polyprotic acid is an acid that can donate more than one proton (H⁺) per molecule.

1. H₃PO₄ (Phosphoric acid) → Triprotic acid (can donate 3 H⁺ ions)
2. HCN (Hydrocyanic acid) → Monoprotic (donates only 1 H⁺)
3. HCl (Hydrochloric acid) → Monoprotic

Explanation

Ferrum is the Latin name for iron, which is why its chemical symbol is Fe.

It is a transition metal used widely in construction.

It is essential in the human body for forming hemoglobin.

Explanation

"Very interesting" describes a noun by giving more information — this makes it an adjective phrase.

"Very" intensifies the adjective "interesting", forming a phrase that modifies nouns.

Explanation

A linear scale uses a line marked with distances to represent the scale on a map.

It helps measure actual distances directly by comparing with the marked segments on the line.

Explanation

To find the center of the circle, rewrite the equation in standard form:

45x² - 60x + 45y² + 36y = -19

Divide by 45:

x² - (4/3)x + y² + (4/5)y = -19/45

Complete the square:

(x - 2/3)² + (y + 2/5)² = ...

The center is (2/3, -2/5).

Explanation

Given the object's speed is 8 m/s after 1 second, we can determine the acceleration due to gravity on this planet is 8 m/s², since it starts from rest (0 m/s).

To find the speed after 3 seconds, we use the formula: speed = initial speed + acceleration × time

Initial speed = 0 m/s (since it's dropped)

Acceleration = 8 m/s²

Time = 3 seconds

Speed after 3 seconds = 0 + 8 × 3 = 24 m/s

Explanation

The Data Link layer is responsible for physical addressing through MAC (Media Access Control) addresses.

The Physical layer deals with transmitting raw bits over the medium.

Explanation

In ASCII code, the capital letter 'A' is represented by the binary 01000001.

Computers use this binary format to store and process text data.

Explanation

روزہ نفس کی تربیت اور پاکیزگی یعنی تزکیہ کا ذریعہ بنتا ہے۔

اس سے انسان میں صبر، تقویٰ اور خود احتسابی پیدا ہوتی ہے۔

Explanation

Hazrat Ruqayyah (RA) was the daughter of Prophet Muhammad (SAW).

She was married to Hazrat Usman (RA), earning him the title "Zun-Noorain" (the one with two lights) after later marrying another daughter, Umm Kulthum (RA), after Ruqayyah's death.