Explanation

A rocket accelerates in space by expelling exhaust gases backward, which, according to Newton’s third law, produces an equal and opposite force pushing the rocket forward.

This force is called thrust and does not depend on external air or gravity.

Explanation

Flat bones are found in areas like the skull and ribs.

They providing protection and surface for muscle attachment.

They are thin and flattened compared to other bone types.

Explanation

Unsaturated Solution: A solution that can dissolve more solute at a given temperature.

Saturated Solution: A solution that contains the maximum amount of solute that can dissolve at a specific temperature.

Explanation

Indicators are colored organic compounds that change color depending on the pH of the solution.

Common examples include litmus, phenolphthalein, and methyl orange.

Explanation

In NH₄⁺, nitrogen has an oxidation state of –3 (typical for ammonia-like groups).

In NO₃⁻, nitrogen has an oxidation state of +5 due to its bonding with three oxygen atoms.

Explanation

Prussian blue is formed by a complex reaction involving Fe³⁺ (ferric) and [Fe(CN)₆]⁴⁻ (ferrocyanide) ions.

Both Ferric hexa cyano ferrate (II) and Iron (III) hexa cyano ferrate (II) describe the same compound responsible for the Prussian blue color.

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

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

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