Explanation

RNA contains Uracil instead of Thymine, which is found in DNA.

The four bases in RNA are Adenine (A), Uracil (U), Guanine (G), and Cytosine (C).

Explanation

Naming words are nouns — names of people, animals, places, or things.

Pen, car, rabbit are all nouns, making them the correct group of naming words.

Explanation

"Reign" means the rule or period of power of a king or queen — matches the meaning of the sentence.

It is the correct homophone (same sound, different meaning/spelling) for this royal context.

Explanation

When zinc reacts with dilute sulfuric acid, it forms zinc sulfate (ZnSO₄) and releases hydrogen gas (H₂).

The reaction is:

Zn + H₂SO₄ → ZnSO₄ + H₂↑

Explanation

Helium belongs to the Noble gases family, which includes stable, non-reactive gases like neon and argon.

It is the second most abundant element in the universe after hydrogen.

Explanation

Sand particles are generally grey in color, though they can vary depending on their mineral content.

They are light in weight and have larger, coarse grains compared to silt or clay.

Explanation

Tincture of iodine is iodine dissolved in alcohol (usually ethanol).

Alcohol acts as a solvent and helps iodine work as an antiseptic.

Explanation

Find the least common multiple (LCM) of 10, 11, and 17.

The LCM of 10, 11, and 17 is the smallest number that is a multiple of all three numbers.

Calculate the LCM.

The prime factorization of the numbers is:

10 = 2 × 5

11 = 11

17 = 17

The LCM is the product of the highest powers of all prime factors: LCM = 2 × 5 × 11 × 17 = 1870.

Explanation

She said, "We are going to the park."

Inverted commas (quotation marks) should enclose the spoken words, and the full stop should come inside the closing quotation mark.

Explanation

A function f: A → B is into if it doesn't cover the entire codomain B, meaning there are elements in B that aren't mapped to by any element in A. 

This happens when the range of f (the set of elements in B that are actually mapped to) is a proper subset of B.

Therefore, f is into if Range f ≠ B.