Explanation

HNO₃ is the chemical formula for Nitric acid, a strong mineral acid commonly used in fertilizers and explosives.

It contains one hydrogen, one nitrogen, and three oxygen atoms.

Explanation

In the sentence "What is she doing outside?", the word "outside" indicates where the action is taking place.

Therefore, it is an Adverb of Place.

The words like inside, outside, down, around are called: Adverb Of Place.

Explanation

"Bigger" is the comparative form of "big," used to compare two things.

The sentence compares two houses, so the comparative degree is appropriate.

Big: Positive Degree

Bigger: Comparative degree

Biggest: Superlative degree

Explanation

احد پہلے ہی ایک پہاڑ کا نام ہے، اس لیے "جبل احد کا پہاڑ" کہنا الفاظ کی تکرار ہے۔

درست اور جامع جملہ ہے: "میں نے احد کا پہاڑ دیکھا"۔

Explanation

The dissolving of salt in water is a physical change because:

Reversible Process: The salt can be recovered by evaporating the water (no new substance is formed).

Molecular Level: Salt (NaCl) dissociates into ions (Na⁺ and Cl⁻) but retains its chemical identity.

Explanation

Given A = [a b; b a] and A² = [l m; ...], let's calculate A²:

A² = [a b; b a] * [a b; b a]

= [a² + b² 2ab; 2ab a² + b²]

Comparing A² = [l m; ...] with our calculation:

l = a² + b²

m = 2ab

The correct answer is l = a² + b², m = 2ab.

Explanation

Let's simplify the expression:

log6 25 − 2 log6 5 + log6 a

Since 25 = 5^2:

log6 25 = log6 (5^2) = 2 log6 5

So, the expression becomes:

2 log6 5 - 2 log6 5 + log6 a

= log6 a

If this expression equals 0 (assuming that's the goal):

log6 a = 0

This implies:

a = 6^0

a = 1

Explanation

The words like on, over, at, under, by etc. are called Prepositions.

"Under" is a preposition showing the relationship between the cat and the table.

Prepositions indicate position, direction, or time in a sentence.

Explanation

The powers of i (the imaginary unit) repeat in a cycle of 4:

i¹ = i, i² = -1, i³ = -i, i⁴ = 1.

Since 10 ÷ 4 gives a remainder of 2, i¹⁰ = i² = -1.