Explanation

Vertical columns in the periodic table are called groups.

Horizontal rows are called periods.

Explanation

In HNO₃ (nitric acid):

Hydrogen (H) = +1

Oxygen (O) = -2 (×3 = -6)

Let nitrogen = x

So, +1 + x + (−6) = 0

⇒ x = +5

Nitrogen has an oxidation state of +5 in HNO₃.

Explanation

AGGRESSIVE means جارحانہ

Quarrelsome means جھگڑا

Violent means متشدد

Explanation

Neil Armstrong became the first human to step on the moon.

They did experiments on July 20, 1969.

He walked around for three hours.

Explanation

• The primary component of natural gas is methane (CH4).
• Making up 70% to 90% or more of its composition.
• It is a colorless, odorless, and highly flammable hydrocarbon gas.
• Characteristics: It is a fossil fuel, often found in rock formations alongside oil or on its own. 

Last updated question 15 March2026

Explanation

Sodium is a chemical element with the symbol Na and atomic number 11.

It is a soft, silvery-white, highly reactive metal.

Sodium is an alkali metal, being in group 1 of the periodic table.

Explanation

An imperative sentence gives a command, request, or instruction.

Example: Please close the door. or Sit down.

Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.

Explanation

The time period (T) of a simple pendulum is given by:

T ∝ √L

If the length (L) is made four times:

New time period T' ∝ √(4L)

T' ∝ 2√L

T' = 2T

The time period will become double.

Explanation

(+5) - (+7) = 5 - 7 = -2

Subtracting a larger positive number from a smaller one gives a negative result.