Explanation

The number of friends and family members at the party was amazing.

پارٹی میں دوستوں اور فیملی ممبرز کی تعداد حیرت انگیز تھی۔

"We use 'was' here because 'the number' is a singular noun.

Even though 'friends and family members' is plural, it acts as a unit

In this context, so we treat it as singular when discussing the number itself."

Explanation

Explanation

Electric field intensity (E) is defined as force per unit charge: E = F/q.

So its unit is Newton/Coulomb (N/C).

Explanation

The given compound is an ionic compound

It is made up of:

• one potassium
• one manganese,
• four oxygen atoms.

Oxidation numbers of potassium (K) and oxygen (O) are +1 and -2 respectively.

Let us assume that the oxidation number of Mn is $x$.

Since ionic compounds are neutral, the net charge on them is zero.

(Oxidation number of K) + (Oxidation number of Mn) + (4 $\times$ The oxidation number of O) = $0$

(1)$\times$(K) + (1)$\times$(Mn) + 4$\times$(O) = $0$

$(1)$$\times$(+1) + (1)$\times$($x$) + 4$\times$(-2) = $0$

$x$ = +7

Hence, the oxidation number of $\text{Mn}$ in ${\text{KMnO}}_4$ is +7.

Explanation

Explanation

A calorimeter is an instrument used to measure the amount of heat absorbed or released during a chemical reaction or physical change.

It is essential for studying thermodynamic properties 

Explanation

Red blood cells (RBCs) are primarily responsible for transporting oxygen from the lungs to various tissues in the body.

They contain a protein called hemoglobin, which binds to oxygen molecules, facilitating their transport.

Explanation

Herbert Spencer (1820–1903) was an English philosopher who initiated a philosophy called 'Social Darwinism'.

He coined the term 'survival of the fittest' seven years before Darwin's publication of his theory of natural history.

The Origin of the Species in 1859.

Explanation

Real gases show deviation from ideal behavior at low temperature and high pressure.

Due to increased intermolecular forces and reduced volume available for gas molecules, which contradicts the assumptions of ideal gas behavior.

Explanation