Explanation

The aromatization of n-heptane primarily yields toluene.

This process involves the dehydrogenation and cyclization of n-heptane, facilitated by catalysts like Cr2O3/Al2O3 at elevated temperatures, forming a benzene ring with a methyl substituent.

Explanation

The dot product of a vector with itself is equal to the square of its magnitude, or |A|².

The dot product of two vectors A and B is defined as: A · B = |A| |B| cos θ, where θ is the angle between the vectors.

When a vector is dotted with itself, the angle θ becomes 0 (since the vectors are parallel), and cos 0 = 1.

Therefore, A · A = |A| |A| cos 0 = |A|². 

Explanation

A passive smoker inhales smoke from others' cigarettes.

It often in enclosed spaces.

It can lead to similar health risks as active smoking.

Explanation

The main reason for adding helium to the breathing mixture is to make the nitrogen-oxygen ratio lower than the air ratio so that the gas mixture can breathe safely in the deep sea. Lower levels of nitrogen are needed to reduce deep gas nitrogen anesthesia and other physiological effects.

Explanation

A population refers to all individuals of the same species living in a specific geographic area.

It is different from a community, which includes multiple species.

Explanation

The science of chemical characteristics falls under the heading of analytical chemistry.

Analytical chemistry focuses on the study of the composition and structure of matter, which includes identifying and characterizing its chemical properties.

Explanation

Soil pollution is primarily caused by acid rain.

Acid rain contains pollutants like sulfuric and nitric acids, which can degrade soil quality by altering its pH and harming plant life.

Explanation

Xerostomia is dryness in the mouth.

Xerostomia is also known as dry mouth.

Xerostomia means منہ میں لعاب دہن کا نہ ہونا یا کم ہونا

Explanation

Explanation

ہائیڈرو جن کا کیمیائی فارمولا H ہے۔

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RY 13-01-2023