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

Some algae and photosynthetic bacteria can produce hydrogen using sunlight through biophotolysis.

They use enzymes like hydrogenase to convert water into hydrogen gas during photosynthesis.

Explanation

To find the common factors, let's list the factors of each number:

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

Factors of 45: 1, 3, 5, 9, 15, 45

Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54

The common factors are 1 and 3.

Explanation

"Theirs" shows ownership of the garden, making it a possessive pronoun.

It replaces a noun and indicates something belongs to "them."

Explanation

"This" and "that" are used to point to specific things, so they are demonstrative pronouns.

They indicate which object is being referred to in the sentence.

Explanation

مہتر ایک مذکر لفظ ہے، اور اس کا مؤنث "مہترانی" ہے۔

یہ پیشے کے لحاظ سے صفائی کرنے والے یا خاکروب کے لیے استعمال ہوتا ہے، اور مؤنث شکل عورت کے لیے ہے۔

Explanation

Education has been considered a human right since the Universal Declaration of Human Rights adopted by the United Nations in 1948.

Article 26 of the declaration specifically recognizes the right to education for all individuals.

Explanation

A teacher's polite and well-spoken behavior reflects their conduct, which involves professionalism, manners, and interpersonal behavior.

It shows how a teacher carries themselves ethically and respectfully in the classroom.

Explanation

Given:

x : y = 3 : 4

y : z = 6 : 7

To combine, equalize y in both ratios (LCM of 4 and 6 is 12):

x : y = 9 : 12

y : z = 12 : 14

Combine to get: x : y : z = 9 : 12 : 14

Explanation

The Paragraph group in MS Word includes options for bullets, numbering, and indentation, helping organize text clearly.

It also allows line spacing and alignment adjustments to improve document formatting.