The Lanthanoids are part of which block of elements in the periodic table?

A. p-block
B. s-block
C. d-block
D. f-block

Answer

Correct Answer: D. f-block

Detailed About MCQs

Lanthanoids form part of the series of chemical elements comprising the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through the lutetium. They are a part of the f-block of elements in the periodic table.

Which of the following group of elements contain the noble gases?

A. s-block
B. p-block
C. d-block
D. f-block

Answer

Correct Answer: B. p-block

Detailed About MCQs

The p-Block Elements comprise those belonging to Group 13 to 18 and these together with the s-Block Elements are called the Representative Elements or Main Group Elements. The 18th group i.e. the last group of the p-block elements is the noble gas group.

What is Rose metal?

A. It is an alloy of Nickel, Tin, and Zinc
B. It is an alloy of Bismuth, Copper, and Palladium
C. It is an alloy of Palladium, Tin, and Lead
D. It is an alloy of Bismuth, Tin, and Lead

Answer

Correct Answer: D. It is an alloy of Bismuth, Tin, and Lead

Detailed About MCQs

Rose metal is an alloy of Bismuth, Tin, and Lead. It’s a fusible alloy with a low melting point commonly used for soldering.

Which chemical is also known as “Chinese snow”?

A. Silver iodide
B. Potassium nitrate
C. Ammonium chloride
D. Sodium phosphate

Answer

Correct Answer: B. Potassium nitrate

Detailed About MCQs

Potassium nitrate is one of several nitrogen-containing compounds collectively referred to as saltpeter. It is also known as “Chinese snow”. Major uses of potassium nitrate are in fertilizers, rocket propellants, and fireworks.

“Atoms can neither be created nor destroyed.” This principle was given by:

A. Avogadro
B. Dalton
C. Rutherford
D. Niels Bohr

Answer

Correct Answer: B. Dalton

Detailed About MCQs

The given principle is one of the postulates of Dalton’s atomic theory given in 1803 by John Dalton. The postulates of Dalton’s atomic theory are as follows:
1. Elements consist of indivisible small particles (atoms).
2. All atoms of the same element are identical; different elements have different types of atom.
3. Atoms can neither be created nor destroyed.