Default Title

Question (11)

QN002741

Which statement correctly defines a compound?

(A) A substance formed by physical mixing only
(B) A substance made from one type of atom
(C) A substance formed when elements combine chemically in fixed ratio
(D) A substance that always remains liquid

Correct Answer: C

Explanation:

Compounds are formed by chemical combination in fixed ratios.

Link:

Report Error

Question (12)

QN002742

Which of the following is a compound?

(A) Iron
(B) Sulfur
(C) Oxygen
(D) Water

Correct Answer: D

Explanation:

Water is a compound of hydrogen and oxygen.

Link:

Report Error

Question (13)

QN002743

Which pair represents only non-metals?

(A) Iron and copper
(B) Oxygen and sulfur
(C) Gold and silver
(D) Aluminium and magnesium

Correct Answer: B

Explanation:

Oxygen and sulfur are non-metals.

Link:

Report Error

Question (14)

QN002744

Which of the following is classified as a metal?

(A) Carbon
(B) Hydrogen
(C) Iron
(D) Sulfur

Correct Answer: C

Explanation:

Iron is a metal.

Link:

Report Error

Question (15)

QN002745

Elements having properties intermediate between metals and non-metals are called

(A) alloys
(B) compounds
(C) metalloids
(D) mixtures

Correct Answer: C

Explanation:

Metalloids show mixed properties.

Link:

Report Error

Question (16)

QN002746

Which of the following is a metalloid?

(A) Silicon
(B) Oxygen
(C) Iron
(D) Gold

Correct Answer: A

Explanation:

Silicon is a metalloid.

Link:

Report Error

Question (17)

QN002747

The total number of known elements at present is

(A) 92
(B) 100
(C) 118
(D) 150

Correct Answer: C

Explanation:

Currently, 118 elements are known.

Link:

Report Error

Question (18)

QN002748

Which of the following exists as a liquid at room temperature?

(A) Sulfur
(B) Oxygen
(C) Mercury
(D) Carbon

Correct Answer: C

Explanation:

Mercury is a liquid metal at room temperature.

Link:

Report Error

Question (19)

QN002749

Which liquid element is a non-metal?

(A) Gallium
(B) Mercury
(C) Bromine
(D) Caesium

Correct Answer: C

Explanation:

Bromine is a liquid non-metal.

Link:

Report Error

Question (20)

QN002750

Gallium becomes liquid at approximately

(A) 0°C
(B) 10°C
(C) 30°C
(D) 100°C

Correct Answer: C

Explanation:

Gallium melts around 30°C.

Link:

Report Error

Question (11)

Which statement correctly defines a compound?

Explanation:

Link:

Question (12)

Which of the following is a compound?

Explanation:

Link:

Question (13)

Which pair represents only non-metals?

Explanation:

Link:

Question (14)

Which of the following is classified as a metal?

Explanation:

Link:

Question (15)

Elements having properties intermediate between metals and non-metals are called

Explanation:

Link:

Question (16)

Which of the following is a metalloid?

Explanation:

Link:

Question (17)

The total number of known elements at present is

Explanation:

Link:

Question (18)

Which of the following exists as a liquid at room temperature?

Explanation:

Link:

Question (19)

Which liquid element is a non-metal?

Explanation:

Link:

Question (20)

Gallium becomes liquid at approximately

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY