A mixture is different from a compound because

A. the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents

B. a mixture is always homogeneous while a compound is not

C. the constituent of a compound are chemically bound together while those of a mixture are not

D. a mixture can be represented by a chemical formula while a compound cannot

What is the percentage of sulphur in sulphur (IV) oxide?

A. 66%

B. 25%

C. 40%

D. 50%

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

A. 128

B. 8

C. 16

D. 64

200 cm³ of a gas at 25^oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm³ at 75^oC.

A. 342.53 mmHg

B. 1430.54 mmHg

C. 467.11 mmHg

D. 400.00 mmHg

An element X has electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵. Which of the following statements is correct about the element?

A. lt has a completely filled p-orbital

B. lt has 5 electrons in its outermost shell.

C. lt belongs to group ll on the periodic table

D. lt is a halogen

Beryllium and aluminium have similar properties because they

A. are both metals

B. belong to the same group

C. belong to the same period

D. are positioned diagonally to each other

If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is

A. metallic

B. covalent

C. co-ordinate

D. ionic

How many protons, neutrons and electrons respectively are present in the element 60/27 Co?

A. 27, 33 and 33

B. 33, 27 and 27

C. 27, 33, and 27

D. 60, 33 and 60

The radio active radiation used in studying the arrangement of particles in giant organic molecules is

A. \(\gamma\)- rays

B. \(\alpha\)- particles

C. X-rays

D. \(\beta\) - particles

A silicon -containing ore has 92% 28Si, 5% 29Si and 3% 30Si. Calculate the relative atomic mass of the silicon.

A. 14.00

B. 29.00

C. 28.11

D. 28.00