Neco Chemistry Past Questions and Answers

Question 36:

• NECO 2001

The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is ____________

A. 3
B. 9
C. 10
D. 18
E. 32

Question 37:

• NECO 2001

What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161

A. 1:01
B. 1:01
C. 2:01
D. 2:03
E. 3:01

Question 38:

• NECO 2001

How much sodium hydroxide is required to nka 250 cm3 ofa0.1 molar solution? Na=23; 0=16; H=1]

A. 10.0 g
B. 4.0g
C. 2.0 g
D. 1 .0g
E. 0.1 g

Question 39:

• NECO 2001

The oxidation number of X in \(XO_{4}^{3-}\) is

A. 1
B. -2
C. 3
D. 4
E. 5

Question 40:

• NECO 2001

The high boiling point of hydrogen fluoride can be explained in terms of ____________

A. Covalent bonds.
B. Dative bonds.
C. Dipole-dipole bonds.
D. Electrovalent (ionic) bonds
E. Hydrogen bonds.