Free NSAA Chemistry Questions and Answers

Question 1

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Answer

Hydrogen

Answer

Oxygen

Answer

Chlorine

Question 2

What is the molecular geometry of methane (CH₄)?

Accepted Answer

Tetrahedral

Answer

Linear

Answer

Bent

Answer

Trigonal planar

Question 3

Which of the following compounds is ionic?

Accepted Answer

NaCl

Answer

CO₂

Answer

H₂O

Answer

CH₄

Question 4

What type of reaction is represented by the following equation: 2H₂ + O₂ → 2H₂O?

Accepted Answer

Synthesis

Answer

Decomposition

Answer

Single displacement

Answer

Double displacement

Question 5

Which of the following statements about catalysts is true?

Accepted Answer

Catalysts speed up the reaction without being consumed.

Answer

Catalysts are consumed in the reaction.

Answer

Catalysts increase the activation energy of a reaction.

Answer

Catalysts are only effective at high temperatures.

Question 6

What is the pH of a 0.01 M solution of HCl?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 7

Which of the following is the correct electron configuration for a neutral atom of sulfur (atomic number 16)?

Accepted Answer

1s² 2s² 2p⁶ 3s² 3p⁴

Answer

1s² 2s² 2p⁶ 3s² 3p³

Answer

1s² 2s² 2p⁶ 3s¹ 3p⁵

Answer

1s² 2s² 2p⁶ 3s² 3p⁶

Question 8

In the periodic table, which trend is observed as you move from left to right across a period?

Accepted Answer

Metallic character decreases

Answer

Atomic radius increases

Answer

Ionization energy decreases

Answer

Electronegativity decreases

Question 9

Which of the following compounds will exhibit hydrogen bonding?

Accepted Answer

NH₃

Answer

CH₄

Answer

H₂S

Answer

CO₂

Question 10

What is the oxidation state of manganese in KMnO₄?

Accepted Answer

7

Answer

2

Answer

4

Answer

5