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JAMB UTME - Chemistry - 2013

Question 1 Report

Which of the following substances is not a salt?

Aluminium oxide

Sodium hydrogentrioxosulphate (V)

Sodium trioxocarbonate (V)

Zinc chloride

Answer Details

The substance that is not a salt among the options given is Aluminium oxide. A salt is a type of chemical compound that is formed when an acid reacts with a base. It is typically made up of a metal cation and a non-metal anion. Sodium hydrogentrioxosulphate (V), sodium trioxocarbonate (V), and zinc chloride are all examples of salts. Aluminium oxide, on the other hand, is not formed from the reaction of an acid and a base. It is an oxide of the metal aluminium and is therefore not a salt. In summary, of the substances listed, Aluminium oxide is not a salt, while sodium hydrogentrioxosulphate (V), sodium trioxocarbonate (V), and zinc chloride are all examples of salts.

Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)

Acids, Bases And Salts (Ghana Only)

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Question 7 Report

10.0 dm3 of water was added to 2.0 mol dm-3 of 2.5dm3 solution of HCl. What is the concentration of the final solution in mol dm-3?

0.4

8.0

2.0

0.5

Answer Details

C1V1 = C2V2

C2 = $\frac{C_{1} V_{1}}{V_{2}}$

= $\frac{2.0 \times 2.5}{12.5}$

= 0.4mol/dm-3

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

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Question 32 Report

The rate of diffusion of a gas Y is twice that of Z If the relative molecular mass of Y is 64 and the two gases diffuse under the same conditions, find the relative molecular mass of Z

32

4

8

16

Answer Details

\sqrt{y}

= 2x

\sqrt{Z}

= x

\frac{r z}{r y}

=

\sqrt{\frac{m y}{m z}}

$\frac{2 x}{x}$ = $\sqrt{\frac{64}{m z}}$
$\frac{4}{1}$ = $\frac{64}{m z}$

mz = $\frac{64}{4}$
mz = 16

Read lesson note on Kinetic Theory Of Matter And Gas Laws (JAMB)

Kinetic Theory Of Matter And Gas Laws

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Question 42 Report

The radioactive emission with the least ionization power is

α−particles

X-rays

γ - r a y s

β−rays

Answer Details

The radioactive emission with the least ionization power is gamma (γ) radiation. Gamma radiation is a type of electromagnetic radiation that has the highest frequency and shortest wavelength among all types of radiation. While it is highly penetrating and can cause damage to biological tissues, it has the least ionization power because it carries no electric charge and does not interact strongly with matter. This means that gamma radiation can easily pass through materials without being deflected or slowed down, and it takes a lot of energy to ionize atoms or molecules through gamma radiation. In comparison, alpha and beta radiation are particles that carry an electric charge and interact more strongly with matter, making them more ionizing than gamma radiation.

Read lesson note on Structure Of The Atom (WAEC)

Read lesson note on Periodic Chemistry (Nigeria Only) (WAEC)

Structure Of The Atom

Periodic Chemistry (Nigeria Only)

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