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Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

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586.

The number of Hydrogen ions in 1.0 $dm^{3}$ of 0.02 $moldm^{-3}$ tetraoxosulphate(VI) acid is $[N_{A} = 6.02 \times 10^{23}]$

$1.2 \times 10^{22}$

$1.2 \times 10^{23}$

$2.4 \times 10^{22}$

$2.4 \times 10^{23}$

View answer & explanation

Correct answer is A

$1mole = 6.02 \times 10^{23} ions$

$0.02moldm^{-3} = 0.02 \times 6.02 \times 10^{23}$

= $0.1204 \times 10^{23} = 1.204 \times 10^{22}$

$\approxeq 1.2 \times 10^{22}$

587.

Stainless steel is an alloy comprising of

Fe and C

Fe and Ni

Fe, C and Ni

Fe, C and Al

View answer & explanation

Correct answer is C

Stainless steel comprises iron (Fe), chromium (Cr), manganese (Mn), silicon (Si), carbon (C) and, in many cases, significant amounts of nickel (Ni) and molybdenum (Mo).

588.

The valence electrons of $_{12}Mg$ are in the

3s orbital

2p $_{x}$

2s orbital

1s orbital

View answer & explanation

Correct answer is A

$_{12}Mg = 2, 8, 2$

$= 1s^{2} 2s^{2} 2p^{6} 3s^{2}$

589.

The preferential discharge of ions during electrolysis is influenced by the