Tag: metals

Quizzes (9) Questions (306)

Questions Related to metals

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Among the metals, the one that cannot be obtained by the reduction of its metal oxide.

  1. $Cr$
  2. $Fe$
  3. $Mn$
  4. $Mg$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Actually the oxides of metals like Zn,Pb and other metals which are not very reactive can be reduced by Carbon. However oxides of very reactive metals (eg Aluminium,Chromium) can't be reduced by Carbon . Since they are very reactive they react with carbon to form their carbides hence are not effective in reduction.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Metals such as lead, copper, silver and gold do not react with water at all.

  1. Statement is False

  2. Statement is True

  3. Lead reacts but copper, silver, and gold do not

  4. Copper reacts but lead, silver and gold do not.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lead, copper, silver, and gold are low in the reactivity series. They do not react with cold or hot water, nor with steam, unlike highly reactive metals like sodium or potassium.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

The gaseous product formed when magnesium reacts with boiling water is :

  1. hydrogen

  2. washing soda

  3. sulphurous

  4. calcium oxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrogen gas is formed when magnesium reacts with water to form its hydroxide as Mg is highly reactive with water and acids. It is present on the top of the activity series. So, it is a very reactive metal.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Which of the following compounds can be reduced to copper when heated with coke?

  1. Copper sulphate

  2. Copper oxide

  3. Hydrogen chloride

  4. Ammonia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The metals, which are low in the reactive series, undergo reduction reaction. Their metal oxides react with carbon to reduce the metal oxide to its metal and form an oxide of carbon.
$2CuO+C \rightarrow 2Cu+CO _2$

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

 Name a metal which reacts with steam?

  1. Sodium

  2. Potassium

  3. Lithium

  4. Magnesium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metals from magnesium to iron in the activity series of metals, react with steam (but not $H _2O$) to form the metal oxide and hydrogen gas.

$\text{Magnesium + steam} \to \text{Magnesium oxide + Hydrogen}$
$Mg + H _2O \to MgO + H _2\uparrow$

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Name the following: A metal which does not react with cold water but reacts with steam.

  1. Magnesium

  2. Iron

  3. Zinc

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium has almost no reaction with cold water. It reacts very slowly with hot water.  It reacts with steam when being heated and gives hydrogen gas and metal oxide.
Magnesium + Water $\rightarrow$  Magnesium hydroxide + Hydrogen gas
Zinc and iron do not react with cold or hot water.  They react with  steam slowly to give the respective oxides:
Zinc + Steam $\rightarrow$  Zinc oxide  + Hydrogen gas
Iron + Steam $\rightarrow$ Iron(II) iron(III) oxide  + Hydrogen gas