Tag: chemical properties of metals

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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

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

On reaction with water, an active metal produces:

  1. oxygen

  2. nitric acid

  3. base

  4. metal hydroxide

  5. none of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reactivity of active metals can be demonstrated by dropping pieces of $Li, Na, K$ into water. $Li$ reacts slowly with water, $Na$ reacts more rapidly and $K$ reacts violently. For a reaction between sodium and water, it can be divided into two halves. One-half reaction describes what happens when sodium atoms lose electrons. The other half describes what happens when water molecules gain these electrons. An overall equation is obtained for the reaction which shows the formation of metal hydroxide and evolution of hydrogen gas.
$2Na\left( s \right) +2{ H } _{ 2 }O\left( l \right) \rightarrow 2{ Na }^{ + }\left( aq \right) +2{ OH }^{ - }\left( aq \right) +{ H } _{ 2 }\left( g \right) \uparrow $

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

Metals combine with oxygen to produce:

  1. neutral acid

  2. basic oxide

  3. acidic acid

  4. amphoteric oxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
An oxide that combines with water to give an acid is termed as an acidic oxide. The oxide that gives a base in water is known as a basic oxide.
Generally Group 1 and Group 2 metals  form bases called base anhydrides or basic oxides e.g.,
$4K+O _2 \rightarrow 2K _2O$
Basic oxides are the oxides of metals. If soluble in water, they react with water to produce hydroxides (alkalies) e.g.,
$K _2O(s)+H _2O(l) \rightarrow 2KOH(aq)$)

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

Name one metal that will not react with cold water but will react with steam.

  1. Zinc

  2. Iron

  3. Calcium

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

Zinc is a metal which doesnot react with cold water but reacts with steam. The chemical equation for the reaction can be written as:
$ Zn + H _{2}O \rightarrow ZnO + H _{2}$
         (steam)