Tag: chemical properties of metals

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Questions Related to chemical properties of metals

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

Oxides of which of the following metals is reduced by aluminium powder?

  1. Magnesium

  2. Potassium

  3. Chromium

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

All metal oxides loses oxygen and are therefore reduced. Metals always occur in their oxidized state in ores. In order to convert an ore to its elemental state, it is reduced.

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

A metal $M$ does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify black coloured product is:

  1. $MgO$
  2. $CuO$
  3. $FeO$
  4. $ZnO$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The metal $M$ is copper $(Cu)$ which reacts with oxygen when heated in the air to form black coloured copper(ll) oxide. The reaction can be written as:
$2Cu + O _{2} \rightarrow 2CuO$

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

$   Mg        +          H _2O   \rightarrow $      

       (cold water)

  1. $MgO + H _2$
  2. $Mg _2O + H _2$
  3. $MgO + H _2O$

  4. The above reaction cannot occur
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium and zinc do not react with cold water. They form their respective oxides when reacted with hot water.
$   Mg        +          H _2O         \rightarrow           MgO         +       H _2  $
                            (hot water)

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

Metals like K, Na react ______ with cold water whereas Ca reacts_____ with cold water.

  1. Violently, less violently

  2. Mildly, violently

  3. Violently, violently

  4. Mildly, does not react
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals like Na, K react violently with cold water to evolve hydrogen gas that catches fire. Ca on other hand, reacts less violently with cold water giving out hydrogen gas which does not catch fire.

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

What does the pop sound indicate when sodium reacts with cold water?

  1. Release of oxygen

  2. Release of carbon dioxide

  3. Both A and B

  4. Release of hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in this reaction. Hence, it is stored in kerosene. To test for the release of hydrogen gas, place a lighted splint over the reacting metal - if it "pops" then hydrogen is present.