Tag: reactions of metals

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

A metal which reacts with cold water vigorously producing hydrogen is:

  1. zinc

  2. hydrogen

  3. sodium

  4. mercury
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced. The speed and violence of the reaction increases as you go down the group. This shows that the reactivity of thealkali metals increases as you go down group 1. And sodium is a group 1 element.

The correct option is C.

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.