Tag: metals

Quizzes (9) Questions (306)

Questions Related to metals

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

Which of the following exists as cations with delocalized electrons?

  1. Non-polar covalent substance

  2. Polar covalent substance

  3. Ionic substance

  4. Metallic substance

  5. Noble gas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metallic substance exists as cations with delocalized electrons.
The positive ions (cations) are arranged to form a kernel in the sea of delocalised electrons. The force of attraction between the positive ions (cations)  and  the sea of delocalised electrons is called the metallic bond.

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

Which one of these gas is released when Na reacts with cold water?

  1. $H _2$
  2. $Cl _2$
  3. $O _2$
  4. $H _2O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reaction of 'Na' with cold water. 

$ 2Na+H _{2}O\rightarrow Na _{2}O+H _{2} \uparrow $
               The reaction stops with forming $ Na _{2}O $ . Because, we used cold water. The reaction doesnt continue to form NaOH.

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

Which of the following is added to remove permanent hardness of water?

  1. baking soda

  2. blue vitriol

  3. washing soda

  4. milk of magnesia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

By adding Na$ _{2} $Co$ _{3} $, all the Ca$ ^{+2} $ and and Mg$ ^{+2} $ ions which causes permanent hardness are replaced by Na$ ^{+} $, which doesn't cause hardness.

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

Sodium hydroxide in water gives

  1. yellow color solution.

  2. green color solution.

  3. colorless solution.

  4. light pink solution.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sodium hydroxide in water gives colorless solution.
Sodium hydroxide is colourless. In water, it dissociates into sodium ions and chloride ions. These ions are also colourless.
$\displaystyle NaOH (aq)   \xrightarrow{H _2O} Na^+ (aq) + OH^- (aq)$