Tag: chemical properties and uses of metals and non-metals

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Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

Which of the following non-metal is commonly used for purifying water?

  1. Sulphur

  2. Oxygen

  3. Chlorine

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

Chlorine is one of the most commonly used disinfectants for water disinfection. Chlorine can be applied for the deactivation of most microorganisms and it is relatively cheap. Although several methods eliminate disease-causing microorganisms in water, chlorination is the most commonly used. Chlorination is effective against many pathogenic bacteria, but at normal dosage rates it does not kill all viruses, cysts, or worms. When combined with filtration, chlorination is an excellent way to disinfect drinking water supplies.

Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

Tungsten filament is:

  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

Tungsten filament represents metallic substance.
Tungsten is a metal. Other examples of metals include iron, copper, aluminium, magnesium, sodium, lead, zinc etc.

Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. The non-metal is :

  1. iodine

  2. bromine

  3. chlorine

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

Iodine is a natural dark violet, non-metallic element that plays a key role in human metabolism. Iodine, for example, is slightly soluble in water and gives a yellowish-brown solution. Brown solutions are also formed with alcohol.
Iodine is usually used in an alcohol solution (called tincture of iodine) or as Lugol's iodine solution as a pre- and postoperative antiseptic. Some people do not recommend disinfecting minor wounds with iodine because of concern that it may induce scar tissue formation and increase healing time.

Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

The oxides of nonmetal which is neutral is :

  1. $SO _2$
  2. $NO _2$
  3. $P _2O _3$
  4. $CO$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Neutral oxides are the oxides which show neither basic nor acidic properties when they react with water and they do not form salts when reacted with acids or bases, e.g., carbon monoxide$ (CO)$,nitrous oxide$ (N _2O)$,nitric oxide $(NO),$ etc., are neutral oxides.