Tag: chemistry

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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

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.

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

Clinical thermometers are made up of glass. The important characteristic(s) considered for this selection is/are:

  1. it is a bad conductor of heat

  2. it is transparent

  3. both A & B

  4. it is strong
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Clinical thermometers are made up of glass because glass has very low co efficient of thermal expansion it is a bad conductor of heat and it is transparent.
Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

In which of the following, use of non metals is more as compared to metals?

  1. human body

  2. fertilisers

  3. crackers

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

Human body if formed of many non metals Carbon, Nitrogen, Oxygen, Hydrogen, Sulphur, Phosphorus and a bit of Chlorine. 
Fertilizers are composed of Nitrogen,phosphorous,potassium-NPK
Crackers are formed of Phosphorous and sulphur.

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

Aluminium foils are used to wrap food items.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aluminium foils are used to wrap food items

It is malleable means can change into sheet very easily.
Aluminium foil has smooth shiny surface. Due to which it reflects back the heat radiation emitted by the food. Hence food remains warm for a longer time.