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

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.

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 mixtures is used in the preparation of tips of match sticks?

  1. $S +K$
  2. $Sb _2S _3+S$
  3. $K _2Cr _2O _7+S+P$
  4. $P+K$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The heads of safety matches contain antimony trisulfide $Sb _2S _3$, potassium chlorate, sulfur, powdered glass, inert fillers, and animal glue.

Hence option $B$ is correct.