Tag: introduction to 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 one of the following nutrients is not available in fertilizers?

  1. Nitrogen

  2. Phosphorus

  3. Iron

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

Potassium, Nitrogen and Phosphorous are normally derived from the soil in the form of inorganic salts and are nutrients available in fertilizers which make up 0.5 to 6.0 per cent. Hence iron is nutrient which is not available in fertilizers.

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

Non-metals which are present in fertilizers and enhance the growth of plants is:

  1. nitrogen

  2. phosphorus

  3. potassium
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Non-metals which are present in fertilizers and enhance the growth of plants are nitrogen and phosphorus. Potassium is a metal. It is also present in fertilizers.

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

The glass bulb of electric bulbs becomes black due to the deposition of vapour from the:

  1. glass of the bulb

  2. metal filament

  3. gas in the bulb

  4. joint in the glass
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Over the life of an incandescent light bulb, the filament begins to deteriorate and the particles will settle on the inside of the glass. In return the bulb will take on a grayish appearance and a slight decrease in light output may occur.
  • For fluorescent bulbs only, the ends will blacken as the bulb is burned. Each time the lamp is turned on and off the emissions material settles on the inside of the glass. Extreme darkening generally indicates the bulb is about to burn out.
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  useful as a rocket fuel?

  1. $Cl$
  2. $H _2$
  3. $S$
  4. $N _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrogen -- a light and extremely powerful rocket propellant -- has the lowest molecular weight of any known substance and burns with extreme intensity.  In combination with an oxidizer such as liquid oxygen, liquid hydrogen yields the highest specific impulse, or efficiency in relation to the amount of propellant consumed, of any known rocket propellant.