Tag: element, compound and chemical reaction

Quizzes (24) Questions (6)

Questions Related to element, compound and chemical reaction

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

Plasma state contain ionized gas particles.

  1. True

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

Plasma state is obtained by heating gases to very high temperature. During heating of the gases, the electrons get extracted from the atom. Because of this the formation of the positively charged nucleus and negatively charged electrons takes place in the gas. This causes ionization of the gas.

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

Bose-Einstein condensate state is obtained by cooling of the substance below _____.

  1. $-273^0C$
  2. $273^0C$
  3. $273K$
  4. $295K$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bose-EInstein condensate (BEC) is the fifth state of matter which is obtained by supercooling of the substance below $-273^0C$. This state of matter is artificially prepared in a laboratory because it is difficult to obtain such a low temperature naturally.

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

The shining of the sun and stars is due to the __________ state of matter.

  1. plasma

  2. Bose-Einstein condensate

  3. solid

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The shining of the sun and stars is due to the plasma state of matter. The plasma state causes ionization of the gases which causes shining of the substance.

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

Gas can be turned into a plasma on earth with the addition of:

  1. great amounts of energy

  2. great amounts of liquid

  3. another gas

  4. water

  5. great amounts of time
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plasma is called fourth state of matter. In this state every substance remains in gaseous state, this gas has only ions and free electrons. This state is obtained by freeing all the electrons from the attraction of nucleus. To make the electrons free from nucleus we have to give them energy equal to or greater than the energy by which they are bound with nucleus, therefore for that we require a great amount of energy.

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

Plasma state refers to:

  1. super cooled gaseous state

  2. super heated gaseous state

  3. super cooled liquid state

  4. super heated liquid state
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plasma state refers to the super heated gaseous state.
Plasma state is obtained by heating a gas above 5000 $^o$C. The number of electrons in the atoms or molecules decreases or increases, to form positively or negatively charged ions and also the molecular bond breaks.

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

The fluorescent tubes and neon sign bulbs glow due to the presence of ____________.

  1. charged particles

  2. high voltage

  3. high temperature

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

When an application of high voltage is provided to the electrodes, the neon gas ionizes due to the flow of $e^-$ which thereby excite the neon gas atoms and cause them to emit light. In the case of fluorescent tubes, low-pressure mercury vapour is present which emits UV light when ionized.