Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

By what factor does water expand when converted into vapour at $100^o$C and $1$ atm pressure? The density of liquid water at $100^o$C and $1$ atm is $0.96$g $cm^{-3}$?

  1. $815$
  2. $2000$
  3. $1630$
  4. $500$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the ideal gas equation for water vapour at 100 degrees C and 1 atm, calculate the molar volume of steam. Comparing this molar volume to the volume of 1 mole of liquid water based on its given density yields the expansion factor.

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

When water is cooled it contracts until it reaches ______ and then it starts expanding.

  1. ${37^0}C$
  2. ${40^0}C$
  3. ${0^0}C$
  4. ${4^0}C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Though substances contract on cooling, water expand when cooled beyond ${4^0 C}$. This is known as anomalous behavior of water. The density of water is maximum at $4^0$$C$

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

A solid shape has _____ dimensions and so occupies _______.

  1. three, space

  2. two, space

  3. one, space

  4. no, space
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A solid object occupies three-dimensional space, meaning it has length, breadth, and height. This distinguishes it from two-dimensional shapes (area) or one-dimensional lines.

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

Which of the following cannot change, in a physical change?

  1. Volume

  2. Pressure

  3. Chemical composition

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

In a physical change the chemical composition of a substance does not change. 


For example conversion of water into steam where composition remain same i.e. $H _2O$.

Volume, pressure and temperature are the physical properties.

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

The state in which molecular attractions are very strong is:

  1. solid

  2. liquid

  3. gas

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

Solids are densely packed due to its  high intermolecular attractions so they are highly incompressible but liquid has less intermolecular attractions compared to solid.But gases have very less intermolecular attractions.So they are loosely packed.

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

Gases do not have a definite shape because:

  1. molecules exert no force of attraction or repulsion upon one another

  2. molecules exert force of attraction

  3. molecules exert force repulsion upon one another

  4. both b and c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The molecules exert no force of attraction or repulsion upon one another. I.e., the molecules are independent of each other. This is the reason gases do not have a definite shape.

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter
A solid cube of iron whose edge is 4 inches weighs 20.8 lbs. Determine the specific gravity of this sample of iron, if water weighs 62.4 pounds per cubic foot?
  1. $4.5$
  2. $5.2$
  3. $9.0$
  4. $27$
  5. $324$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$4$ inches $=$ $0.333$ foot


Since it is a solid cube, its volume is given by the formula $(side)^3$, that is, here its volume is $(0.333)^3$, that is $0.0369$ cubic foot.


Mass of the solid cube is $20.8$ pounds

Density $=$$\dfrac{Mass}{Volume}$

Thus, the density of the solid cube is $\dfrac{20.8}{0.0369}$, that is $563.68$ pounds per cubic foot.

Mass of water is $62.4$ pounds per cubic foot.

Thus, density of water is $\dfrac{Mass}{Volume}$, that is $\dfrac{62.4}{1}$, that is $62.4$ pounds per cubic foot.

Specific gravity of the solid iron  $= \dfrac {Density\ of\ solid\ iron} {Density\ of\ water}$

Thus, specific gravity of the iron is $=$ $\dfrac{563.68}{62.4}$, that is $9.033 \approx\ 9$

Hence, the correct option is C.

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

 Mass per unit volume can be defined as:

  1. volume

  2. weight

  3. density

  4. matter

  5. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mass per unit volume can be defined as density. For example : when 1 g of water has volume of 1 mL, the density of water will be 1 g/mL.
Density $\displaystyle = \dfrac {\text {mass}}{\text {volume}}$

Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

Which of the following is the most precise for measuring the volume of a liquid?

  1. Test tube

  2. Graduated cylinder

  3. Burette

  4. Volumetric flask

  5. Beaker
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Volumetric flask is the most precise for measuring the volume of a liquid.


When the values of different measurements are close to each other as well as to average value, such measurements are called precise.

Hence the correct option is D.