Tag: chemistry

Questions Related to chemistry

Arrange the density of three types of matter in decreasing order.

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

  1. gas, liquid, solid

  2. liquid, solid, gas

  3. liquid, gas, solid

  4. solid, gas, liquid

  5. solid, liquid, gas

Show answer
Correct Option: E
Explanation:

Density means how much dense or rigid the particles in a matter are. 


A solid is denser than the liquid and a liquid is denser than the gas.


Thus the decreasing order of density should be solid, liquid, gas. 


Hence, the correct option is E.

According to the concept of 'panch tattvas', the matter can be classified into the air, water, sky, fire, and earth.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

According to ancient philosophies, the matter was classified as air, water, earth, fire, and sky. This classification is based on the sources of matter. Since there are five sources, hence it was also called as 'panch tattvas'. 

At which temperature the density of water will be highest?

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

  1. $0^o C$

  2. $4^o C$

  3. $80^o C$

  4. $-4^o C$.

Show answer
Correct Option: B
Explanation:
In ice, the water molecules are in a crystal structure that has a lot of empty space.

When the ice melts to liquid water, the structure collapses and the density of the liquid increases.

At temperatures well above freezing, the molecules move faster and get further apart. The density decreases as temperature increases.

Now, let's cool the water.

As the temperature of warm water decreases, the water molecules slow down and the density increases.

At 4 °C, the clusters start forming.

Cluster formation is the bigger effect, so the density starts to decrease. 
Thus, the density of water is a maximum at 4 °C.

Option (B) is correct here.

Based on the physical properties, matter can be classified as _________.

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

  1. solid

  2. liquid

  3. gas

  4. all of these

Show answer
Correct Option: D
Explanation:

Based on the physical properties, the matter can be classified as solid, liquid, and gases.

Which of the following is liquid at ordinary temperature ?

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

  1. Germanium

  2. Gallium

  3. Gold

  4. Galena

Show answer
Correct Option: B

 The weight is required to get 2.24 litre of oxygen at STP is :

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

  1. 3.4 grams

  2. 34 grams

  3. 6.8 grams

  4. 68 grams

Show answer
Correct Option: A

10 gm of a gas at 1 atm and 273 K occupies 5 litres. The temperature at which the volume becomes double for the the mass of gas at the same pressure is :

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

  1. $273 K$

  2. $ - {273^ \circ }C\,\,$

  3. ${250^ \circ }C$

  4. ${546^ \circ }K$

Show answer
Correct Option: A

26cc of $CO _2$ are passsed over red hot coke .The volume of CO evolved is :


 ${C _{\left( s \right)}} + C{O _{2\left( g \right)}} \to 2C{O _{\left( g \right)}}$ 

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

  1. 15cc

  2. 10cc

  3. 52cc

  4. None of these

Show answer
Correct Option: C

At $0^o$C the density of nitrogen at $1$ atm is $1.25$ kg$/m^3$. The nitrogen which occupied $1500$ml at $0^o$C and $1$ atm was compressed at $0^o$C and $575$ atm and the gas volume was observed to be $3.92$ ml, in violation of Boyle's law. What was the final density of this non-ideal gas?

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

  1. $278$ $kg/m^3$

  2. $378$ $kg/m^3$

  3. $478$ $kg/m^3$

  4. $578$ $kg/m^3$

Show answer
Correct Option: A

In an evacuated rigid vessel of volume V liter, one mole of solid ammonium carbonate, $ NH _2CONH _4 $ , is taken and the vessel is hated to T K. The equilibrium total pressure of gases is found to be P atm. The percentage dissociation of solid into $ NH _3(g) $ and $ CO _2 (g) $ is 

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

  1. $ \dfrac { 100RT }{ 3PV } %$

  2. $ \dfrac { RT }{ 3PV } %$

  3. $ \dfrac { 100RT }{ PV } %$

  4. $ \dfrac { 300RT }{ PV } %$

Show answer
Correct Option: A