Tag: chemistry

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

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

  1. gas, liquid, solid

  2. liquid, solid, gas

  3. liquid, gas, solid

  4. solid, gas, liquid

  5. solid, liquid, gas
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

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

  1. True

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

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

At which temperature the density of water will be highest?

  1. $0^o C$
  2. $4^o C$
  3. $80^o C$
  4. $-4^o C$.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice chemistry materials around us and different types of houses materials around us matter and its states different states of matter

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

  1. 3.4 grams

  2. 34 grams

  3. 6.8 grams

  4. 68 grams
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At STP, 1 mole of any gas occupies 22.4 liters. 2.24 liters of O2 is 0.1 moles. The molar mass of O2 is 32 g/mol. Mass = 0.1 moles * 32 g/mol = 3.2 grams. The closest option is 3.4 grams, likely due to a typo in the question or options.

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

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


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

  1. 15cc

  2. 10cc

  3. 52cc

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The reaction is C(s) + CO2(g) -> 2CO(g). According to the stoichiometry, 1 volume of CO2 produces 2 volumes of CO. Therefore, 26cc of CO2 will produce 26 * 2 = 52cc of CO.

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

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?

  1. $278$ $kg/m^3$
  2. $378$ $kg/m^3$
  3. $478$ $kg/m^3$
  4. $578$ $kg/m^3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Density is calculated as mass divided by volume. The total mass of the nitrogen gas remains constant throughout the compression process. By finding the initial mass from the initial volume and density, and dividing it by the final volume of 3.92 ml, the resulting density is obtained.

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

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 

  1. $ \dfrac { 100RT }{ 3PV } %$
  2. $ \dfrac { RT }{ 3PV } %$
  3. $ \dfrac { 100RT }{ PV } %$
  4. $ \dfrac { 300RT }{ PV } %$
Reveal answer Fill a bubble to check yourself
A Correct answer