Tag: materials around us

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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

 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
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.