Tag: all about mixtures

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Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

A true solution is a homogeneous mixture of solute and solvent. Chalk powder in water is a heterogeneous mixture. Hence chalk powder is not a true solution.

  1. True

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

A true solution has solute completely dissolved in the solvent. In case of chalk powder, it does not completely dissolve in water. Hence chalk powder in water is a heterogeneous mixture & is not a true solution.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Substance that is able to get dissolved in solvent is said to be:

  1. solute

  2. insoluble

  3. solvent

  4. soluble
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Soluble substances are those that easily dissolve in a solvent, such as water, and include sugar, salt, alcohol and some dish-washing detergents. In chemistry, solubility of a substance is a quantitative term that refers to the amount of substance that can dissolve in a given volume of a solvent.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Which type of solution is not filtrable through filter paper and parchment membrane both?

  1. True solution and colloidal sol

  2. Colloidal sol and suspension

  3. True solution and suspension

  4. Suspension only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Filter paper has the pore size of $11 \times 10^{-12}$ m.
Parchment paper Pore size $4.5\times 10^{-13}$ m.
Colloidal solution particle size is $10^-5$ to $10^-2$ m.
True solution particle size is $10^-2$ m.
Suspension solution  Size of particles  usually larger than $10^{-12}$.
So it's cannot pass through Filter paper and Parchment paper both.
Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Mixture of $MgCO _{3}$ & $NaHCO _{3}$ on strong heating gives $CO _{2}$ & $H _{2}O$ in $3 : 1$ mole ratio. The weight $\%$ of $NaHCO _{3}$ present in the mixture is :

  1. $30\%$
  2. $80\%$
  3. $40\%$
  4. $50\%$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heating MgCO3 gives CO2, and heating NaHCO3 gives CO2 and H2O. Let x be moles of MgCO3 and y be moles of NaHCO3. The total CO2 is x + 0.5y and H2O is 0.5y. Given (x + 0.5y) / (0.5y) = 3/1, we find x = y. Calculating the mass percentage based on molar masses (MgCO3=84, NaHCO3=84) leads to 50%.