Tag: objects that float or sink

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Multiple choice chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

The EMF of the cell: Ag, AgCl in $0.1 M - KCl \parallel$ satd. $ NH _{4}NO _{3}\parallel 0.1 M - Ag NO _{3},$ Ag is 0.42 V at $ 25^{\circ}C.$ 0.1 M-KCl is 50% dissociated and $0.1 M - Ag NO _{3}$ is 40% dissociated. The solubility product of $ AgCl $ is $ (2.303 RT/F = 0.0)$

  1. $1.0 \times 10^{-10} $
  2. $ 2.0 \times 10^{-9} $
  3. $ 1.0 \times 10^{-9}$
  4. $ 2.0 \times 10^{-10} $
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using the Nernst equation and the given dissociation constants, one can calculate the concentration of Ag+ ions and Cl- ions to find the solubility product Ksp = [Ag+][Cl-].

Multiple choice chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

Maximum of 9.72 g of potassium chloride dissolves in 30 g of water at $70^{\circ}$C. The solubility of potassium chloride at $70^{\circ} C$ is:

  1. 3.24 g

  2. 32.4 g

  3. 0.324 g

  4. 33.4 g
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solubility is defined as solubility of different substances in grams per 100 gm of water.
30 gm of water dissolves 9.72 g of $KCl$.
So, 100gm will dissolve in $9.72\times 100/30=32.4$ gm.

Multiple choice chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

What do you understand by the statement "the solubility of copper sulphate in water at $20^{\circ}C$ is 20.7 g" ?

  1. A maximum of 20.7 grams of copper sulphate can be dissolved in 100 ml water at a temperature $20^{\circ}$C.
  2. A maximum of 20.7 grams of copper sulphate can be dissolved in 100 g of water at $20^{\circ}$C.
  3. A maximum of 20.7 grams of copper sulphate can be dissolved in 79.3 g of water at $20^{\circ}$C.
  4. A maximum of 20.7 grams of copper sulphate can be dissolved in 79.3 ml of water at $20^{\circ}$C.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solubility is given in grams per 100 gm of water with temperature and 1 atmospheric pressure.

Multiple choice chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

In the solvation of $NaCl$ in water, which of the following occur ?

  1. Hydrogen atom interacts with $Cl^-$ atom
  2. Oxygen atom interacts with $Na^+$ atom
  3. Both $A$ and $B$

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

In the water molecule oxygen has higher electronegativity than hydrogen thus has a partial negative charge and hydrogen has a partial positive charge. So during the solvation of NaCl in water, hydrogen atoms interact with chlorine anion and oxygen interact with sodium cation.

Multiple choice chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

______ is the chief component of natural gas.

  1. Ethane

  2. Methane

  3. Propane

  4. Butane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Natural gas is a fossil fuel. It is used for cooking, heating and electricity generation. It is found deep underground rock formation. It is a naturally occurring hydrocarbon gas mixture consisting primarily of methane. It is also used as fuel for vehicles.