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Chemistry 1 Marks Question

Solutions · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 54 questions.

Questions · Page 2 of 2

1 Marks Question

Question 511 Mark
Under what condition do non-ideal solutions show negative deviations?
Answer
When the new forces of interaction between the components are stronger than those in the pure components, then non-ideal solutions show negative deviations.
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Question 521 Mark
Amongst the following compounds, identify which are insoluble, partially soluble and highly soluble in water?
  1. phenol.
  2. toluene.
  3. formic acid.
  4. ethylene glycol.
  5. chloroform.
  6. pentanol.
Answer
Insoluble: toluene, chloroform.
Partially soluble: phenol, pentanol.
Highly soluble: formic acid, ethylene glycol.
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Question 531 Mark
Define the following term:
Molality.
Answer
Molality:

Molality (m) is defined as the number of moles of the solute per kilogram of the solvent. It is expressed as:

$\text{Molality (m)}=\frac{\text{Moles of solute}}{\text{Mass of solvent in kg}}$

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Question 541 Mark
Define molal elevation constant or ebullioscopic constant.
Answer
Molal elevation constant is defined as the elevation in boiling point when one mole of non-volatile solute is added to one kilogram of solvent.
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1 Marks Question - Page 2 - Chemistry STD 12 Science Questions - Vidyadip