Mixtures and Compounds NDA Questions

NDA Chemistry

Mixtures and Compounds MCQ Questions


13.
A solution has these properties: uniform composition, particles less than 1 nm, no Tyndall effect, stable (does not settle), cannot be filtered. These are properties of:
A.
A heterogeneous mixture
B.
A colloidal solution
C.
A true solution
D.
A suspension
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ANSWER :
C. A true solution
14.
What is the effect of temperature on the solubility of most solid solutes in water?
A.
Solubility decreases with increase in temperature for all solutes
B.
Temperature has no effect on solubility
C.
Solubility of most solid solutes increases with increase in temperature
D.
Solubility first increases then decreases as temperature rises
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ANSWER :
C. Solubility of most solid solutes increases with increase in temperature
15.
What is the formula for calculating the 'mass by volume percentage' concentration of a solution?
A.
Mass/Volume % = (Volume of solute / Mass of solution) × 100
B.
Mass by Volume % = (Mass of solute in grams / Volume of solution in mL) × 100
C.
Mass/Volume % = (Mass of solute / Mass of solvent) × 100
D.
Mass/Volume % = (Mass of solution / Volume of solute) × 100
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ANSWER :
B. Mass by Volume % = (Mass of solute in grams / Volume of solution in mL) × 100
16.
How does a colloidal solution differ from a true solution in terms of the Tyndall effect?
A.
Both show identical Tyndall effect
B.
A colloidal solution SHOWS the Tyndall effect (particles scatter light, making the beam visible) while a true solution does NOT show it (particles too small to scatter light)
C.
Neither true solutions nor colloids show Tyndall effect
D.
True solutions show Tyndall effect; colloidal solutions do not
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ANSWER :
B. A colloidal solution SHOWS the Tyndall effect (particles scatter light, making the beam visible) while a true solution does NOT show it (particles too small to scatter light)
17.
From the following NCERT examples, which pair consists of DIFFERENT types of colloidal systems?
A.
Milk (emulsion: liquid dispersed in liquid) and Fog (aerosol: liquid dispersed in gas)
B.
Milk and butter (both emulsions)
C.
Fog and clouds (both aerosols)
D.
Smoke and dust (both aerosols of solid in gas)
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ANSWER :
A. Milk (emulsion: liquid dispersed in liquid) and Fog (aerosol: liquid dispersed in gas)
18.
Which of the following correctly identifies the dispersed phase and dispersion medium in SMOKE?
A.
Dispersed phase: solid particles (carbon, ash); Dispersion medium: gas (air)
B.
Dispersed phase: gas (air); Dispersion medium: solid (carbon)
C.
Dispersed phase: liquid water; Dispersion medium: gas (air)
D.
Dispersed phase: gas; Dispersion medium: liquid
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ANSWER :
A. Dispersed phase: solid particles (carbon, ash); Dispersion medium: gas (air)