311. Most common example of corrosion is?
A. Rusting of tin
B. Rusting of iron
C. Rusting of aluminium
D. Chemical decay
312. Morality is the number of moles of solute dissolved in?
A. 100 gram of solvent
B. 1 dm³ of solution
C. 1 dm³ of solvent
D. 1 kg of solution
313. Concentration is the ratio of?
A. Solute to solution
B. Solute to solvent
C. Solvent to solute
D. Solvent to solution
314. In the evaporation process, liquid molecules which leave the surface of the liquid have?
A. Very high energy.
B. Very low energy.
C. No energy.
D. Moderate energy.
315. Why does ice float on water?
A. Water is denser than ice.
B. Ice is denser than water.
C. Ice molecules move randomly.
D. Water molecules move randomly.
316. When an electronegative element combines with an electropositive element, the type of bonding is called?
A. Ionic
B. Metallic
C. Covalent
D. Coordinate covalent
317. Identify the wrong statement about ionization energy.
A. It decreases in a period
B. It decreases in a group
C. It is measured in KJ/mol
D. It is the absorption of energy
318. The isotope C-12 is present in abundance of?
A. 97.6%
B. 96.9%
C. 99.7%
D. 98.9%
319. The solubility of AgI in NaI solution is less than in pure water. This is because:
A. AgI forms a complex with NaI
B. Common ion effect
C. Solubility product of NaI is less than AgI.
D. Temperature of the solution decreases
320. The pH of water is 7 at 50 degrees Celsius. This water sample is:
A. Neutral
B. Acidic
C. Basic
D. None
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