What happens when NaCl melts?

B. The electrostatic forces of attraction between ions are overcome

A. The covalent bonds between sodium and chlorine atoms break

B. The electrostatic forces of attraction between ions are overcome

C. The sodium and chlorine atoms decompose into subatomic particles

D. The metallic bonds holding the crystal lattice disintegrate

Everyday Science · Atoms, Elements & Compounds · page 2 of 20

Compounds MCQs with Answers

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Compounds MCQs (11–20)

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11.
All of the following are polysaccharides, except?
Correct Answer: C. Rubber
One-liner
Rubber is not a polysaccharide; it is a polymer of isoprene (a hydrocarbon), whereas starch, cellulose, and glycogen are all polysaccharides made of glucose units.
12.
Which compound shows maximum hydrogen bonding with water?
Correct Answer: A. C5H5OH
One-liner
C5H5OH (phenol) shows maximum hydrogen bonding with water among the given options due to the presence of an –OH group attached to an aromatic ring, which enhances its hydrogen bonding capability.
13.
Give the IUPAC name of the compound (C6H5-CH(CH3)-CH2-CH3)?
Correct Answer: A. 2-phenylbutane
One-liner
The IUPAC name of C6H5-CH(CH3)-CH2-CH3 is 2-phenylbutane.
14.
The four bonds of carbon in methane are directed towards the corners of _?
Correct Answer: B. Tetrahedron
One-liner
The four bonds of carbon in methane are directed towards the corners of a tetrahedron.
15.
At room temperature, most of the ionic compounds are ?
Correct Answer: A. Crystalline solids
One-liner
At room temperature, most ionic compounds exist as crystalline solids due to the strong electrostatic forces of attraction between oppositely charged ions arranged in a regular lattice structure.
16.
How many moles are there in 60g of sodium hydroxide (NaOH)?
Correct Answer: B. 2 moles
One-liner
There are 2 moles in 60g of sodium hydroxide (NaOH) because the molar mass of NaOH is 40 g/mol (Na=23, O=16, H=1) and 60 ÷ 40 = 1.5 moles.
17.
Which one among the following is a hydrocarbon compound?
Correct Answer: B. Candle wax
One-liner
Candle wax is a hydrocarbon compound because it is composed primarily of hydrogen and carbon atoms.
18.
Which functional group is characteristic of ester?
Correct Answer: B. R-CO-OR
One-liner
The characteristic functional group of an ester is R-CO-OR, where a carbonyl group is bonded to an alkoxy (OR) group.
19.
The IUPAC name of iso-octane is?
Correct Answer: C. 2,2,4-Trimethylpentane
One-liner
The IUPAC name of iso-octane is 2,2,4-Trimethylpentane.
20.
What happens when NaCl melts?
Correct Answer: B. The electrostatic forces of attraction between ions are overcome
One-liner
When NaCl melts, the electrostatic forces of attraction between ions are overcome, allowing the ions to move freely while the ionic bonds remain intact.

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Compounds MCQs with Answers

Compounds MCQs (11–20)

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