The IUPAC name of complex Na₃[Co(NO₂)₆] is?

B. Trisodium hexanitrocobaltate (III)

A. Sodium hexanitrocobaltate (III)

B. Trisodium hexanitrocobaltate (III)

C. Sodium hexanitrocobalt (III)

D. Trisodium cobalt hexanitrite

Everyday Science · Atoms, Elements & Compounds · page 3 of 13

Some Important Compounds MCQs with Answers

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Some Important Compounds MCQs (21–30)

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21.
Propanoyl chloride is a member of?
Correct Answer: D. Acid halides
One-liner
Propanoyl chloride is a member of acid halides (also called acyl halides).
22.
In which of the following disaccharides both the basic structural units are the same?
Correct Answer: C. Maltose
One-liner
Maltose is the disaccharide in which both basic structural units (monosaccharides) are the same — two glucose molecules — whereas lactose is made of glucose and galactose, and sucrose is made of glucose and fructose.
23.
2CuSO4 is called ?
Correct Answer: A. Gypsum
One-liner
2CuSO₄ (actually CaSO₄·2H₂O) is called Gypsum, which is calcium sulfate dihydrate.
24.
Which aqueous solution has the highest pH?
Correct Answer: C. 0.1M Na₂CO₃
One-liner
0.1M Na₂CO₃ has the highest pH because it is a salt of a strong base and a weak acid, making its aqueous solution strongly alkaline.
25.
Pearl comprises calcium carbonate.
Correct Answer: A. 90%
One-liner
Pearl comprises 90% calcium carbonate.
26.
The IUPAC name of complex Na₃[Co(NO₂)₆] is?
Correct Answer: B. Trisodium hexanitrocobaltate (III)
One-liner
The IUPAC name of Na₃[Co(NO₂)₆] is Trisodium hexanitrocobaltate (III).
27.
At least how many saccharide units must be present in a polysaccharide?
Correct Answer: C. 11
One-liner
A polysaccharide must contain at least 11 monosaccharide (saccharide) units.
28.
The formula of fibroin protein is ?
Correct Answer: A. C15H23N5O6
One-liner
The formula of fibroin protein is C15H23N5O6.
29.
What is the name of common salt?
Correct Answer: A. Sodium chloride
One-liner
Common salt is chemically known as sodium chloride (NaCl).
30.
What is the colour of Copper Sulphate?
Correct Answer: A. Blue
One-liner
Copper sulphate is blue in colour in its hydrated crystalline form.

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Some Important Compounds MCQs with Answers

Some Important Compounds MCQs (21–30)

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