Question

exam lesson name: chemistry
exam number: 700700rr
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question 18 of 20 :
select the best answer for the question.

1. which statement is true about alkali metals?

○ a. they arent conductors of heat or electricity.
○ b. they arent very reactive.
○ c. some of them explode when exposed to water.
○ d. theyre in group 18 of the periodic table.

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Explanation:

• Option A: Alkali metals are good conductors of heat and electricity, so A is false.
• Option B: Alkali metals are highly reactive, so B is false.
• Option C: Some alkali metals (like sodium, potassium) react vigorously with water, and some can explode, so C is true.
• Option D: Alkali metals are in group 1 of the periodic table, group 18 is noble gases, so D is false.

Answer:

C. Some of them explode when exposed to water.