Ques: Q: What form does formaldehyde take at room temperature? Choices: - solid - liquids - plasma - gas A:
Ans: gas

Ques: Q: What is a combination of two or more substances in any proportions called? Choices: - Combination - structure - mix - mixture A:
Ans: mixture

Ques: Q: Where does most of the earth's energy come from? Choices: - magnetic field - its core - its atmosphere - sun A:
Ans: sun

Ques: Q: How does litmus paper indicate the ph value of a solution? Choices: - by texture - by shape - by smell - by color A:
Ans:
by color