Science test

CHAPTER 2 Class 9th- IS MATTER AROUND US PURE?

Multiple Choice Questions 1. Which of the following statements are true for pure substances? i. Pure substances contain only one kind of particles ii. Pure substances may be compounds or mixtures iii. Pure substances have the same composition throughout iv. Pure substances can be exemplified by all elements other than nickel (a) (i) and (ii) …

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Chapter-3, 9th Class Atoms and Molecule, Subject Science

1. Name two scientists who established the laws of chemical combination? 2. Give an example of a triatomic molecule of an element. 3. Define atomicity. 4. Write the atomicity of the following molecules: (i) Sulphur (ii) Phosphorus 5. What is an ion? Give one example. 6. Write the cations and anions present (if any) in …

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