Question

q.10. how many different atoms are there in the following molecule? a) 2 b) 3 c) 7 d) 8 q.11. which of the following is a heterogeneous mixture? a) air b) steel c) soil d) salt water q.12. which of the following is a homogeneous mixture? a) sand in a bottle of water b) lemonade c) salad d) mercury

Explanation:

• Q.10: Count the distinct - looking atoms in the molecule shown.
• Q.11: Heterogeneous mixtures have visibly different components. Air is a homogeneous mixture of gases, steel is an alloy (homogeneous), salt - water is a homogeneous solution, and soil has different components like rocks, organic matter etc., making it heterogeneous.
• Q.12: Homogeneous mixtures have uniform composition throughout. Lemonade is a solution of sugar, lemon juice etc. in water and is homogeneous. Sand in water is heterogeneous, salad is heterogeneous, and mercury is an element not a mixture.

Answer:

Q.10: d) 8
Q.11: c) Soil
Q.12: b) Lemonade