Question

10. If you pour water in a glass cylinder, you see upper and lower meniscus. If you use a plastic cylinder, the surface appears flat. Which of the following properties of water is responsible for the formation of the meniscus?

High heat of vaporization

Cohesion and Adhesion

Excellent solubility

maintenance of pH

17.

If you were to make 200 mL of 3% sugar solution, how much sugar would you have to weigh?

2 g

12 g

6 g

1.5 g

18.

The blood concentration is 0.9%.
If you were to make 1 L of intravenous (IV) fluid, how much salt would you need to weigh?

0.9 g

1.8 g

9 g

22.

The atomic number of magnesium is 12.
Its atomic weight is 24.
How many valence electrons does the atom of magnesium have?

12

2

8

23.

Helium, argon and neon are called noble gases.
How are they different from hydrogen, oxygen and carbon?

H, O and C have complete valence shell, while He, Ar and Ne have incomplete valence shell

He, Ar and Ne have fewer number of electrons than H, O and C

He, Ar and Ne have complete valence shell, while H, O and C have incomplete valence shell

He, Ar and Ne can easily combine with atoms of other elements, while H, O and C cannot combine with other atoms

25.

Carbon atoms can exist in 12C form and 14C form.
What is the difference between the two forms?

they have same mass number but different atomic number

Different number of electrons

Different number of protons

Different number of neutrons

None of the above is true

26.

Radioactive isotopes emit high energy radiation that can damage the genetic material inside human cells.
In spite of this fact, for which of the following are they used?

For medical treatments such as an over-active thyroind gland secretion

To determine the age of fossilized dinosaur

All of the above

27

__ is due to transfer of electrons from one atom to another.

polar covalent bond

ionic bond

non-polar covalent bond

28.

_______ is due to equal sharing of electrons between two atoms.

hydrogen bond

ionic bond

non-polar covalent bond

32.

Bond that keeps two water molecules together is the

hydrogen bond

ionic bond

non-polar covalent bond

Answer 1

10. Cohesion and Adhesion

17. 6gm

18. 9gm

22. Magnesium has 2 valence electrons.

23. He, Ar, Ne have complete valence shell while H, O, C have incomplete valence shell.

25. Different number of neutrons.

26. All of the above

27. Ionic bond

28. Non polar covalent bond

32. Hydrogen bond