M.c.q on chemistry ?

1. What is the atomic number of an element?
a) The number of protons in the nucleus
b) The number of neutrons in the nucleus
c) The number of electrons in the outer shell
d) The total number of protons and neutrons in the nucleus

2. What is the chemical symbol for gold?
a) Au
b) Ag
c) Fe
d) Cu

3. What is the pH of a neutral solution?
a) 0
b) 7
c) 14
d) -7

4. Which of the following is a noble gas?
a) Oxygen
b) Helium
c) Nitrogen
d) Carbon

5. What is the chemical formula for water?
a) H2O2
b) CO2
c) H2O
d) NaCl

6. What is the process by which a solid changes directly into a gas?
a) Sublimation
b) Condensation
c) Evaporation
d) Deposition

7. Which of the following is a non-metal?
a) Sodium
b) Iron
c) Oxygen
d) Calcium

8. What is the chemical formula for table salt?
a) NaCl
b) H2O
c) CO2
d) HCl

9. What is the unit of measurement for the amount of a substance in chemistry?
a) Gram
b) Liter
c) Mole
d) Kelvin

10. What is the process by which a substance changes from a gas to a liquid?
a) Condensation
b) Evaporation
c) Sublimation
d) Deposition

1. Which of the following is the chemical symbol for gold?
(a) Au
(b) Ag
(c) Cu
(d) Fe

2. What is the pH of a neutral solution?
(a) 0
(b) 7
(c) 14
(d) 10

3. Which of the following is an acid?
(a) HCl
(b) NaOH
(c) NH3
(d) CH3OH

4. What is the empirical formula of a compound with the molecular formula C6H12O6?
(a) CH2O
(b) CH3O
(c) C2H4O2
(d) C6H12O6

5. What is the molar mass of sodium chloride (NaCl)?
(a) 23 g/mol
(b) 35.5 g/mol
(c) 58.5 g/mol
(d) 71 g/mol

6. Which of the following is a Lewis acid?
(a) H+
(b) OH-
(c) Na+
(d) Cl-

7. What is the oxidation number of nitrogen in ammonia (NH3)?
(a) -3
(b) -2
(c) -1
(d) 0

8. Which of the following is a strong electrolyte?
(a) HCl
(b) H2O
(c) CH3OH
(d) NH3

9. What is the conjugate acid of water?
(a) H2O
(b) H3O+
(c) OH-
(d) H+

10. Which of the following is a greenhouse gas?
(a) CO2
(b) O2
(c) N2
(d) H2O

Answer Key:
1. (a)
2. (b)
3. (a)
4. (a)
5. (c)
6. (a)
7. (d)
8. (a)
9. (b)
10. (a)