Chemistry MCQ GK

Total Questions: 100

1) What is the chemical formula for water?

a) H2O

b) CO2

c) O2

d) NaCl

2) What is the pH of pure water?

a) 0

b) 7

c) 14

d) 10

3) Which gas is produced during photosynthesis?

a) Oxygen

b) Carbon dioxide

c) Nitrogen

d) Hydrogen

4) What is the chemical symbol for gold?

a) Ag

b) Au

c) Pb

d) Fe

5) Which element is a noble gas?

a) Oxygen

b) Nitrogen

c) Neon

d) Hydrogen

6) What is the primary component of the air we breathe?

a) Oxygen

b) Carbon dioxide

c) Nitrogen

d) Argon

7) What is the chemical formula for table salt?

a) NaCl

b) KCl

c) CaCl2

d) MgCl2

8) What is the most abundant element in the universe?

a) Hydrogen

b) Helium

c) Oxygen

d) Carbon

9) Which of the following is an alkali metal?

a) Sodium

b) Calcium

c) Iron

d) Copper

10) What is the process of converting a solid directly into a gas called?

a) Evaporation

b) Condensation

c) Sublimation

d) Deposition

11) What is the main component of natural gas?

a) Methane

b) Ethane

c) Propane

d) Butane

12) What is the chemical formula for carbon dioxide?

a) CO2

b) C2O

c) CO

d) C3O2

13) What type of bond involves the sharing of electrons?

a) Ionic bond

b) Covalent bond

c) Metallic bond

d) Hydrogen bond

14) Which acid is found in vinegar?

a) Citric acid

b) Acetic acid

c) Lactic acid

d) Sulfuric acid

15) What is the chemical symbol for sodium?

a) S

b) Na

c) K

d) Ca

16) Which of the following is a strong acid?

a) Hydrochloric acid

b) Acetic acid

c) Citric acid

d) Carbonic acid

17) What is the molar mass of water (H2O)?

a) 16 g/mol

b) 18 g/mol

c) 20 g/mol

d) 22 g/mol

18) What is the term for a solution that has more solute than it can dissolve?

a) Saturated

b) Unsaturated

c) Supersaturated

d) Concentrated

19) What is the primary element in organic compounds?

a) Carbon

b) Hydrogen

c) Oxygen

d) Nitrogen

20) Which of the following is an example of a base?

a) NaCl

b) NaOH

c) HCl

d) H2SO4

21) What is the term for the amount of matter in an object?

a) Weight

b) Mass

c) Density

d) Volume

22) Which gas is known as the 'greenhouse gas'?

a) Nitrogen

b) Oxygen

c) Carbon dioxide

d) Helium

23) What is the name of the process where a gas turns into a liquid?

a) Evaporation

b) Condensation

c) Sublimation

d) Freezing

24) What is the formula for calculating density?

a) mass/volume

b) volume/mass

c) mass × volume

d) mass + volume

25) What is the main product of combustion of hydrocarbons?

a) Oxygen

b) Water

c) Carbon dioxide

d) Nitrogen

26) Which element has the highest electronegativity?

a) Fluorine

b) Oxygen

c) Chlorine

d) Nitrogen

27) What is the process of separating a mixture based on boiling points called?

a) Filtration

b) Distillation

c) Evaporation

d) Sublimation

28) What is the common name for sodium bicarbonate?

a) Baking soda

b) Baking powder

c) Table salt

d) Vinegar

29) Which of the following is a non-metal?

a) Iron

b) Aluminum

c) Chlorine

d) Copper

30) What is the chemical symbol for potassium?

a) P

b) K

c) Ca

d) Na

31) What is the main gas released by volcanoes?

a) Carbon dioxide

b) Nitrogen

c) Sulfur dioxide

d) Oxygen

32) What is the chemical formula for glucose?

a) C6H12O6

b) C12H22O11

c) C6H6

d) C2H5OH

33) What is the unit of measure for the amount of substance?

a) Mole

b) Liter

c) Gram

d) Joule

34) Which of the following is a common indicator of pH?

a) Methyl orange

b) Iodine

c) Phenolphthalein

d) Both A and C

35) What is the boiling point of water in Celsius?

a) 0°C

b) 50°C

c) 100°C

d) 150°C

36) Which metal is liquid at room temperature?

a) Mercury

b) Aluminum

c) Gold

d) Silver

37) What is the chemical name for the compound with the formula NH3?

a) Ammonia

b) Hydrazine

c) Nitric acid

d) Urea

38) Which of the following is a characteristic of acids?

a) Bitter taste

b) Sour taste

c) Slippery feel

d) None of the above

39) What is the primary function of a catalyst in a chemical reaction?

a) Speed up the reaction

b) Slow down the reaction

c) Change the products

d) Increase temperature

40) What is the term for a reaction that absorbs heat?

a) Exothermic

b) Endothermic

c) Combustion

d) Synthesis

41) What is the chemical formula for sulfuric acid?

a) H2SO4

b) HCl

c) HNO3

d) H3PO4

42) What is the main purpose of a buffer solution?

a) Increase acidity

b) Maintain pH

c) Enhance reactivity

d) Decrease temperature

43) Which of the following is a diatomic molecule?

a) O2

b) H2O

c) CO2

d) CH4

44) What is the process by which plants convert sunlight into chemical energy called?

a) Respiration

b) Photosynthesis

c) Combustion

d) Transpiration

45) Which type of reaction involves the exchange of ions between two compounds?

a) Synthesis

b) Decomposition

c) Single displacement

d) Double displacement

46) What is the primary function of lipids in the body?

a) Energy storage

b) Structural support

c) Transport

d) All of the above

47) What is the chemical formula for sodium sulfate?

a) Na2SO4

b) NaSO4

c) Na2S

d) Na2O

48) What is the term for the solid that forms from a solution during a chemical reaction?

a) Precipitate

b) Solvent

c) Solute

d) Dilute

49) Which of the following is a property of metals?

a) Brittle

b) Good conductors of heat

c) Insulators

d) Dull appearance

50) What is the term for the negative electrode in an electrochemical cell?

a) Anode

b) Cathode

c) Electrolyte

d) Separator

Total Questions: 100

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