Chemistry : General knowledge questions and answers

Chemistry : General knowledge questions and answers

1. Horizontal rows in the periodic table are called ___________

a. Groups
b. Group 14
c. Periods
d. Period 14

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2. In Periodic table vertical columns are called ________________

a. Groups
b. Periods
c. Group 14
d. Period 14

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3. Alkali metals belong to which group in periodic table?

a. Group 0
b. Group 2
c. Group 3
d. Group 1

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4. What are reactive metals called?

a. Noble gases
b. Alkali metals
c. Alkanes
d. Polymers

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5. Unreactive non metals are called___________

a. Alkanes
b. Alkali metals
c. Polymers
d. Noble gases

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6. Group 0 elements are ____________

a. Unreactive non metals
b. Reactive non metals
c. Reactive metals
d. Unreactive metals

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7. What does Nucleus consist of?

a. Protons and Neutrons
b. Protons and Electrons
c. Neutrons
d. Protons

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8. Which of the following is correct?

a. Protons and Neutrons are electrically charged
b. Protons and Electrons are electrically charged
c. Electrons and Neutrons are electrically charged
d. Neutrons, Electrons and Protons are electrically charged

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9. What is the relative charge of Proton and Electron?

a. -1, +1
b. +1, -1
c. +2, -2
d. -2, +1

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10. The number of ____________ is equal to number of __________ in its nucleus.

a. Protons, Electrons
b. Electrons, Neutrons
c. Protons, Neutrons
d. Electrons, Protons

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11. What is atomic number of an atom?

a. Number of protons
b. Number of neutrons
c. Number of electrons
d. Total number of protons and neutrons

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12. What is the mass number of an atom?

a. Total number of protons and electrons
b. Total number of electrons and protons
c. Total number of protons and neutrons
d. None of the above

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13. The lowest energy level fills with ____________ first.

a. Electrons
b. Protons
c. Neutrons
d. Electrons and Protons

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14. What is the maximum number of electrons the second energy level can hold?

a. 6
b. 8
c. 4
d. 2

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15. Ions are charged particles that form when atoms ___________________

a. Lose or gains protons
b. Lose or gains electrons
c. Lose or gains neutrons
d. None of the above

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16. What do metal atoms lose to form positively charged ions?

a. Electrons
b. Neutrons
c. Protons
d. All of the above

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17. What do non metal atoms lose to form negatively charged ions?

a. Protons
b. Neutrons
c. Electrons
d. Protons and Neutrons

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18. The atoms in a molecule are joined together by _____________

a. Covalent bond
b. Ionic bond
c. Single bond
d. Double bond

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19. After any chemical reaction __________________

a. Total mass of products is same as the total mass of the reactants
b. Total mass of products is less than the total mass of the reactants
c. Total mass of products is more than the total mass of the reactants
d. None of the above

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20. Reactive metals are extracted by ______________

a. Carbon
b. Carbon monoxide
c. Emulsion
d. Electrolysis

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21. What is the general formula of Alkanes?

a. No. of hydrogen atoms is triple the no. of carbon atom plus two
b. No. of hydrogen atoms is double the no. of carbon atom plus two
c. No. of hydrogen atoms is double the no. of carbon atom
d. No. of hydrogen atoms is double the no. of carbon atom plus four

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22. Alkanes are ______________________

a. Unsaturated Hydrocarbons
b. Saturated Hydrocarbons
c. Polymer
d. Monomers

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23. Which one of the following is correct?

a. Unsaturated oils tend to be solid at room temperature
b. Saturated oils tend to be liquid at room temperature
c. Saturated oils tend to be solid at room temperature
d. None of the above

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24. Polyunsaturated fats have _______________

a. Many double bonds
b. Many single bonds
c. One single bond
d. One double bond

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25. Which of the following is used to freeze food?

a. Hydrogen
b. Liquid Hydrogen
c. Liquid Nitrogen
d. Nitrogen

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26. The pH level is lower if ______________________

a. Concentration of hydrogen ions is greater
b. Concentration of hydrogen ions is lower
c. Concentration of nitrogen ions is greater
d. Concentration of nitrogen ions is lower

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27. All acids contain _____

a. H-
b. H+
c. N+
d. N-

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28. Which is strongly acidic (0) on pH scale among the following?

a. Stomach acid
b. Battery acid
c. Lemon juice
d. Vinegar

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29. Which of the following is strongly alkaline (13) on pH scale?

a. Bleach
b. Soapy water
c. Ammonia
d. Sea water

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30. Alkalis are ______________________________

a. Bases that are insoluble in water
b. Acids that are soluble in water
c. Acids that are insoluble in water
d. Bases that are soluble in water

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