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Questions and Answers
Which element has the highest electronegativity?
Which element has the highest electronegativity?
How many valence electrons does a chlorine (Cl) atom have?
How many valence electrons does a chlorine (Cl) atom have?
Where does photosynthesis primarily take place?
Where does photosynthesis primarily take place?
What is the function of auxins in plants?
What is the function of auxins in plants?
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In sexual reproduction, where do offspring inherit genes from?
In sexual reproduction, where do offspring inherit genes from?
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Which system in the human body is responsible for removing waste products through the kidneys?
Which system in the human body is responsible for removing waste products through the kidneys?
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Which of the following is an example of a chemical change?
Which of the following is an example of a chemical change?
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The balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid is:
The balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid is:
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Which of the following has a pH value less than 7?
Which of the following has a pH value less than 7?
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An example of a metal is:
An example of a metal is:
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What is the main difference between metals and non-metals?
What is the main difference between metals and non-metals?
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Diamond is:
Diamond is:
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Study Notes
Periodic Table and Chemical Properties
- Fluorine (F) has the highest electronegativity.
- Chlorine (Cl) atom has 7 valence electrons.
Photosynthesis
- Photosynthesis primarily takes place in chloroplasts.
Plant Hormones
- Auxins function to promote cell elongation and cell growth in plants.
Sexual Reproduction
- Offspring inherit genes from parents.
Human Body Systems
- Excretory system is responsible for removing waste products through the kidneys.
Chemical Reactions
- Burning of gasoline is an example of a chemical change.
Chemical Equations
- The balanced chemical equation for the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is: NaOH + HCl → NaCl + H₂O.
Acids and Bases
- Substances with a pH value less than 7 are acidic.
Metals and Non-Metals
- An example of a metal is sodium (Na).
- The main difference between metals and non-metals is the ability to conduct electricity.
Carbon Allotropes
- Diamond is an allotrope of carbon that is a non-conductor and extremely hard.
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Description
Test your knowledge with 20 multiple-choice questions based on key concepts covered in Chapter 1 - Chemical Reactions and Equations of NCERT Class 10 Science textbook. Questions cover topics such as chemical changes, balanced chemical equations, and more.
