NCERT Class 10 Science Quiz: Chemical Reactions and Equations
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Questions and Answers

Which element has the highest electronegativity?

  • Sodium
  • Chlorine
  • Fluorine (correct)
  • Oxygen

How many valence electrons does a chlorine (Cl) atom have?

  • 1
  • 18
  • 7
  • 17 (correct)

Where does photosynthesis primarily take place?

  • Roots
  • Flowers
  • Leaves (correct)
  • Stems

What is the function of auxins in plants?

<p>Stem elongation (D)</p> Signup and view all the answers

In sexual reproduction, where do offspring inherit genes from?

<p>Both parents (C)</p> Signup and view all the answers

Which system in the human body is responsible for removing waste products through the kidneys?

<p>Kidneys (C)</p> Signup and view all the answers

Which of the following is an example of a chemical change?

<p>Rusting of iron (D)</p> Signup and view all the answers

The balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid is:

<p>NaOH + HCl → NaCl + H2O (C)</p> Signup and view all the answers

Which of the following has a pH value less than 7?

<p>Bleach (A)</p> Signup and view all the answers

An example of a metal is:

<p>Mercury (C)</p> Signup and view all the answers

What is the main difference between metals and non-metals?

<p>Metals can conduct electricity, while non-metals cannot. (B)</p> Signup and view all the answers

Diamond is:

<p>An allotrope of carbon (B)</p> Signup and view all the answers

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 + Hâ‚‚O.

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.

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