10th Class Science: Chemical Reactions Activities

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Questions and Answers

What is formed when white lead nitrate reacts with white potassium iodide?

Yellow lead iodide (correct)

Green ferrous sulfate

Zinc sulfate

Hydrogen gas

What characterizes a precipitation reaction?

Formation of a semi-soluble salt (correct)

Absorption of heat

Formation of a gaseous product

Formation of a soluble salt

Why is it recommended to use dilute acids in reactions?

Concentrated acids do not react with metals

They are more effective for reactions

Dilute acids increase reaction times

Higher concentrations can cause dangerous exothermic reactions (correct)

What gas is produced when zinc granules are added to dilute sulfuric acid?

Hydrogen gas Signup and view all the answers

What color does silver chloride turn when exposed to sunlight?

Greyish white Signup and view all the answers

What happens to the temperature of the system when zinc reacts with dilute sulfuric acid?

It increases Signup and view all the answers

What color are ferrous sulfate crystals originally?

Green Signup and view all the answers

What residual product is formed when lead nitrate is heated?

Lead oxide Signup and view all the answers

What is formed when zinc granules react with dilute sulfuric acid?

Zinc sulfate Signup and view all the answers

What happens to the blue color of copper sulfate solution after placing an iron nail in it?

Turns green Signup and view all the answers

What visual observation confirms the presence of hydrogen gas during the zinc and sulfuric acid reaction?

It burns with a pop sound Signup and view all the answers

Why is silver chloride stored in a black bottle?

To prevent photodecomposition Signup and view all the answers

What is the main characteristic of nitrogen dioxide released from lead nitrate upon heating?

It turns blue litmus red Signup and view all the answers

What color will the iron nail take on after being immersed in copper sulfate solution?

Brownish Signup and view all the answers

What occurs when ferrous sulfate crystals are heated?

They become dirty white and then brown Signup and view all the answers

Which gas is primarily produced during the heating of lead nitrate?

Nitrogen dioxide Signup and view all the answers

What happens to the color of the copper sulfate solution when iron nails are placed in it?

It turns light green Signup and view all the answers

What type of reaction occurs when iron displaces copper from copper sulfate?

Metal displacement reaction Signup and view all the answers

What is observed immediately when barium chloride is mixed with sodium sulfate?

A white precipitate forms Signup and view all the answers

What will happen to the white precipitate formed from the mixing of barium chloride and sodium sulfate after some time?

It will settle down at the bottom of the tube Signup and view all the answers

What is the black substance formed when copper powder is heated?

Copper oxide Signup and view all the answers

How can the black copper oxide be converted back to reddish brown copper?

By passing hydrogen gas over it Signup and view all the answers

What is the final product when iron displaces copper from copper sulfate?

FeSO4 Signup and view all the answers

What color does the solution of barium sulfate become after the precipitate settles?

Colorless Signup and view all the answers

What is the black substance formed from the oxidation of copper?

Copper Oxide Signup and view all the answers

What gas is produced when zinc granules react with dilute sulphuric acid?

Hydrogen Signup and view all the answers

What happens to lime water when it is bubbled with carbon dioxide?

Turns milky Signup and view all the answers

What is one main observation when powdered sodium hydrogen carbonate reacts with ethanoic acid?

Brisk effervescence Signup and view all the answers

What occurs to the color of copper sulfate when heated?

Turns white Signup and view all the answers

What indicates the presence of hydrogen gas during the test?

A pop sound when ignited Signup and view all the answers

When sodium carbonate reacts with dilute hydrochloric acid, what gas is produced?

Carbon Dioxide Signup and view all the answers

What happens when water is added back to the white copper sulfate after heating?

It turns blue again Signup and view all the answers

What do most non-metals produce when dissolved in water?

Acidic oxides Signup and view all the answers

Which metal reacts most vigorously with dilute hydrochloric acid?

Magnesium Signup and view all the answers

In which test tube did a reaction occur when a clean iron nail was placed in copper sulfate?

Test tube containing copper sulfate Signup and view all the answers

What indicates that a reaction has occurred when the blue CuSO4 solution turns green?

Fading of blue color Signup and view all the answers

What is required for iron to rust?

Both air and moisture Signup and view all the answers

What happens to potassium permanganate's color when alcohol is consumed in a reaction?

Color disappears initially Signup and view all the answers

Which metal is less reactive than magnesium, aluminum, and zinc in reactions with dilute acids?

Copper Signup and view all the answers

Which statement accurately describes displacement reactions?

Reactive metals displace less reactive metals Signup and view all the answers

What causes the formation of scum when washing with soap in hard water?

Reaction of soap with calcium and magnesium salts Signup and view all the answers

Which type of water produces more foam when using soap?

Distilled water Signup and view all the answers

What do the green areas of a variegated leaf indicate when tested with iodine?

Presence of starch Signup and view all the answers

What happens to a green leaf after being immersed in boiling alcohol during the starch test?

It becomes colorless Signup and view all the answers

In an experiment demonstrating starch presence in a leaf, what does the color change to after iodine is applied to the green areas?

Dark blue Signup and view all the answers

What is the primary purpose of using detergents instead of soap in hard water?

To produce more foam and avoid scum Signup and view all the answers

Which of the following statements about the effect of light on chlorophyll is accurate?

Chlorophyll loses color in the dark Signup and view all the answers

Which of the following statements is true about the composition of the leaf after the experiment?

The non-green areas contain no starch Signup and view all the answers

Study Notes

Class 10th Science Activities and Questions

Activities cover various scientific concepts, including chemical reactions and observations.
Activities often involve specific materials and procedures.
Safety precautions are highlighted, advising on the need for teacher assistance and eye protection in certain cases.
Activities often require careful observation and recording of observations.
Various chemical reactions and their properties are explored, including precipitation, combustion, and decomposition reactions.
Activities include using various lab equipment (e.g., test tubes, watch glasses, boiling tubes, beakers, burner, etc.)
Different chemical substances used in activities include magnesium ribbon, lead nitrate, potassium iodide, sodium carbonate, barium chloride, copper powder, etc.
Some experiments involve heating and using different solutions to observe changes in color, formation of precipitates, or production of gases.
Note the importance of controlling variables and making accurate observations when performing experiments.
Several questions, related to different activities and observations, encourage critical thinking.
Different experiments are used to highlight the importance of using dilute acids due to safety and efficient reaction
Activities explain the conditions required for certain chemical reactions and specific observations, e.g., the importance of cleaning the magnesium ribbon before burning it in air
Chemical equations are used to represent the reactions observed during the experiments.
Different experiments are used to explain the formation of oxides (copper oxide. ferrous oxide, etc.) and describe the reaction type.
Discussion of different phenomena like oxidation or chemical reactions and their practical implications is included.
Emphasis on proper lab techniques and safety procedures.
Notes on different chemical reactions, including those related to the production of different substances such as different metal oxides, which describe a reaction.
Some explanations on relevant concepts, like the chemical reactions and properties of acids and bases.
Activities and questions are part of a larger scientific investigation process to observe and record the outcomes

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Description

This quiz covers various activities and questions related to chemical reactions in 10th class science. Students will explore key concepts such as precipitation, combustion, and decomposition reactions while emphasizing the importance of safety measures and careful observation. Ideal for reinforcing understanding of practical lab techniques and material properties.