CURIOUSITY QUIZ: CHEMICAL REACTIONS AND EQUATIONS

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

Test Your knowledge on 'Chemical Reactions & Equations' prepared exclusively according to the NCERT science curriculum for Class-10 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck! You can also ask any question that comes to your mind on this topic or any other topic on Science directly to Curiousity in the following email :

curiousitygroi@gmail.com

Email:

Name:

School (If Student):

Class (If Student):

Address (If not Student):

When a solution of Lime Water (Calcium hydroxide solution) is painted in our walls for whitewashing , it was initially dull in colour. However, after few days it turns milky white giving a shiny finish to the walls. This is due to the fact that :

1 point

Calcium hydroxide of lime water reacts slowly with the carbon dioxide of air to form a thin layer of calcium carbonate on the walls which is milky white in colour.

Calcium hydroxide reacts slowly with the oxygen of air to form a thin layer of calcium carbonate on the walls which is milky white in colour..

Calcium hydroxide reacts slowly with the carbon dioxide of air to form a thin layer of calcium bicarbonate on the walls which is milky white in colour.

Calcium oxide reacts slowly with the carbon dioxide of air to form a thin layer of calcium carbonate on the walls which is milky white in colour.

Clear selection

Chemical reactions in which heat is released along with the formation of products are called:

1 point

Combination Reactions

Decomposition Reactions

Exothermic Reactions

Endothermic Reactions

Clear selection

When we take some Silver Chloride (AgCl) in a China dish and keep it under sunlight for some time, it turns grey . What kind of chemical reaction is it ? The grey colour of the substance is due to the formation of :

1 point

Photochemical Combination reaction, Metallic Silver

Photochemical Decomposition reaction, Metallic Silver

Photochemical Oxidation reaction, Metallic Silver

Photochemical Reduction reaction, Metallic Silver

Clear selection

When an iron nail is dipped in a Copper sulphate solution for some time , the Iron nail is found to be coated with a brownish coating .

What substance gets deposited on the Iron surface?

How does the reaction happen ?

What kind of chemical reaction is it ?

1 point

Metallic Copper; Copper can displace Iron from its solution ; Displacement reaction.

Metallic Copper; Iron can displace Copper from its solution ; Combination reaction.

Metallic Copper; Iron can displace Copper from its solution ; Double Displacement reaction.

Metallic Copper; Iron can displace Copper from its solution ; Displacement reaction.

Clear selection

Suppose we mix a clear solution of Sodium sulphate to another clear solution of Barium chloride. The mixture immediately turns milky . This is due to the formation of :

What kind of chemical reaction is it ?

1 point

Sodium Chloride , Reduction reaction

Barium Sulphate , Combination reaction

Barium Sulphate , Displacement reaction

Barium Sulphate , Double Displacement reaction

Clear selection

The rusting of iron is an example of :

1 point

Combination reaction

Decomposition reaction

Oxidation reaction

Reduction reaction

Clear selection

A girl was having a hobby of collecting copper coins and silver coins . One day, she found to her surprise that the coins get coated with greenish and black coatings respectively. This is an example of :

1 point

Chemical Weathering (The green coating is due to the formation of Copper Carbonate and the black coating is due to the formation of Silver Sulphide.)

Chemical Erosion (The green coating is due to the formation of Copper Carbonate and the black coating is due to the formation of Silver Sulphide.)

Chemical Corrosion (The green coating is due to the formation of Copper Carbonate and the black coating is due to the formation of Silver Sulphide.)

Combination Reaction (The green coating is due to the formation of Copper Carbonate and the black coating is due to the formation of Silver Sulphide.)

Clear selection

When unsaturated fats and oils are left for some days open in air , they become rancid as their taste and smell changes. This is an example of :

1 point

Combination reaction

Decomposition reaction

Oxidation reaction

Chemical Corrosion

Clear selection

A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.

1 point

Silver (Ag) and Silver Sulphide ( AgS)

Copper (Cu) and Copper Carbonate ( CuCO3)

Copper (Cu) and Copper Oxide ( CuO)

Silver (Ag) and Silver Oxide ( Ag2O)

Clear selection

Cellular Respiration is an example of :

1 point

Combination reaction

Decomposition Reaction

Exothermic Reaction

Endothermic Reaction

Clear selection

Take about 2 g Barium hydroxide powder in a test tube. Add 1 g of Ammonium chloride powder and mix with the help of a glass rod. If you touch the bottom of the test tube with your palm, it feels cooler. This is an example of :

1 point

Exothermic reaction

Endothermic reaction

Oxidation reaction

Decomposition reaction.

Clear selection

What are the chemical names of Slaked lime and Quick lime respectively ?

1 point

Calcium Oxide and Calcium Hydroxide respectively

Calcium Hydroxide and Calcium Carbonate respectively

Calcium Carbonate and Calcium Oxide respectively

Calcium Hydroxide and Calcium Oxide respectively

Clear selection

When a piece of copper wire is placed in Iron sulphate solution, what is the chemical change we observe?

Justify your answer with reason.

1 point

Copper wire is slowly coated with a grey colour coating due to the formation of metallic Iron ( Displacement reaction takes place )

No chemical reaction takes place. ( because, a less chemically reactive element cannot displace a more reactive element from its solution.)

No chemical reaction takes place. ( because, a less chemically reactive element can displace a more reactive element from its solution.)

The green colour of Iron sulphate solution gets discharged gradually due to the displacement reaction.

Clear selection

Although Aluminum is a more chemically reactive element than Iron , Iron made objects get rusted quickly than Aluminum made utensils. Why ?

1 point

Iron reacts with the oxygen of air readily in the presence of moisture.

Aluminum , on reacting with the Oxygen of air, forms a thin layer of Aluminum nitrate over its surface that prevents it from further contact with oxygen.

Aluminum , on reacting with the Oxygen of air, forms a thin layer of Aluminum oxide over its surface that prevents it from further contact with oxygen.

Iron is more prone to chemical corrosion because of its high affinity towards the oxygen of air.

Clear selection

When lime stone (which is Calcium Carbonate) is heated , it produces Calcium Oxide which is a very useful raw material for cement industry. This is an example of :

1 point

Oxidation reaction

Combination reaction

Decomposition reaction

Displacement reaction

Clear selection

When a piece of Magnesium ribbon burns in air, it produces some white ash. What is the chemical composition of this substance?

1 point

Magnesium hydroxide

Magnesium oxide

Magnesium sulphide

Magnesium nitrate

Clear selection

How does acid rain affect the loss of lustre of the Taj mahal monument?

1 point

The acids present in the acid rain bleaches the shiny white colour of the stone in which the monument is made.

The Sulphuric acid present in acid rain reacts with the marble (calcium carbonate) producing Calcium sulfate ( Gypsum) which is slightly soluble in water

The Nitric acid present in acid rain reacts with the marble (calcium carbonate) producing Calcium nitrate which is highly soluble in water

Both the above statements are true .

Clear selection

Whenever a clear solution of Potassium chloride is treated with another clear solution of Silver nitrate, a white insoluble solid silver chloride is formed in the mixture . This is an example of :

1 point

Precipitation reaction

Decomposition reaction

Combination reaction

Displacement reaction

Clear selection

When we put a few drop of glycerol over a heap of Potassium permanganate powder, it burns like an eruptive volcano in a spectacular experiment . This is an example of :

1 point