CHEMICAL REACTIONS AND EQUATIONS (STD.10TH) QUESTION BANK

CHEMICAL REACTIONS

(QUESTION BANK)

Choose the correct answer from the given options

· Classify the following into chemical combination and chemical displacement

a) NH₃ + HCl ® NH₄Cl                    b) Na₂O + CO₂ ® Na₂CO₃

c) CuSO₄ + Fe ® FeSO₄ + Cu          d) 2AgNO₃ + Cu ® 2Ag + Cu(NO₃)₂

· An example for chemical reaction for chemical displacement is

a) 2AgNO₃ + Cu ® 2Ag + Cu(NO₃)₂                       b) CaCl₂ + Na₂CO₃ ® CaCO₃ + 2NaCl

c) NH₄Cl ® HCl + NH₃                            d) NH₃ + HCl ® NH₄Cl            

· The reaction CuSO₄ + Zn ® ZnSO₄ + Cu

a)Double decomposition                             b) Displacement

c) Decomposition                                       d) Combination

· Following is an example for reducing agent

a)Potassium permanganate                         b) Potassium dichromate

c) Potassium metal                                     d) Potassium chloride

· Which of the following is chemical change

a) When copper sulphate crystals are heated, they become white

b) When lead nitrate is heated, we get reddish brown fumes

c) When ammonium chloride is dissolved in water, the solution gets cooled.

d) When ferrous sulphate crystals are heated, the color of the crystals change.

· Ca(OH)₂ + CO₂ ® CaCO₃ + H₂O, in this reaction the precipitate is

a)Ca(OH)₂                      b) CO₂  

c) CaCO₃                        d) H₂O

· The substance when heated in air producing reddish brown fumes is

a) Lead nitrate                         b) Ammonium chloride

c) Ferrous sulphate                  d) Calcium carbonate

· The oxidizing agent among the following is

a)Potassium permanganate [KMnO₄]                             b) Hydrogen gas [H₂]

c) Aluminium powder [Al]                                   d) Coke [C]

·  Ca(OH)₂ + 2HCl ® [X]Cl₂ + 2[Y], in this reaction [X] and [Y] are

a) Calcium and hydrogen                            b) calcium and water

c) Calcium and hydrochloric acid               d) calcium hydroxide and hydrogen

Answer the following

·  Suggest an experiment to show that water is a compound of hydrogen and oxygen.

·  Why lime water [Ca(OH)₂] turns milky when carbon dioxide gas is passed through it.

·  Write the balanced chemical equation of the chemical reaction taking place when ferrous sulphate is heated.

·  Name the oxidizing agent in the following

ZnO + C ® Zn + CO

·  Name the oxidizing agent and reducing agent in the following reaction

MnO₂ + 4HCl ® MnCl₂ + 2H₂O + Cl₂

·  What is Rancidity?

·  How can the rancidity of food be minimized?

·  What is the chemical composition of iron rust?

·  What are redox reactions? Explain

·  Explain chemical displacement and double displacement with an example for each.

·  Explain with suitable example oxidation and reduction.

·  What is chemical double displacement reaction? The reaction between barium chloride and sodium sulphate solution is an example for chemical double displacement reaction. How?

·  Classify the following into exothermic and endothermic reactions.

a) Combustion of methane                b) Reaction of calcium oxide

c) Photosynthesis                                       d) Oxidation of glucose with water in our body

·  Classify the following into chemical combination, decomposition, displacement and double displacement

¨Combustion of carbon in air

¨Reaction of barium chloride with sodium sulphate

¨Reaction of iron with copper sulphate solution

¨Reaction of iron with copper sulphate solution

¨Calcination of calcium carbonate

·  Explain the effect of oxidation with respect to the following in our daily life

1)    Iron                 2) Rancidity

·  Give one example for each for the following types of reaction and write the relevant balanced chemical equation.

Chemical combination

Chemical decomposition

Chemical double displacement

·  Identify the reducing and oxidizing agents in the following          

ZnO + C ® Zn + CO               MnO₂ + 4HCl ® MnCl₂ + 2H₂O + Cl₂

·  Express this word equation using symbols and formulae and balance it

Magnesium + Hydrochloric acid ® Magnesium chloride + Hydrogen

·  Write the names of elements [A] and [B]. What is the type of reaction? Which of the product is precipitate?

Na₂SO₄ + Ba[A]  ® BaSO₄ + [B]Cl

Write the balanced equation for

¨Calcium oxide is dissolved in water

¨Zinc metal with aqueous copper sulphate

¨Copper plate is immersed in silver nitrate solution

¨Silver chloride is exposed to sunlight

¨Barium chloride is added to dilute sulphuric acid

¨Hydrochloric acid is added to silver nitrate solution

Balance the following chemical equations

MnO₂ + HCl ® MnCl₂ + H₂O + Cl₂­

KClO₃ ® KCl + O₂

FeSO₄ ® Fe₂O₃ + SO₂ + SO₃

Pb(NO3)₂ ® PbO + NO₂ + O₂

Zn + HCl ® ZnCl₂ + H₂

Fe₂O₃ + Al ® Al₂O₃ + Fe

Draw a diagram of the arrangement of apparatus used to demonstrate the reaction of zinc granules with dilute sulphuric acid and testing hydrogen gas by burning and label any one part.

Give Reason

·  Silver articles become black when exposed to air for some days

·  Copper articles get green coating when exposed to moist air for some days.

·  When quick lime (calcium oxide CaO) is added to cold water, water begins to boil without heating.

·  Lime water [Ca(OH)₂] turns milky when carbon dioxide gas is passed through it. If excess of carbon dioxide is passed, milky nature disappears.

·  Potato chips packets are filled with nitrogen gas.

·  A shining copper vessel loses its lustre when exposed to air for several days.

·  Oxidation of glucose in our body cells is an example for exothermic reaction.

·  Silver chloride is used in black and white photography

reference : Zen Hot Model papers
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