GRADE 10 CHEMISTRY

A solution of substance ‘X’ is used for white washing. What is the substance ‘X’?

• calcium oxide (CaO)

• calcium hydroxide (CaOH2)

• calcium carbonate(CaCO3)

• calcium chloride (Cacl2)

Fe2O3 + 3CO ⟶ 2Fe + 3CO2, The oxidizing agent is

• Fe

• CO

• Fe2O3

• CO2

A solution of a substance ‘X’ is used for testing carbon dioxide. What will be the reaction of ‘X’ with carbon dioxide?

• calciumcarbonate

• Quick lime

• Slaked lime

• Calcium bicarbonate

Respiration is an example for which type of chemical reaction?

• Decomposition

• combination

• Displacement

• Double displacement

Which of the following statements is correct according to the given equation 3MnO2 + 4Al ⟶ 3Mn + 2Al2O3

• MnO2 is oxidised

• Al has been reduced

• MnO2 is reduced

• 2Al2O3 has been reduced

2g of ferrous sulphate crystals are heated in a dry boiling tube

Which among these is an observation for this reaction?

• Green colour of Fe SO₄ disappears

• Red ppt is formed

• Reddish brown solid is formed

• A green colour is formed

The reaction of silver bromide in sunlight is an example for

• Photolysis

• Thermal decomposition

• Displacement

• Double displaceemnt

Some crystals of copper sulphate is were dissolved in water. The colour of the solution formed will be

• Green

• Red

• Blue

• Brown

Identify the products formed when 1 mL of dil. Hydrochloric acid is added to 1g of Sodium metal ?

• NaCl is formed

• NaCl and water is formed

• Sodium Chloride & Hydrogen Will be formed

• None of these

Which of the following reactions is/ are an endothermic reaction(s) where decomposition also happens?

• Respiration

• Heating of lead nitrate

• Decomposition of organic matter

• Electrolysis of acidified water