Class 10 Science 150 Question

1.    Write a balanced chemical equation with state symbols for the following reactions.
a.     Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
b.  Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
2.    Explain the Oxidation and Reduction?
3.    What is the Corrosion?
4.    Explain the Double Displacement Reaction and Decomposition Reaction with example?
5.    Write the balanced chemical equation for the following and identify the type of reaction in each case.
a.  Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
b.  Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
c.  Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
d.  Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)
6.    What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
a.     Hydrogen gas and iron chloride are produced.
b.    Chlorine gas and iron hydroxide are produced.
c.     No reaction takes place.
d.    Iron salt and water are produced.
7.    Any three difference between acids and bases?
8.    Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
9.    Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
10.                       Why does an aqueous solution of an acid conduct electricity?
11.                       What effect does the concentration of H⁺(aq) ions have on the nature of the solution?
12.                       Write down Uses of sodium hydrogen carbonate (NaHCO₃)
13.                       Write down make process of Plaster of Paris (POP).
14.                       Write an equation to show the reaction between Plaster of Paris and water.
15.                       Why does distilled water not conduct electricity, whereas rain water does?
16.                       What is a neutralisation reaction? Give two examples.
17.                       Explain the meanings of malleable and ductile.
18.                       Why is sodium kept immersed in kerosene oil?
19.                       Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
20.                       Write the electron-dot structures for sodium, oxygen and magnesium.
21.                       Name two metals which are found in nature in the free state.
22.                       Which metals do not corrode easily?
23.                       What are alloys?
24.                       What are amphoteric oxides? Give two examples of amphoteric oxides.
25.                       Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
26.                       Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
27.                       What would be the electron dot structure of carbon dioxide which has the formula CO₂?
28.                       How many structural isomers can you draw for pentane?
29.                       What will be the formula and electron dot structure of cyclopentane?
30.                       A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
 

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