Make 15 questions whose answer come in one sentence from science 2 chapter 3rd class 10th stateboard please dont copy from digest or master key make on your own but reliable and important points considering quuestions. Only SSC 10th class students answer this make the questions from text. Please answer correctly
Answers
Answer:
Q1. Which gas is usually liberated when an acid reacts with a metal?
Answer
Hydrogen gas.
Q2. Name a salt which does not contain water of crystallisation.
Answer
Baking soda.
Q3. Write an equation to show the reaction between Plaster of Paris and water.
Answer
CaSO4. ½H2O +1½ H2O → CaSO4.2H2O
Plaster of Paris: CaSO4. ½H2O
Gypsum: CaSO4.2H2O
Q4. What would be the colour of litmus in a solution of sodium carbonate?
Answer
The colour of litmus in a solution of sodium carbonate is blue.
Q5. Name the sodium compound which is used for softening hard water.
Answer
Sodium carbonate.
Q6. Classify the following into acidic oxides anc basic oxides : Na2O, SO2, MgO, CO2
Answer
Acidic oxides — SO2, CO2
Basic oxides — Na2O, MgO2
(1) Give an example of metal which is a liquid at room temperature?
(2) Give an example of a metal which can easily cut with a knife?
(3) Give an example of a metal which is the best conductor of heat?
(4) Give an example of a metal which is a poor conductor of heat?
(5) Why is sodium kept immersed in kerosene oil?
(6) Name two metals which are found in nature in the free state?
(7) Which metals do no corrode easily?
(8) What are alloys?
(9) Name one metal and a non-metal found in liquid state at room temperature?
(10) What is the formula of rust?
(11) Give composition of the alloy- ' brass' and 'bronze'?
(12) Why do ionic compounds not conduct electricity in the solid state?
(13) Write balanced chemical equation for the reaction: Aluminium when heated in air. Write the
name of the product?
(14) Name two metals which have very low melting point?
(15) Name a non-metal which is lustrous and a metal which is non-lustrous?
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