Two metals X and Y form the salts XSO 4 and Y 2 SO 4 , respectively. The solution of salt XSO 4 is blue in colour whereas that of Y 2 SO 4 is colourless. When barium chloride solution is added to XSO 4 solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to Y 2 SO 4 solution, then the same white precipitate Z is formed along with colourless common salt solution. (a) What could the metals X and Y be? (b) Write the name and formula of salt XSO 4 . (c) Write the name and formula of salt Y 2 SO 4 . (d) What is the name and formula of white precipitate Z? (e) Write the name and formula of the salt which turns the solution green in the first case.

(a) Metal "X" is copper Cu and Metal " Y" is sodium ( Na ) . (b) The name of the salt is copper sulphate. Its formula is CuSO 4 . (c) The name of the salt is Sodium sulphate. Its formula is Na 2 SO 4 . (d) The white precipitate compound " Z "is barium sulphate. Its formula is BaSO 4 . (e) The salt which turns the solution green is copper chloride. Its formula is CuCl 2 .

A red-brown metal X forms a salt XSO 4 . When hydrogen sulphide gas is passed through an aqueous solution of XSO 4, then a black precipitate of XS is formed along with sulphuric acid solution. (a) What could the salt XSO 4 be? (b) What is the colour of salt XSO 4 ? (c) Name the black precipitate XS. (d) By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution. (e) What type of chemical reaction takes place in this case?

(a) Copper sulphate is the salt with formula CuSO 4 . (b) The colour of salt XSO 4 is blue. (c) Copper sulphide is the black precipitate XS . (d) When hydrogen sulphide gas is passed through the aqueous solution of copper sulphate then a black precipitate of copper sulphide is formed along with sulphuric acid solution. The chemical equation for the reaction is: H 2 S g + CuSO 4 aq → CuS s + H 2 SO 4 aq Hydrogen Copper Copper Sulphuric acid sulphide sulphate sulpdide (e) Double displacement is the type of reaction that takes place in this case.

A metal salt MX when exposed to light splits up to form metal M and a gas X 2 . Metal M is used in making ornaments whereas gas X 2 is used in making bleaching powder. The salt MX is itself used in black and white photography. (a) What do you think metal M is? (b) What could be gas X 2 ? (c) Name the metal salt MX. (d) Name any two salt solutions which on mixing together can produce a precipitate of salt MX. (e) What type of chemical reaction takes place when salt MX is exposed to light? Write the equation of the reaction.

(a) Silver is the metal "M". It appears greyish, used in jewellery. (b) Chlorine is the gas X 2 . It is halogen gas used to prepare bleaching powder. (c) Silver chloride is the metal salt " MX ". (d) Silver nitrate and sodium chloride can produce metal salt - silver chloride. (e) Decomposition reaction by light takes place when silver chloride is exposed to light. The chemical equation is, 2 AgCl s → Decomposition Light 2 Ag s + Cl 2 g Silver Silver Chlorine chloride

HARD

10th CBSE

IMPORTANT

Earn 100

A strip of metal X is dipped in a blue coloured salt solution YSO₄. After some time, a layer of metal from the salt solution is formed on the surface of metal strip. Metal x is used in galvanisation whereas metal y is used in making electric wires. Metal X and metal Y together form an alloy z.
(a) What could metal X be?
(b) What could metal Y be?
(c) Name the metal salt YSO₄.
(d) What type of chemical reaction takes place when metal X reacts with salt solution YSO₄?
Write the equation of the chemical reaction involved.
(e) Name the alloy Z.

Important Questions on Chemical Reactions And Equations

HARD

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 1 - Chemical Reactions And Equations>Questions Based on High Order Thinking Skills (HOTS)>Q 62

When a black metal compound XO is heated with a colourless gas Y₂, then metal X and another compound Y₂O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y₂can be prepared by the action of a dilute acid on any active metal. The compound Y₂O is a liquid at room temperature which can turn anhydrous copper sulphate blue.
(a) What do you think is metal X?
(b) What could be gas Y₂?
(c) What is compound XO?
(d) What is compound Y₂O?
(e) Write the chemical equation of the reaction which takes place on heating XO with Y₂.
(f) What type of chemical reaction is illustrated in the above equation?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 1 - Chemical Reactions And Equations>Questions Based on High Order Thinking Skills (HOTS)>Q 63

A metal X forms a water soluble salt XNO₃. When an aqueous solution of XNO₃ is added to common salt solution, then a white precipitate of compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrochloric acid.
(a) What is metal X?
(b) What is salt XNO₃?
(c) Name the compound Y.
(d) Write the chemical equation of the reaction which takes place on reacting XNO₃ solution and common salt solution giving the physical states of all the reactants and products.
(e) What type of chemical reaction is illustrated by the above equation?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 1 - Chemical Reactions And Equations>Questions Based on High Order Thinking Skills (HOTS)>Q 64

Two metals X and Y form the salts XSO₄and Y₂SO₄, respectively. The solution of salt XSO₄is blue in colour whereas that of Y₂SO₄is colourless. When barium chloride solution is added to XSO₄solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to Y₂SO₄solution, then the same white precipitate Z is formed along with colourless common salt solution.
(a) What could the metals X and Y be?
(b) Write the name and formula of salt XSO₄.
(c) Write the name and formula of salt Y₂SO₄.
(d) What is the name and formula of white precipitate Z?
(e) Write the name and formula of the salt which turns the solution green in the first case.

HARD

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 1 - Chemical Reactions And Equations>Questions Based on High Order Thinking Skills (HOTS)>Q 65

A red-brown metal X forms a salt XSO₄. When hydrogen sulphide gas is passed through an aqueous solution of XSO_4, then a black precipitate of XS is formed along with sulphuric acid solution.
(a) What could the salt XSO₄be?
(b) What is the colour of salt XSO₄?
(c) Name the black precipitate XS.
(d) By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.
(e) What type of chemical reaction takes place in this case?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 1 - Chemical Reactions And Equations>Questions Based on High Order Thinking Skills (HOTS)>Q 66

When a strip of red-brown metal X is placed in a colourless salt solution YNO₃then metal Y is set free and a blue coloured salt solution X(NO₃)₂is formed. The liberated metal forms a shining white deposit on the strip of metal X.
(a) What do you think metal X is?
(b) Name the salt YNO₃.
(c) What could be metal Y?
(d) Name the salt X(NO₃)₂.
(e) What type of reaction takes place between metal X and salt solution YNO₃?

HARD

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 1 - Chemical Reactions And Equations>Questions Based on High Order Thinking Skills (HOTS)>Q 67

A metal salt MX when exposed to light splits up to form metal M and a gas X₂. Metal M is used in making ornaments whereas gas X₂ is used in making bleaching powder. The salt MX is itself used in black and white photography.
(a) What do you think metal M is?
(b) What could be gas X₂?
(c) Name the metal salt MX.
(d) Name any two salt solutions which on mixing together can produce a precipitate of salt MX.
(e) What type of chemical reaction takes place when salt MX is exposed to light? Write the equation of the reaction.

Important Questions on Chemical Reactions And Equations

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