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A Coloured Substance Which Leaves a Black Residue and Evolves Two Gases One of Which is Acidic and Coloured and the Other Neutral and Colourless.

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Question

On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A coloured substance which leaves a black residue and evolves two gases one of which is acidic and coloured and the other neutral and colourless.

One Line Answer
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Solution

Copper nitrate Cu[NO3]2.

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Chapter 9: Practical Chemistry - Additional Questions

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Viraf J. Dalal Simplified ICSE Chemistry [English] Class 9
Chapter 9 Practical Chemistry
Additional Questions | Q 2.5

RELATED QUESTIONS

MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Reduction is a chemical reaction in which there is

  1. removal of hydrogen
  2. removal of oxygen
  3. addition of oxygen
  4. none of these

                                    MATCH THE COLUMNS

1 . `H_2` + `CI_2` `→` 2HCI    a. displacement reaction
2. `2FeCI_3`+ `H_2`  `→` `2FeCI_2` +2HCI` b. addition of an electronegative redical 
3. Fe + `CuSO_4` `→``FeSO_4` +Cu`  c. removal of an electronegative redical 
4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` d.reduction by adding hydrogen
5. 3Fe +`3CI_2` `→` `2FeCI_3` e.electrolysis of water
6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI F.double decomposition,precipitation reaction
7.`2H_2O` `→` `2H_2``↑`+`O_2` e. combination or synthesis reaction

 


Name the type of chemical reaction shown by the following equation:

NaOH + HCl → NaCl + H2O


Give a word equation for the following reaction.

A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Addition of water to quicklime.


Circle the odd one out. Give reason for your choice


Match the following:

1. Sodium Chloride a. CaSO41/2H2O
2. Calcium sulphate dihydrate b. C2H5Oh
3. Magnesium sulphate hydrate c. CaSO4.2H2O
4. Calcium sulphate hemihydrate d. NaCl
5. Phenol e. MgSO4.H2O

Arrange the following statements in correct sequence:

  1. One side is water-loving and other water-hating molecules.
  2. When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
  3. The dirt surrounded by the detergent molecules floats in the water making it dirty.
  4. Finally, the cloth is clean.
  5. The detergent molecules have two sides.
  6. Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.

Give an example of a chemical reaction for the following situation:

A change in colour is observed


Magnesium + oxygen → magnesium oxide.

2Mg + O2 → 2Mg O


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