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प्रश्न
Explain the following reaction with one suitable example of Double decomposition reaction.
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उत्तर
Double decomposition reaction : In this reaction two compounds in solution state react with each other to form two new substances by exchanging their radicals, e.g. Reaction of sodium hydroxide with dilute hydrochloric acid.
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संबंधित प्रश्न
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
What is a chemical reaction?
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
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 white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
Galvanization is a process in which ______ is coated as a layer of iron.
Photosynthesis is a chemical charge. Justify your answer.
______ is the chemical name of slaked lime.
Acid rain is a result of ______.
