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प्रश्न
Select the correct answer for the following options:
The black residue obtained on heating copper carbonate.
विकल्प
Hydrogen
Copper [II] oxide
Oxygen
Copper [II] hydroxide
Ammonia
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उत्तर
Copper [II] oxide
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
True or false
New substances are formed in a chemical change.
Fill in the blank:
The substances which undergo chemical change are called _______
Write true or false .
A black residue is formed when sugar is heated .
Explain the following reaction with one suitable example of Combination reactions .
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Define a photochemical reaction.
What do you understand by precipitation reaction? Explain with examples.
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
The chemical change is ______.
Chemists identify gypsum as a natural indicator.
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
______ is the chemical name of rust.
