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प्रश्न
Select the correct answer for the following options:
The gas obtained when potassium chlorate is heated in the presence of a catalyst.
पर्याय
Hydrogen
Copper [II] oxide
Oxygen
Copper [II] hydroxide
Ammonia
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उत्तर
Oxygen
APPEARS IN
संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Give reason .
A person suffering from acidity is advised to take an antacid.
FILL IN THE BLANK
Positively charged ions are called ........
What are biocatalysts ?
Fill in the blank
A new substance is always formed in a _______ change.
Write true or false :
Hydrogen sulphide has rotten egg smell .
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
What is a chemical change? Give two examples of chemical change?
Complete and balance the following reaction:
Pb(NO3)2 + KI →
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
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.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
What is the role of a catalyst in a chemical reaction?
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Write a note on the following:
Fermentation
