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प्रश्न
Write true or false :
Hydrogen sulphide has rotten egg smell .
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Is kerosene an electrolyte or a non-electrolyte ?
Fill in the blank
A new substance is formed in a _______ change.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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)
Oxygen is a ______ in respiration.
State the conditions necessary for a chemical change or reaction.
Give an example of a reaction where the following are involved
Light
Give an example of the following chemical change.
A reaction where colour change is noticed
What do you observe when HCI is passed through a silver nitrate solution.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
What do you observe when CO2 is passed through lime water first and then a little in excess.
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 on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Explain the term chemical reaction with special reference to reactants and products.
The percentage composition of Nitrogen in Ureas is ______.
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.
When magnesium is burnt in the air, a new substance is formed which is ______.
Acid rain is a result of ______.
What is the difference between reactants and products?
