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प्रश्न
Write true or false :
Hydrogen sulphide has rotten egg smell .
विकल्प
True
False
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उत्तर
True
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
Give reason .
A person suffering from acidity is advised to take an antacid.
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
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.
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 spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
What is a chemical reaction?
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Give a word equation for the following reaction.
A compound which on heating shows – colour change from brown to yellow.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Which of the following is a chemical change?
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
