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प्रश्न
Name: Two carbonates do not produce carbon dioxide on heating.
उत्तर
Na2CO3 and K2CO3
APPEARS IN
संबंधित प्रश्न
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
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
How is precipitate formation in a chemical reaction indicated?
Is kerosene an electrolyte or a non-electrolyte ?
Define chemical reaction.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
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)
Oxygen is a ______ in respiration.
Give an example of a reaction where the following are involved:
Solution
Define Photochemical reaction
Give an example
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
Name the gases which Turn moist red litmus blue.
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
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.
