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प्रश्न
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.
उत्तर
Copper nitrate Cu[NO3]2.
APPEARS IN
संबंधित प्रश्न
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
TRUE \ FALSE
Electrolytic refining is a method in which a thin coating of a metal is done over another metal.
Write true or false :
No new substance is formed during a chemical reaction.
Balancing a chemical equation is based on
Copper carbonate when heated, it turns :
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
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)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
State the conditions necessary for a chemical change or reaction.
Give an example of the following chemical change.
A reaction where colour change is noticed
Explain,giving one example of the following chemical changes:
Reversible reaction
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
What happens when cane sugar is strongly heated? Mention any two changes in it.
_____ is the basic material to manufacture urea.
Burning of paper is the best example of ______ change.
Write some materials prepared by chemical changes.
A chemical change may involve –
What is thermochemical reactions?
Define the following term:
Chemical change
