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प्रश्न
Fill in the blank:
The substances which undergo chemical change are called _______
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उत्तर
The substances which undergo chemical change are called reactants .
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संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Define electrolysis.
Write true or false :
When potassium iodide solution is added to lead acetate solution a red precipitate is formed.
Write true or false .
A black residue is formed when sugar is heated .
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
Give an example of a reaction where the following are involved:
Solution
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
What is observed in performing the following :
| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
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 white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
