Advertisements
Advertisements
प्रश्न
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?
- In beakers A and B, exothermic process has occurred.
- In beakers A and B, endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
विकल्प
(i) only
(ii) only
(i) and (iv)
(ii) and (iii)
Advertisements
उत्तर
(i) and (iv)
APPEARS IN
संबंधित प्रश्न
What is a chemical equation? Explain with the help of an example.
Balance the following equation and add state symbols:
\[\ce{Zn + HCl -> ZnCl2 + H2}\]
What is meant by a chemical reaction? Explain with the help of an example.
Give one example of a chemical reaction characterised by a change in state.
State one characteristic of the chemical reaction which takes place when quicklime is treated with water.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 +Cu
Write the answer to the following.
Explain the similarity in two events, namely adding NaOH to water and adding CaO to water.
Balance the following equation:
Pb3O4 + HCl → PbCl2 + H2O + Cl2
Write the balanced chemical equation of the following reaction.
copper + nitric acid → copper nitrate + nitric oxide + water
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of acid required.
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
Write the balanced chemical equation for this reaction.
Write word equation for the following molecular equation:
\[\ce{N2 + 3H2 ⇌[Fe - 450°C][200 atoms] 2NH3 + \triangle}\]
Word equation:
State why [+ Δ] indication is seen after NH3.
State what 200 atmospheres – indicates.
State the function of Fe in the above reaction.
Write word equation for the following molecular equation:
\[\ce{H2 [g] + Cl2 [g] ->[sunlight] 2HCl}\]
Word equation:
State which form of energy is utilised in the above chemical reaction.
Give a balanced equation for addition of iron to copper [II] sulphate solution. State the change in colour seen.
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Copper [II] sulphate to sodium hydroxide.
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
Write a balanced equation for the following word equation:
Potassium nitrate → Potassium nitrite + Oxygen
Writing a chemical reaction in brief by using chemical formulae is called as _______.
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
