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Published on: 25/05/2021
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Questions + Answers key
Take MCQ Science Test1.
Which of the following are combination reactions?
(i) 2KClO3 \(\overset { \Delta }{ \rightarrow } \) 2KCl + 3O2
(ii) MgO + H2O \(\rightarrow\) Mg(OH)2
(iii) 4Al + 3O2 \(\rightarrow\) 2Al2O3
(iv) Zn + FeSO4 \(\rightarrow\) ZnSO4 + Fe
(i) and (iii)
(iii) and (iv)
(ii) and (iv)
(ii) and (iii)
2.
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved temperature?
2H2(l) + O2(l) \(\rightarrow\) 2H2O(g)
2H2(g) + O2(l) \(\rightarrow\) 2H2O(l)
2H2(g) + O2(g) \(\rightarrow\) 2H2O(l)
2H2(g) + O2(g) \(\rightarrow\) 2H2O(g)
3.
Which one of the following processes involves chemical reactions?
Storing of oxygen gas under pressure in a gas cylinder.
Liquefaction of air.
Keeping petrol in a china dish in the open.
Heating copper wire in presence of air at high temperature.
4.
The following reaction is used for the preparation of oxygen gas in the laboratory
2KClO3(s) \(\frac{Heat}{Catalyst}\) 2KCl(s) + 3O2(g)
Which of the following statement(s) is/are correct about the reaction?
It is a decomposition reaction and endothermic in nature
It is a combination reaction
It is a decomposition reaction and accompanied by release of heat
It is a photochemical decomposition reaction and exothermic in nature
5.
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
Carbon dioxide or oxygen
Carbon dioxide or helium
Nitrogen or oxygen
Helium or nitrogen
1.
(d)
(ii) and (iii)
2.
(c)
2H2(g) + O2(g) \(\rightarrow\) 2H2O(l)
3.
(c)
Keeping petrol in a china dish in the open.
4.
(a)
It is a decomposition reaction and endothermic in nature
5.
(d)
Helium or nitrogen
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