CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 4 - MCQExams.com

Write the balanced chemical reaction for the reaction of magnesium with hot water.
  • $$2Mg + 3H_2O \rightarrow 2MgOH + 3H_2$$
  • $$Mg + 2H_2O \rightarrow  Mg(OH)_2 + H_2$$
  • $$2Mg + 3H_2O \rightarrow 3MgOH + 3H_2$$
  • $$Mg + 3H_2O \rightarrow 2MgOH + 3H_2$$
Write a balanced chemical equation with state symbols for the following reaction:

When lithium hydroxide pellets are added to a solution of sulphuric acid, lithium sulphate and water are formed.
  • LiOH(s) + 2H$$_2$$SO$$_4$$(aq) $$\rightarrow$$ Li$$_2$$SO$$_4$$(aq) + 2H$$_2$$O(l)
  • LiOH(s) + H$$_2$$SO$$_4$$(aq) $$\rightarrow$$ Li$$_2$$SO$$_4$$(aq) + H$$_2$$O(l)
  • 2LiOH(s) + 2H$$_2$$SO$$_4$$(aq) $$\rightarrow$$ Li$$_2$$SO$$_4$$(aq) + 2H$$_2$$O(l)
  • 2LiOH(s) + H$$_2$$SO$$_4$$(aq) $$\rightarrow$$ Li$$_2$$SO$$_4$$(aq) + 2H$$_2$$O(l)
Breaking of lead bromide into lead and bromine is an example of _____.
  • decomposition reaction
  • synthesis reaction
  • displacement reaction
  • neutralisation reaction
Find the values of w, x, y and z for the following reaction. Also, identify the type of reaction.

w(Potassium bromide) + x(Barium iodide) $$\longrightarrow $$ y(Potassium iodide) + z(Barium bromide)
  • 1, 1, 1, 1 ; Double displacement reaction
  • 1, 1, 1, 1 ; Decomposition reaction
  • 2, 1, 2, 1 ; Double displacement reaction
  • 2, 1, 2, 1 ; Decomposition reaction
In the reaction $$FeSO_4 + x\, \rightarrow\, Na_2SO_4 + Fe(OH)_2,x$$ is:
  • $$Na_2SO_4$$
  • $$H_2SO_4$$
  • $$NaOH$$
  • None of these
Which of the following is/are a decomposition reaction(s)?
  • $$\displaystyle 2HgO\quad \xrightarrow { Heat } \quad 2Hg+{ O }_{ 2 }$$
  • $$\displaystyle { CaCO }_{ 3 }\quad \xrightarrow { Heat } \quad CaO+{ CO }_{ 2 }$$
  • $$\displaystyle 2{ H }_{ 2 }O\quad \xrightarrow { Heat } \quad 2H_{ 2 }+{ O }_{ 2 }$$
  • All of these
Which of the following is a decomposition reaction ? 
  • $$NaOH + HCl \rightarrow NaCl + H_2O$$
  • $$NH_{4}CNO \rightarrow\ H_{2}NCONH_2$$
  • $$2KClO_3 \rightarrow\ 2KCl + 3O_{2}$$
  • $$H_{2} + I_{2} \rightarrow\ 2HI$$
Which of the following is the correctly balanced chemical equation?
  • $$Ca(OH)_2$$ + $$HF$$ $$\longrightarrow$$ $$2H_2O$$ + $$CaF_2$$
  • $$Ca(OH)_2$$ + $$HF$$ $$\longrightarrow$$ $$2H_2O$$ + $$2CaF_2$$
  • $$Ca(OH)_2$$ + $$2HF$$ $$\longrightarrow$$ $$2H_2O$$ + $$2CaF_2$$
  • $$Ca(OH)_2$$ + $$2HF$$ $$\longrightarrow$$ $$2H_2O$$ + $$CaF_2$$
The main cause of rancidity in foods is:
  • bacteria
  • proteins
  • antioxidants
  • oxidation of the fatty acid molecule
$$CuO(s) + H_2(g) \rightarrow Cu(s) + H_2O(l)$$ 
In this reaction, _______ is reduced. 
  • copper oxide
  • copper
  • hydrogen
  • water
Which of the following is not a decomposition reaction ?
  • CaCO$$_3$$ $$\rightarrow$$ CaO + CO$$_2$$
  • 2KClO$$_3$$ $$\rightarrow$$ 2KCl + 3O$$_2$$
  • Digestion of food in the body
  • NaOH + HCl $$\rightarrow$$ NaCl + H$$_2$$O
Write the balanced chemical reaction of the following:

If a copper coil is placed into a solution of silver nitrate, silver crystals form on the surface of the copper. Additionally, highly soluble copper (I) nitrate is generated.
  • Cu(s) + 2AgNO$$_3$$(aq) $$\rightarrow$$ Ag(s) + CuNO$$_3$$(aq)
  • 2Cu(s) + AgNO$$_3$$(aq) $$\rightarrow$$ Ag(s) + 2CuNO$$_3$$(aq)
  • Cu(s) + AgNO$$_3$$(aq) $$\rightarrow$$ Ag(s) + 2CuNO$$_3$$(aq)
  • Cu(s) + AgNO$$_3$$(aq) $$\rightarrow$$ Ag(s) + CuNO$$_3$$(aq)
Formation of nitric oxide from nitrogen and oxygen is a ______ reaction.
  • combination
  • displacement
  • calcination
  • roasting
$$Zn + xHCl \rightarrow ZnCl_2 + A$$
In above equation A and x are :
  • $$H_2, 2$$
  • $$Cl_2, 1$$
  • $$H_2, 3$$
  • $$H_2, 4$$
$$\displaystyle xFe+yH_{2}O\rightarrow zFe_{3}O_{4}+wH_{2}$$
What are $$x, y, z$$ and $$w$$ respectively ?
  • 1, 2, 3, 4
  • 2, 3, 1, 2
  • 3, 4, 1, 4
  • 3, 3, 3, 3
Which of the following statement about the following reaction is correct
$$ZnO + CO\, \rightarrow\, Zn +CO_2$$
  • $$ZnO$$ is being oxidised
  • $$CO$$ is being reduced
  • $$CO_2$$ is being oxidised
  • $$ZnO$$ is being reduced
The substances you start with are called ______ and after the chemical change, what is formed is called the _______.
  • reactants, products
  • reactants , gases
  • element , products
  • element , compounds
Select the correct alternative.
The reaction between acid and base to form salt and water is an example of :
  • decomposition reaction
  • combination reaction
  • double displacement reaction
  • neutralization reaction 
Which of the following reaction will not take place?
  • $$Zn+FesO_4\rightarrow ZnSO_4+Fe$$
  • $$2KI+Cl_2\rightarrow 2KCl+I_2$$
  • $$Zn+MgSO_4\rightarrow ZnSO_4+Mg$$
  • $$Mg+CuSO_4\rightarrow MgSO_4+Cu$$
The term used to indicate the development of unpleasant smell and taste in fat and oil-containing foods due to aerial oxidation is:
  • acidity
  • radioactivity
  • rabidity
  • rancidity
The equation $$Cu+XHNO_3\rightarrow Cu(NO_3)_2+YNO_2+2H_2O$$, the values of $$X$$ and $$Y$$ are:
  • 3 and 1
  • 8 and 6
  • 1 and 1
  • 7 and 1 
Which of the following statement(s) about a balanced chemical equation is/are true?
  • Mass is conserved
  • Atoms are conserved
  • Both A and B
  • None of these
Determine the reaction type for the given reaction.
$$P_4O_{10}+6H_2O\rightarrow 4H_3PO_4$$
  • Decomposition reaction
  • Combination reaction
  • Displacement reaction
  • Double displacement reaction
Copper sulphate solution, which is blue in colour, will change to a colourless solution with the addition of which metal?
  • $$Au$$
  • $$Ag$$
  • $$Zn$$
  • All of these
When the following equation is balanced, the coefficients $$a, b$$ and $$c$$ will be: 
$$aKClO_3 \rightarrow bKCl + cO_2$$
  • 1, 2, 2
  • 2, 1, 3
  • 1, 3, 3
  • 2, 2, 3
The reaction $$\mathrm{2Na}+\mathrm{Cl}_2\rightarrow \mathrm{2NaCl}$$ is an example of:
  • combination reaction
  • decomposition reaction
  • displacement reaction
  • double displacement reaction
Consider the following statements about a chemical reaction. Which one is true?
  • The total number of molecules remains unchanged
  • The total number of moles remains the same
  • The total mass is not altered
  • The total number of reaction molecules is equal to the total number of molecules of the products formed
Which of the statement is correct about the following reaction?
$$2KClO_3(s)\underset {catalyst}{\xrightarrow {Heat}}2KCl(s)+3O_2(g)$$
  • It is a decomposition reaction and endothermic in nature.
  • It is a combination reaction.
  • It is a decomposition reaction and is accompanied by the evolution of heat.
  • It is a photochemical decomposition reaction and exothermic in nature.
Consider the following reactions :
$$CuSO_4+Fe\rightarrow FeSO_4+Cu$$
$$FeSO_4+Zn\rightarrow ZnSO_4+Fe$$
Among these:
  • $$Zn$$ is most reactive and $$Fe$$ is least reactive
  • $$Fe$$ is most reactive and $$Cu$$ is least reactive
  • $$Zn$$ is most reactive and $$Cu$$ is least reactive
  • $$Cu$$ is most reactive and $$Fe$$ is least reactive

Which of the following processes can not take place in the absence of oxygen?
  • Combustion
  • Displacement
  • Combination
  • All of the above
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