Chemical Reactions And Equations - MCQ Test (22-11-2017) - Class 10 MCQ

A reaction which is opposite of combination reaction
(i) NH₄Cl→Heat NH₃+HCl
(ii) 2H₂O→dectricity2H₂+O₂
(iii) Fe+H₂SO₄→FeSO₄+H₂

Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be

Mg ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, Magnesium oxide. Magnesium is

What happens when dilute HCl is added to iron fillings? Select the correct answer.

Which is correct about oxidation?

A. Gain of oxygen 
B. Loss of hydrogen 
C. Loss of electron 
D. Gain of hydrogen

The colour of zinc metal is

The reactions in which more reactive element can displace less reactive element from a compound are called

Colour of copper sulphate solution changes when an iron nail is dipped in it because of

Fatty foods become rancid because of 

Which one of the following will be required to identify the gas evolved when diluted HCl reacts with zinc metal?

Decomposition of ferrous sulphate into Fe₂O₃,SO₂ andSO₃ occurs in the presence of

What happens when copper metal is added to silver nitrate solution?

Which of the following statement is correct? 

A. Electrolysis of water is an example decomposition reaction 
B. Nitrogen is used to prevent rancidity 
C. Melting of ice is a physical change 
D. Corrosion requires presence of both air and moisture

Which of the following is not a balanced chemical equation?

The compound formed by Hg⁺² and Cl⁻ is

Fe₂O₃+2Al→Al₂O₃+2Fe This reaction is an example of -

Reaction between water and quick lime gives rise to calcium hydroxide which of the following statement are correct?

A. The reaction is exothermic
B. The PH of final solution is less than 7
C. The reaction is endothermic
D. The PH of final solution is greater than 7

Can we store CuSO₄ in iron container and why?

H₂S burns in air to give

Pieces of Zn metal are added to four different test tubes containing different solutions. In which test tube no change is observed?

For the reaction, 3Fe+4H₂O→Fe₂O₃+4H₂. Which of the following statement is correct?

A. Iron is oxidized
B. water is reduced
C. water act as reducing agent
D. Iron act as reducing agent

The odour of SO₂ gas is

ZnO+C→Zn+CO is an example of

Metathesis reactions are called-

Which of the following solution is obtained on reacting zinc metal with NaOH solution

Find the incorrect statement :

(I) oxygen is highly combustible and hydrogen is supporter of combustion,
(II) Oxygen and hydrogen both are highly combustible,
(III) Oxygen and hydrogen both are supporters of combustion,
(IV) Hydrogen is highly combustible and oxygen is supporter of combustion

Solutions of ferous sulphate, zinc sulphate, copper sulphate and aluminium sulphate were separately taken in four test tubes and some iron nails were placed in each of the solutions. After few minutes, it would be observed that the colour of :

(i) Solutions of zinc sulphate, copper sulphate and aluminium sulphate changed and that of ferous sulphate did not change. (ii) Solutions of zinc sulphate and aluminium sulphate only changed. (iii) Copper sulphate solution only changed (iv) All the four solutions changed