Chemical Reactions & Equations-Class X


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Chemical Reactions & Equations-Class X - Vasu Classes

1. Which of the following is/ are true?

a) Chemical reaction occur with evolution or absorption of heat
b) In a chemical reaction mass of products is less than the mass of reactants
c) chemical reaction takes place by the change of state
d) A and C

2. A balanced equation has

a) Equal number of molecules on both sides
b) Unequal number of atoms on both sides
c) Equal number of atoms of each element on both sides
d) Mass of reactants = mass of products
e) C and D

3. The respiration is an

a) Endothermic reaction
b) Exothermic reaction
c) Combination reacton
d) Displacement reaction

4. The reaction in which two or more substances combine to form a single substance is called

a) combination reaction
b) displacement reaction
c) decomposition reaction

5. What type of reaction takes place when sunlight falls on a photographic film

a) Electric decomposition
b) Combination
c) Photochemical reaction
d) Displacement reaction

6. The reaction in which one element takes place of another element is called

a) Displacement reaction
b) Redox reaction
c) Combination reaction
d) Double displacement reaction

7. Which of the following compounds is called quick lime?

a) Lime stone
b) Slaked lime
c) Soda water
d) Calcium oxide
e) None

8. During the electrical decomposition of water oxygen and hydrogen are obtained in the ratio of... by volume

a) 2:1
b) 3:1
c) 1:2
d) 1:3

9. Which set of metals is below hydrogen in reactivity series?

a) Cu , Pt ,Au , Fe
b) Ni,Zn , Mg ,Cu
c) Hg , Au ,Pt
d) Ba ,Sn ,Ag ,Pt

10. Which of the following is oxidation?

a) Removal of oxygen , gaining of electrons
b) Adding of hydrogen , losing of electrons
c) Adding of oxygen .gaining of electrons
d) Removal of hydrogen , removal of electrons

11. In the combination of Sodium and Chlorine which one is oxidised?

a) Chlorine
b) Sodium Chloride
c) Sodium
d) None

12. Rusting of iron is a process of

a) Reduction
b) Oxidation
c) Redox process
d) Displacement reaction

13. The colour of ferrous sulphate solution is

a) Dark red
b) Brown
c) Blue
d) Greenish

14. A shiny brown substance X on heating in air becomes black in colour. Name the element X and black coloured compound formed

a) Fe , Feo
b) Cu ,CuO
c) Mg ,MgO
d) Ag ,Ag2O

15. In the reaction which substance is reduced
2PbO+C =2Pb+ CO2

a) C
b) PbO
c) Pb
d) CO2

16. In the given reaction which substance is an oxidising agent?
H2S+Cl2=S + 2HCl

a) H2S
b) Cl2
c) HCl
d) S

17. In the given reaction which one is a reducing agent
A2+ + B2- =A + B

a) B2-
b) A2
c) None

18. Aerial oxidation of oily foods is called

a) fermentation
b) rancidity
c) corrosion
d) All of the above
e) None

19. Which of the following statement is correct?

a) Oxidation involves gain of electrons
b) The substance which gets reduced is called reducing agent
c) Exothermic reactions proceeds with evolution of heat
d) NaHCO3 is washing soda
e) B and C

20. In reactivity series metals are arranged

a) in increasing order of reactivity
b) decreasing order of reactivity
c) Above hydrogen decreasing order below hydrogen increasing orderof reactivity

21. Which one is used for white washing?

a) Solution of slaked lime
b) Quick lime
c) Lime stone
d) baking soda

22. When old bonds are broken

a) Energy is released
b) Energy is absorbed
c) No change in energy
d) None

23. AgNO3 (aq) + NaCl (aq) = AgCl(s) + NaNO3(aq) The given reaction is

a) precipitation reaction
b) double displacement reaction
c) combination reaction
d) Both A and B

24. Which of the following statement is not correct to prevent food from getting rancid? We..

a) store the food in air tight containers
b) adding antioxidants
c) flush bags of chips with an inert gas
d) increase the temperature of food

25. Lead Nitrate on heating gives

a) Lead Oxide
b) Nitrogen dioxide
c) Oxygen
d) All of the above

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