Download CLASS-X SC (Chemical Reactions and Equations)

CLASS-X SC
(Chemical Reactions and Equations)
1. Copper displaces which of the following metals from its salt solution:
(a) ZnSO4
(b) FeSO4
(c) AgNO3
(d) NiSO4
2. In an electrolytic cell where electrolysis is carried, anode has:
(a) Positive change (b) Negative charge (c) Connected to negative terminal of the battery
(d) None of these is correct.
3. The reaction H2+Cl2 2HCl represents:
(a) Oxidation
(b) Reduction
(c) Decomposition (d) Combination
4. In the reaction PbO + C Pb + CO
(a) Pbo is oxidized
(b) C act as an oxidizing agent
(c) C act as a reduction agent
(d) Reaction does not represent redox reaction.
5. A substance which oxidizes itself and reduces other is known as
(a) Oxidizing agent
(b) Reducing agent (c) Both (a) and (b) (d) None of these.
6. What happens chemically when quick lime is added to water?
7. Why is a combustion reaction an oxidation reaction?
8. Why are food particle preferably packed in aluminum foil?
9. What happens to lime water when Co2 gas is bubbled through it in excess?
10. Identify the type of reaction in the following
(a) ZnCO3 + 2HCl (aq) ZnCl2 (aq) + H2CO3 (aq)
(b) 2NaBr (aq) +Cl (g) 2Nacl (aq) + Br2 (aq)
(c) 2CuO (S) 2Cu (s) + O2 (g)
11. A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The
evolved gas was then passed through lime water. What change would be observed in lime water?
Write balanced chemical equation for both the change observed?
12. In the reaction MnO2 +4HCl MnCl2 + 2H2O +Cl2
(a) Name the substance oxidized. (b) Name the oxidizing agent.
(c) Name the reducing agent and the substance reduced.
13. Give one example each of
(1) Thermal decomposition
(2) Electrolytic decomposition
(3) Photo decomposition
14. A metal is heated with dil H2SO4.
Answer the following
(a) Name the gas.
(b) Name the method of collection of gas.
(c) Is the gas soluble or insoluble in water?
(d) Is the gas lighter or heavier than air?
15. Identify the type of chemical reaction
(i) A→ B +C
(ii) AD +CD→ AD +CB
16. Why does not silver evolve hydrogen on reacting with dil H2 SO4 ?
17. Way do diamond and graphite, the two allotropic forms of carbon evolve different amounts of heat
on combustion?
18. What is the sole of oxidizing agent is a reaction?
19. (a) Define Rusting
(b) Why do you apply paint an iron articles?
20. White the balanced reactions for the following
(i) Potassium Bromide (aq) + Barium iodide (aq) → Potassium iodide (aq) + Barium Bromide(aq)
(ii) Zinc carbonate (s) →Zinc oxide (s) + carbon dioxide (g)
(iii) Hydrogen (g) + chlorine (g) →Hydrogen chloride
21. The reaction is given by Zn + H2 SO4 →ZnSO4 + H2
(i) White the ionic equation for the reaction
(ii) The ionic equations can be represented by two half equations.
Write these equations.
(iii) Explain why this is a redox reaction?
22. What are neutralization reactions? Why are they named so? Give one example?
23. You are given with
(a) Iron Nails (b) CuSO4 solution (c) Bacl2 (d) Cu powder (e) Ferrous sulphate crystal (f) Quick lime.
Make five reactions that can take place from these materials.
(Acid Base and Salt)
1. An acid can react with
(a) AgCl
(b) Na2 CO3
(c) PbSO4
2. Which of the following gives 2 CO on heating?
(a) Slaked
(b) Quick lime
(c) Lime stone
3. Plaster of Paris is made from
(a) Lime stone
(b) Slaked Lime
(c) Quick lime
4. Which is a base and not alkali?
(d) Na2 SO4
(d) Soda ash.
(d) Gypsum
(a) NaOH
(b) KOH
(c) )Fe3 (OH)
(d) None
5. Chemical formula of baking soda is
(a) MgSO4
(b) Na2 CO3
(c) NaHCO3
(d) MgCO3
6. The H+ ion concentration of a solution is1.0×10−5m. The solution is
(a) Acidic
(b) Alkaline (c) Neutral (d) Amphoteric
7. An aqueous solution with pH-zero is
(a) Acidic
(b) Alkaline (c) Neutral (d) Amphoteric
8. Setting of Plaster of Paris takes place due to
(a) Oxidation
(b) Reduction (c) Dehydration (d) Hydration
9. The odour of acetic acid resembles that of
(a) Rose
(b) Burning Plastic (c) Vinegar (d) Kerosene
10. Give the name and formula of two
(i) Strong monobasic acids (ii) two weak dibasic acids
11. What happens to the crystals of washing soda when exposed to air?
12. What is the chemical name of washing soda? Name three raw materials used in making washing
soda by Solvay process?
13. What is efflorescence? Give an example?
14. Why is sodium hydrogen carbonate an essential ingredient is antacids?
15. (a) Name the raw materials used is the manufacture of sodium carbonate by Solvay process?
(b) How is sodium hydrogen carbonate from a mixture of NH4Cl and NaHCO3 ?
16. Write equations for the following reactions
(i) Dilute sulphuric acid reacts with zinc granules
(ii) Dilute hydrochloric acid reacts with magnesium ribbon.
(iii) Dilute sulphuric acid reacts with aluminum powder.
17. (a) An aqueous solution has a PH value of 7.0. Is this solution acidic, basic or neutral?
(b) If H+ concentration of a solution is 1×10-2mol L-1what will be its P4 value?
(c) Which has higher PH value: 1−M HCl or 1−M NaOH
18. What will you observe when:
(i) Red litmus is introduced into a solution of sodium sulphate.
(ii) Methyl orange is added to dil HCl.
(iii). Blue litmus is introduced into a solution of ferric chloride
19. (a) The PH of rain water collected from two cities A and B was found to be 6 and 5 respectively.
Water of which city is more acidic? Find out the ratio of hydrogen ion concentration in the two
samples of rain water?
(b) Arrange the following in order (ascending) of their P4 values. NaOH solution, Blood, lemon Juice.
(Life Processes)
1. Amoeba shows following kind of nutrition –
a) autotrophic
b) holozoic
c) saprotrophic
d) parasitic
2. The process by which blood is cleared of metabolic wastes in case of kidney failure is called –
a) artificial kidney b) dialysis
c) transplantation d) filtration
3. Woody plants carry gaseous exchange through
a) root hair
b) stem hair
c) Lenticels
d) epidermal cells.
4. Where does digestion of starch begin in human body?
5. Which of the following statements about the autotrophs is incorrect?
a) They store carbohydrates in the form of starch.
b) They constitute the first trophic level in food chains.
c) They convert CO2 and water into carbohydrates in the absence of sunlight
d) They synthesize carbohydrates from CO2 and water in the presence of sunlight & Chlorophyll.
6. Which of these is not a part of the small intestine?
a) Duodenum
b) Jejunum c) Ileum
d) Rectum
7. During contraction of heart, what prevents backflow of blood?
a) Thin walls of atria b) Thick muscular walls of ventricles
c) Valves in heart
d) All of the above
8. Name excretory organ in amoeba and earthworm
9. Name the plant tissue through which water and minerals are transported in plants
10. What are the two stages in photosynthesis?
11. What is the difference between arteries & veins?
12. What is villi? What are its functions?
13. What type of respiration takes place in human muscles during vigorous exercise and why?
14. What is “translocation”? Why it is essential for plants.
15. How respiration does takes place in plants?
16. How is transpiration pull responsible for upward movement of water?
17. Discuss the major steps involved in process of nutrition in human beings.
18. With the help of a labelled diagram of human excretory system, Mention its important part and
explain them.
19. Give one example each of saprophytic and parasitic nutrition.
20. What is common for cuscuta, ticks and leeches?
21. What advantage over an aquatic organism does a terrestrial organism have with regard to
obtaining oxygen for respiration?
22. Differentiate between single and double circulation found in vertebrates.
23. Name the substrates for the following enzymes a) trypsin b) amylase c) pepsin d) lipase
24. What are the functions of lymph in our body?
25. How is haemoglobin associated with respiration explained?
26. What are the modes of excretion in plants?
27. Give an experiment to prove the essentiality of light for photosynthesis
28. What is ‘clotting of blood’? Write a flow chart showing major events taking place in clotting of blood?