Facebook Twitter Instagram
    ScienceMotive
    • Class 9
      • Matter in Our Surroundings
      • Is Matter Around Us Pure
      • Atoms and Molecules
      • Structure of the Atom
      • The Fundamental Unit of Life
    • Class 10
      • Chemistry
    • Class 11
      • Chemisrty
        • Chapter – 1 Some Basic Concepts of Chemistry
        • Chapter – 2 Structure Of Atom
        • Chapter – 3 Classification of Elements and Periodicity in Properties
        • Chapter – 4 Chemical Bonding and Molecular Structure
        • Chapter – 5 States of Matter
        • Chapter – 6 Thermodynamics
        • Chapter – 7 Equilibrium
        • Chapter – 8 Redox Reaction
        • Chapter – 10 s-Block Elements
        • Chapter – 13 Hydrocarbons
    • Class 12
      • Chemistry
        • The Solid State
        • Solutions
        • Electrochemistry
        • Chemical Kinetics
        • Surface Chemistry
        • p – Block Elements
        • d & f Block Elements
        • Coordination Compounds
        • Haloalkanes and Haloarenes
        • Alcohols, Phenols and Ethers
        • Aldehydes, Ketones and Carboxylic Acids
        • Amines
        • Biomolecules
        • Polymers
        • Chemistry in Everyday Life
    • Practice Questions
      • +1
      • +2
    • Test Series
      • Class 9 Test Series
      • Class 10 Test Series
      • Class 11 Test Series
      • Class 12 Test Series
    • World
      • Current Affairs
      • General Knowledge
    ScienceMotive
    Home » Answers to Assignment Chemical Reactions and Equations – 2nd| Class 10th

    Answers to Assignment Chemical Reactions and Equations – 2nd| Class 10th

    Dr. Vikas JasrotiaBy Dr. Vikas JasrotiaSeptember 27, 2020No Comments
    Share
    Facebook WhatsApp Telegram Twitter Email

    Answers to assignment Chemical Reactions and Equations

    This Post involves the Answers to the assignment Chemical Reactions and Equations i.e assignment No. 2 in order to get the assignment click at the link given at end of the post.

     

    Ans 16. Magnesium ribbon is cleaned before burning to remove the protective layer of basic magnesium carbonate from the surface of the magnesium ribbon.

    Ans 17. Balance chemical reaction with state symbols are as follows-

    BaCl2(aq) + Na2SO4(aq)  →  BaSO4 (s) + 2NaCl (aq)

    NaOH (aq) + HCl (aq)   → NaCl (aq) + H2O   

    Ans 18. (i). The substance whose solution is water is used for whitewashing is calcium oxide. Its formula is CaO.

        (ii). CaO (s) + H2O   →  Ca(OH)2 (s)

    Ans 19. The reaction involved is:
    Cu (s)  +  2 AgNO3 (aq) →  Cu(NO3)2  (aq)  +  2 Ag (s)

    Ans 20. A chemical reaction in which an insoluble substance (precipitate) is formed is called a precipitation reaction. For example
    AgNO3 + NaCl  →  AgCl + NaNO3

    Ans 21. The brown coloured element ‘X‘ is copper. On heating in air, it forms copper oxide, which is black in colour.
    2CuS + O2  →  2CuO

    Ans 22. We apply paint on iron articles to prevent rusting. Iron articles do not come in contact of atmospheric oxygen and moisture and thus the rusting is prevented.

    Ans 23. Oil and fat-containing items get rancid due to oxidation with atmospheric oxygen. To prevent rancidity food items are flushed with nitrogen. Nitrogen does not react with the oil and fat-containing items.

    Ans 24.  BaCl2 (aq)   +   Na2SO4  (aq)   →    BaSO4 (s)  +   2 NaCl (aq)

                                                                           Barium Sulphate    

                                                                           White Precipitate

        NaOH (aq)   +   HCl (aq)   →   NaCl (aq)   +   H2O (l)

    Ans 25. (a) 2 HNO3  +  Ca(OH)2   →   Ca(NO3)2   +   2 H2O

      (b) 2 NaOH  +   H2SO4    →    Na2SO4    +   2 H2O

      (c)  NaCl   +   AgNO3      →    AgCl   +   NaNO3

      (d)  BaCl2   +   H2SO4     →   BaSO4   +   2 HCl

     

    To get Assignment Click the Link Given Below

    2nd -Assignment Chemical Reactions and Equations | Class 10th

     

    Ans 26. The colour of the magnesium is silvery-white. And after Burning in the presence of Oxygen the colour changes to white (MgO → Magnesium oxide).

    Ans 27. The important reasons are:

    • Because, If the Concentration of the Acid will be higher then it will be a More Exothermic Reaction and if the activity will not be completed in the presence of the right Mentor then it can be very harmful.
    • To prevent the danger. Because you all know how Acids are harmful If the concentration will be higher it can Even burn the skin. And to prevent Danger, we use highly dilute Acid.

    Ans 28. SO2 and SO3 are colourless gases that are colourless and pungent smell. These gases are harmful to health.

    Ans 29. As you know now, AgCl is a photolytic Decomposing material that’s why when we kept AgCl in a black colour bottle to protect it from Sunlight.

    Ans 30. 2 AgBr(s) + Sunlight → 2 Ag(s) + Br2(g)

    Ans 31. 2 AgBr(s)  +  Sunlight  →  2 Ag(s) + Br2(g), This reaction is also Similar to the Above one(2 AgCl  → 2 Ag + Cl2). And this Reaction is used for the Black and white Photography.

    Ans 32. In this reaction, the Iron nail becomes brownish in colour and the blue colour of copper sulphate solution fade Because Iron displaces Cu (Copper) from its Position (CuSO4) Copper Sulphate. Because Iron is more reactive than Copper and it easily displaces Cu (Copper) from Copper Sulphate (CuSO4).

    And that’s why the colour of CuSO4 solution changes from Blue colour to fade and finally the solution of Copper sulphate is converted into Iron Sulphate (FeSO4).

    Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)

    Ans 33. NH4Cl, NH4NO3, Cl2, HCl(dil), Fe, Pb(NO3)2, MnO2, AgNO3, NaNO3, NaNO2, CaCO3, Ca(OH)2, H2SO4, HNO3, CuSO4, CaSO4.

    Ans 34. Strong, Weak

    Ans 35. (ii) Presence of catalyst

     

    2nd -Assignment Chemical Reactions and Equations | Class 10th

    Advertisement
    Answers Assignment - 2 Chemical Reactions And Equations
    Share. Facebook Twitter Pinterest LinkedIn Tumblr Email
    Dr. Vikas Jasrotia
    • Website

    Related Posts

    Carbon and Its Compounds

    January 23, 2023

    An element X (atomic number = 17) reacts with an element Y (atomic number = 20) to form a divalent halide.

    January 10, 2023

    States of Matter Class 11 Numericals

    March 12, 2022

    Leave A Reply Cancel Reply

    READ ALSO

    Carbon and Its Compounds

    January 23, 2023

    An element X (atomic number = 17) reacts with an element Y (atomic number = 20) to form a divalent halide.

    January 10, 2023

    General Science Questions and Answers PDF

    October 20, 2022

    When Conc. H2SO4 was added to an unknown salt in a test tube, and a brown gas (A) was evolved. This gas intensified when copper turnings were added to the test tube. On cooling gas (A) changed into a colorless gas (B). Identify the gases ‘A’ and ‘B’. Write the equations for the reactions involved.

    October 19, 2022

    Carbon and Its Compounds

    By Dr. Vikas JasrotiaJanuary 23, 2023

    CARBON AND ITS COMPOUNDS Carbon plays a very important role for all living beings. The…

    Class 10

    An element X (atomic number = 17) reacts with an element Y (atomic number = 20) to form a divalent halide.

    By Dr. Vikas JasrotiaJanuary 10, 2023

    Que. An element X (atomic number = 17) reacts with an element Y (atomic number…

    General Knowledge

    General Science Questions and Answers PDF

    By Dr. Vikas JasrotiaOctober 20, 2022

    General Science Questions and Answers PDF General Science Questions and Answers PDF Que 1. Which…

    Advertisement
    Advertisement
    Facebook Twitter Instagram Pinterest YouTube
    • Disclaimer
    • Contact Us
    • Privacy Policy 
    • Terms and Conditions
    © 2023 All Rights Reserved ScienceMotive.

    Type above and press Enter to search. Press Esc to cancel.