Ncert – class 10- science – Chapter 1 – Chemical Reactions and Equations 2 Welcome to your Ncert - class 10- science - Chapter 1 – Chemical Reactions and Equations 2 1. Balancing of equations is based on: Conditions for a chemical reaction to take place Law of conservation of mass Avogadro's number Principle of conservation of momentum None 2. The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be: Black in colour in all the metals Brown, black and green in colour Black, brown and green in colour Brown in colour in all the metals None 3. Anhydrous iron (III) chloride is prepared by: combination neutralization displacement decomposition None 4. Balanced chemical equations imply which of the following?I. Numbers of molecules are conserved in chemical changeII. Numbers of atoms are conserved in chemical change.III. Mass is conserved in chemical change. IIonly I and III only II and III only I only None 5. Identify the product(s) which will be formed by using the information provided about the reactants:$$Al(s) + O_{2}(g) \rightarrow $$ $$Al_{2}O_{3}$$ $$Al_{2}O_{2}$$ $$Al_{3}O_{3}$$ $$Al_{3}O_{2}$$ None 6. Take 5 mL of sodium sulphate solution in a test tube and 5 mL of barium chloride solution in another test tube. Mix the two solutions slowly and leave the test tube undisturbed for some time. A white precipitate is formed after some time.Which of the following statements is correct about the above reaction? It is a displacement reaction since chloride ions are replaced by sulphate ions It is a double displacement reaction since exchange of ions occurs between the two reactants. It is a neutralisation reaction since an acid reacts with alkali to give a salt. It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate. None 7. Choose the incorrect statement Decomposition of single compound is not possible. A combination of an element with a compound to form a new product is possible. Combination of two different elements is possible. Decomposition of a chemical compound into two new compounds is possible. None 8. Identify the type reaction from the following.$$H_{2}CO_{3}(aq)\rightarrow H_{2}O(l)+CO_{2}(g)$$ Decomposition reaction Combustion reaction Double displacement reaction Displacement reaction None 9. You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed? A physical reaction A redox reaction An acid base reaction A precipitation reaction None 10. When sodium hydroxide solution is added to copper sulfate solution, a blue precipitate of copper hydroxide is formed along with sodium sulfate solution. What kind of chemical reaction takes place between them? Chemical decomposition reaction Chemical double decomposition reaction Chemical displacement reaction Chemical combination reaction None 11. (i) Reaction between calcium oxide and water is a _______ reaction(ii) Treatment of mercuric oxide with strong heat is a ________ reaction Combination, Decomposition Combination, Combination Decomposition, Decomposition Decomposition, Combination None 12. Calcium oxide reacts vigorously with water to produce slaked lime.$$CaO(s)+ H_{2}O(l)\rightarrow Ca(OH)_{2}(aq)+ heat$$This reaction can be classified which of the following?(A) Combination reaction(B) Exothermic reaction(C) Endothermic reaction(D) Decomposition reaction (A) and (C) (A) and (B) (C) and (D) (A), (C) and (D) None 13. Which of the following is not a characteristic of a chemical reaction? Formation of precipitate None of the above Change in color Change in temperature None 14. Which information is not conveyed by a balanced chemical equation? Physical state of reactants and products Whether a particular reaction is actually feasible or not Symbols and formula of all the substance involved in a particular reaction Number of atoms/molecule of the reactants and products formed None 15. Study the following chemical reactions.$$Fe+CuSO_{4}\rightarrow FeSO_{4}+Cu$$$$$$2AgNO_{3}+Cu\rightarrow Cu(NO_{3})_{2}+2Ag$$The metals present in the reactions can be written in the increasing order of reactivity as: Fe,Cu,Ag Ag,Cu,Fe Ag,Fe,Cu Cu,Fe,Ag None 16. Chemical volcano is an example of: combination reaction displacement reaaction decomposition reaction none of the above None 17. Combustion reaction of coal is a/an __________ reaction. exothermic None of these auto-catalytic endothermic None 18. The mixture of carbon and sulphur is separated by using the solution of _________. sulphur oxide carbon dioxide carbon disulphide carbon monoxide None 19. Which of the following process involves chemical reaction? Respiration Compression of sponge Formation of ice from water Cutting of tree None 20. Which of the following pairs will give displacement reactions? AgNO3 solution and copper metal. MgCl2 solution and aluminium metal NaCl solution and copper metal FeSO4 solution and silver metal None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
