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. 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: Cu,Fe,Ag Ag,Cu,Fe Fe,Cu,Ag Ag,Fe,Cu None 2. 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 3. The mixture of carbon and sulphur is separated by using the solution of _________. carbon monoxide sulphur oxide carbon dioxide carbon disulphide None 4. Which information is not conveyed by a balanced chemical equation? Symbols and formula of all the substance involved in a particular reaction Physical state of reactants and products Whether a particular reaction is actually feasible or not Number of atoms/molecule of the reactants and products formed None 5. You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed? A precipitation reaction A physical reaction A redox reaction An acid base reaction None 6. Which of the following process involves chemical reaction? Compression of sponge Respiration Cutting of tree Formation of ice from water None 7. 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), (C) and (D) (A) and (B) (C) and (D) None 8. Choose the incorrect statement A combination of an element with a compound to form a new product is possible. Decomposition of single compound is not possible. Decomposition of a chemical compound into two new compounds is possible. Combination of two different elements is possible. None 9. 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. I and III only I only IIonly II and III only None 10. Which of the following pairs will give displacement reactions? MgCl2 solution and aluminium metal NaCl solution and copper metal FeSO4 solution and silver metal AgNO3 solution and copper metal. None 11. Balancing of equations is based on: Conditions for a chemical reaction to take place Principle of conservation of momentum Law of conservation of mass Avogadro's number None 12. Combustion reaction of coal is a/an __________ reaction. auto-catalytic exothermic endothermic None of these None 13. Identify the product(s) which will be formed by using the information provided about the reactants:$$Al(s) + O_{2}(g) \rightarrow $$ $$Al_{2}O_{3}$$ $$Al_{3}O_{2}$$ $$Al_{3}O_{3}$$ $$Al_{2}O_{2}$$ None 14. The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be: Brown, black and green in colour Brown in colour in all the metals Black, brown and green in colour Black in colour in all the metals None 15. Anhydrous iron (III) chloride is prepared by: decomposition displacement neutralization combination None 16. 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 combination reaction Chemical double decomposition reaction Chemical decomposition reaction Chemical displacement reaction None 17. Identify the type reaction from the following.$$H_{2}CO_{3}(aq)\rightarrow H_{2}O(l)+CO_{2}(g)$$ Double displacement reaction Decomposition reaction Combustion reaction Displacement reaction None 18. (i) Reaction between calcium oxide and water is a _______ reaction(ii) Treatment of mercuric oxide with strong heat is a ________ reaction Combination, Combination Decomposition, Combination Combination, Decomposition Decomposition, Decomposition None 19. Chemical volcano is an example of: none of the above combination reaction displacement reaaction decomposition reaction None 20. Which of the following is not a characteristic of a chemical reaction? Formation of precipitate Change in color None of the above Change in temperature 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.
