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