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. Choose the incorrect statement Combination of two different elements is possible. Decomposition of single compound is not possible. Decomposition of a chemical compound into two new compounds is possible. A combination of an element with a compound to form a new product is possible. None 2. 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 (B) (A), (C) and (D) (C) and (D) (A) and (C) None 3. The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be: Brown in colour in all the metals Black in colour in all the metals Black, brown and green in colour Brown, black and green in colour None 4. 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,Fe,Cu Fe,Cu,Ag Ag,Cu,Fe None 5. The mixture of carbon and sulphur is separated by using the solution of _________. carbon dioxide sulphur oxide carbon disulphide carbon monoxide None 6. Combustion reaction of coal is a/an __________ reaction. auto-catalytic None of these endothermic exothermic None 7. Identify the product(s) which will be formed by using the information provided about the reactants:$$Al(s) + O_{2}(g) \rightarrow $$ $$Al_{3}O_{3}$$ $$Al_{2}O_{2}$$ $$Al_{3}O_{2}$$ $$Al_{2}O_{3}$$ 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 double decomposition reaction Chemical displacement reaction Chemical combination reaction Chemical decomposition reaction None 9. Anhydrous iron (III) chloride is prepared by: combination neutralization displacement decomposition None 10. Which of the following pairs will give displacement reactions? AgNO3 solution and copper metal. NaCl solution and copper metal MgCl2 solution and aluminium metal FeSO4 solution and silver metal None 11. Chemical volcano is an example of: none of the above displacement reaaction decomposition reaction combination reaction None 12. (i) Reaction between calcium oxide and water is a _______ reaction(ii) Treatment of mercuric oxide with strong heat is a ________ reaction Decomposition, Combination Combination, Combination Decomposition, Decomposition Combination, Decomposition None 13. 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 14. 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 15. 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. II and III only I only I and III only IIonly None 16. Identify the type reaction from the following.$$H_{2}CO_{3}(aq)\rightarrow H_{2}O(l)+CO_{2}(g)$$ Displacement reaction Combustion reaction Double displacement reaction Decomposition reaction None 17. 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 18. Which of the following process involves chemical reaction? Compression of sponge Formation of ice from water Respiration Cutting of tree None 19. 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 20. Which of the following is not a characteristic of a chemical reaction? None of the above Change in temperature Formation of precipitate Change in color 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.
