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