1) what type of chemical reaction take place when calcium carbonate is heated? a) displacement b) decomposition c) combination d) double displacement 2) which type of reaction is burning of coal? a) displacement b) decomposition c) double displacement d) combination 3) which gas appears in the form of brown smoke a) cl2 b) co2 c) No2 d) So2 4) Enu, sunlight, white, silver chloride get converted into grey coloured substance, due to which substance is this colour? a) Cl2 b) No2 c) Ag d) Agcl 5) what is formed by the reaction of metal oxide with water? a) Acid b) Base c) salt d) H2 gas 6) which of the following is a weak base a) NaoH b) NH4oH c) KoH d) C2H5OH 7) which non-metal occur in liquid state? a) Sulphar b) argon c) bromine d) carbon 8) which metal can cut easily with knife a) sodium b) calcium  c) magnesium d) iron 9) which of the following acid is present in lemon? a) acetic acid b) citric acid c) tartaric acid d) lactic acid 10) which of the following metal gives H2 gas when it’s react with acid as well as base? a) Cu b) Fe c) Zn d) Ag 11) which is the molecular formula of baking soda? a) Na2Co3 b) NaHco3 c) Nacl d) Na2HCo3 12) which is the most malleable metal? a) silver b) gold c) lead d) copper 13) which type of hydrocarbon compound is C3H8 a) unsaturated b) Alkyne c) Alkene d) Alkane 14) which is the molecular formula of ethanol a) Ch3CH2CH2OH b) C2H5COOH c) CH3COOH d) C2H5OH 15) how many covalent bonds in C4H10 a) 16 b) 15 c) 14 d) 17

science test (section A)

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