Which of the following are exothermic processes?
$(i)$ Reaction of water with quicklime
$(ii)$ Dilution of an acid
$(iii)$ Evaporation of water
$(iv)$ Sublimation of camphor (crystals)

  • A
    $(i)$ and $(iv)$
  • B
    $(ii)$ and $(iii)$
  • C
    $(i)$ and $(ii)$
  • D
    $(iii)$ and $(iv)$

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Which among the following are physical or chemical changes?
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$(b)$ Burning of Liquefied Petroleum Gas $(LPG)$
$(c)$ Heating of an iron rod to red hot
$(d)$ Curdling of milk
$(e)$ Sublimation of solid ammonium chloride

Complete and balance the following chemical equations:
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$(ii)$ $Al + HCl \longrightarrow$
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How many moles are there in $4.9 \ g$ of $H_{2}SO_{4}$?

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$(a)$ $Pb(NO_3)_2(aq) + 2KI(aq) \longrightarrow PbI_2(x) + 2KNO_3(y)$
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