$A$ change in the physical state can be brought about:

  • A
    only when energy is given to the system
  • B
    when energy is either given to,or taken out from the system
  • C
    only when energy is taken out from the system
  • D
    without any energy change

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Similar Questions

Write the chemical formulae for the following compounds and find the ratio by mass of the combining elements in each one of them.
$(N=14 \ u, H=1 \ u, C=12 \ u, O=16 \ u, S=32 \ u)$
$(a)$ Methane
$(b)$ Carbon dioxide
$(c)$ Hydrogen sulphide

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Calculate the mass of:
$(a)$ $1$ atom of carbon
$(b)$ $0.02$ mole of sodium
$(c)$ $1$ molecule of water.

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Write the molecular formulae of all the compounds that can be formed by the combination of the following ions: $Cu^{2+}, Na^{+}, Fe^{3+}, Cl^{-}, SO_{4}^{2-}, PO_{4}^{3-}$.

Which of the following will have maximum mass?

Find the total number of atoms present in one $SO_{4}^{2-}$ ion.

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