You are provided with a fine white-coloured powder which is either sugar or salt. How would you identify it without tasting?

  • A
    By heating the powder
  • B
    By checking electrical conductivity in aqueous solution
  • C
    Both $A$ and $B$
  • D
    None of the above

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State whether the following statement is true or false:
Sodium shows valency of $Na^+$ and $Na^{2+}$.

$A$ sample of vitamin $C$ is known to contain $2.58 \times 10^{24}$ oxygen atoms. How many moles of oxygen atoms are present in the sample?

What formed the basis for John Dalton to formulate Dalton's atomic theory?

Write the chemical formulae for the following substances and calculate the molecular mass for each one of them:
$(a)$ Caustic potash
$(b)$ Baking soda
$(c)$ Limestone
$(d)$ Caustic soda
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Calculate the mass of $10$ carbon atoms.

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