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Which of the following correctly represents 360 g of water?
(i) 2 moles of H₂0
(ii) 20 moles of water
(iii) 6.022 × 10²³ molecules of water
(iv) 1.2044×10²⁵ molecules of water

(ii) and (iv)(ii) and (iii)(i) and (iv)(i)

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Which of the following statements is not true about an atom?

Atoms aggregate in large numbers to form the matter that we can see, feel or touchAtoms are always neutral in natureAtoms are the basic units from which molecules and ions are formedAtoms are not able to exist independently

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The chemical symbol for nitrogen gas is

NN⁺N₂Ni

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The chemical symbol for sodium is

NaNASdSo

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Which of the following would weigh the highest?

10 moles of H₂O2 moles of CaCO₃2 moles of CO₂0.2 mole of sucrose (C₁₂ H₂₂ O₁₁)

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Which of the following has maximum number of atoms?

18g of CH₄18g of CO₂18g of O₂18g of H₂O

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Which of the following contains maximum number of molecules?

1g CH₄1g H₂1g N₂1g CO₂

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Mass of one atom of oxygen is

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3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are

6.022 × 10²¹6.022 × 10²³6.09 × 10²²6.68 × 10²³

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A change in the physical state can be brought about

without any energy changewhen energy is either given to, or taken out from the systemonly when energy is taken out from the systemonly when energy is given to the system