9th standard Science Chapter-4

9th Standard Science quiz Chapter-4

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9th Standard Science Chapter 4

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Q.31

Which of the following correctly represents 360g of water?

(i) 2 moles of water
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water

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Q.32 Which of the following statements is not true about an atom?

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Q.33 1 u or 1 amu means

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Q.34 Which of the following contains maximum number of molecules?

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Q.35 A sample of NHmolecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:

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Q.36 An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:

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Q.37 The molecular formula of potassium nitrate is ________.

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Q.38 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:

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Q.39 Molecular mass is defined as the:

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Q.40 The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.

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