Which of the following is a pair of physical and chemical property respectively of a substance ?
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Chemistry MCQs for NEET — Practice Questions with Answers
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What is the symbol of S.I. unit for the amount of substance ?
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Explanation
The SI unit for the amount of substance is 'mol' (mole). It represents the number of particles (atoms, molecules, ions, etc.) present in a given substance. One mole contains approximately 6.022 × 10^23 particles, known as the Avogadro constant.
Find the correct relation.
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In chemistry a number is represented in the form $ N \times 10^n $ . This method of expressing the number is called scientific notation. What is the value of ‘N’ here.
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What is the correct scientific notation for 0.00016 ?
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How many significant digits are there in 0.25 ?
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Explanation
Significant figures are the digits that carry meaning and contribute to the value of a number. In 0.25, both digits (2 and 5) are significant figures, so the answer is 2 significant digits.
What is the number of neutrons in $ Zn^{2+} $ ion (Atomic mass number = 70) (IITJEE 1979)
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Find the total number of electrons in one molecule of carbon dioxide.
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A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore, the ratio of their number of molecules is
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Explanation
The ratio by weight = 1 / 4 $ \therefore Ratio of moles = { 1/32 \over 4 /28 } = { 28 \over 4 \times 32 } = { 7 \over 32 } $
$ 90 g KClO_3 $ on heating gives 2.96g KCl and 1.92g oxygen. Which of the following laws is illustrated by this statement ?
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Explanation
The statement illustrates the law of mass conservation, which states that matter can neither be created nor destroyed in a chemical reaction. The total mass of reactants (90 g KClO3) is equal to the total mass of products (2.96 g KCl + 1.92 g O2).
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