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TARGET PUBLICATION-SOME BASIC CONCEPTS OF CHEMISTRY-COMPETITIVE THINKING
- The SI unit of density is:
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- A sample of pure carbon dioxide, irrespective of its source contains 2...
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- Which of the following properties of an element is a whole number ?
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- The weight of a molecule of the compoundC(60)H(122) is
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- Boron has two stable isotopes, .^(10)B(19%) and .^(11)B(81%). The atom...
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- An element X has the following isotopic composition : .^(200)X:90%,"...
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- The number of atoms in 4.25g of NH(3) is approximately
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- Which amount of dioxygen (in grams) contains 1.8 xx 10^(22) molecules ...
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- The number of oxygen atoms in 4.4 g of CO(2) is approximately
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- The volume occupied by 4.4 g of CO(2) at STP is
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- The numbr of atoms in 0.1 mole of a triatomic gas is .(N(A)=6.02xx10^(...
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- The system thet contains the maximum number of atoms is
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- The number of water molecules is maximum in
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- The number of moles of BaCO(3) which contains 1.5 moles of oxygen atom...
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- The number of moles of oxygen in 1 L of air containing 21% oxygen by v...
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- If 1 ml of water contains 20 drops. Then no. of molecules in a drop of...
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- How many moles of lead (II) chloride will be formed from a reaction be...
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- Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at....
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- The empirical formula of an acid is CH(2)O(2), the probable molecular ...
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- A compound (80 g) on analysis gave C=24 g, H=4 g, O=32 g. Its empirica...
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