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Some Basic Concepts in Chemistry MCQs for NEET — Chemistry Questions with Answers

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For a reaction A + 2B ï‚® C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is

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Explanation

In the balanced chemical equation A + 2B → C, the stoichiometric coefficients indicate that 1 mole of A reacts with 2 moles of B to produce 1 mole of C. Given that the reaction starts with 5 moles of A and 8 moles of B, the limiting reactant is A (5 moles). Therefore, the maximum amount of C that can be formed is 4 moles.

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100 mL of $PH_3$ on heating forms P and $H_2$ . The volume change in the reaction is

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Explanation

$ 2PH_{3_{(g)}} \rightarrow 2P_{(s)} + 3H_{2_{(g)}} $ 2mL 3mL $ \therefore 100ml (?) $ = { 100 \times 3 \over 2 } = 150ml $ $ \therefore Increase = 50mL $

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An organic compound made of C, H, and N contains 20% nitrogen. Its molecular weight is (WBJEE 2009)

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An ore contains 1.24% of the mineral argentite $ Ag_2S$ by mass. How many grams of this ore would have to be processed in order to obtain 1.0 g of pure solid silver ?

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Explanation

$ Ag_2S $ Ag ore $ Ag_2 S $ 248g 216g 100g 1.24g (?) $ \therefore1.0g (?) 1.148g = 1.148g $ = 92.58 \approx 92.6 g $

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Find the electric charge in coulumb of 9.0 gm of $ Al ^ {3+} $ ions.

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Explanation

$ No. of moles of Al ^ {3+} = { 9 \over 27 } = 0.33 $ $ \therefore No. of Al ^ {3+} ions = 0.33 \times 6.022 \times 10 ^ {23} = 2 \times 10 ^ {23} $ $ \therefore Electric charge = 3 \times 1.602 \times 10 ^ {-19} \times 2 \times 10^ {23} = 9.6 \times 10 ^ {+4} $ Coulomb

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Which of the following is not a homogeneous mixture ?

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27 g of Al (at mass = 27) will react with oxygen equal to (IIT 1978)

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Which of the following pairs of substances illustrates the law of multiple proportions ?

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Explanation

The law of multiple proportions states that when two elements form more than one compound, the masses of one element that combine with a fixed mass of the other element are in a ratio of small whole numbers. This law is illustrated by the compounds CO and COâ‚‚.

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In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : Normality of 0.1M $ H_2SO_4$ is 0.2N. R : $ H_2SO_4 $ is a dibasic acid.

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In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : 1 Gram molecule of sulphar also represents 1 gram atom of sulphur. R : Atomicity of sulphur is one.

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