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100 mL of $PH_3$ on heating forms P and $H_2$ . The volume change in the reaction is
$ 2PH_{3_{(g)}} \rightarrow 2P_{(s)} + 3H_{2_{(g)}} $ 2mL 3mL $ \therefore 100ml (?) $ = { 100 \times 3 \over 2 } = 150ml $ $ \therefore Increase = 50mL $
An organic compound made of C, H, and N contains 20% nitrogen. Its molecular weight is (WBJEE 2009)
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 ?
$ Ag_2S $ Ag ore $ Ag_2 S $ 248g 216g 100g 1.24g (?) $ \therefore1.0g (?) 1.148g = 1.148g $ = 92.58 \approx 92.6 g $
Find the electric charge in coulumb of 9.0 gm of $ Al ^ {3+} $ ions.
$ 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
Which of the following is not a homogeneous mixture ?
27 g of Al (at mass = 27) will react with oxygen equal to (IIT 1978)
Which of the following pairs of substances illustrates the law of multiple proportions ?
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‚‚.
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.
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.
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 : In the equation $ NH_ 3 + HCl \rightarrow NH_4 Cl, , Gay-Lussac’s law is not applicable to NH_4Cl $ . R : $ NH_4Cl$ is not a gas,.
Gay-Lussac's law states that gases combine or are produced in volumes that bear a simple ratio to one another. Since NH4Cl is a solid, not a gas, Gay-Lussac's law is not applicable to it. Both the assertion and reason are correct, and the reason correctly explains the assertion.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.