NEET Practice Questions (MCQs) with Answers & Solutions

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What will be the mole ratio of products in the given reaction ? $ Fe Cr_2 O_4 + Na_2 CO_3 + O_2 \rightarrow Na_2 CrO_4 + Fe_2 O_3 + CO_2 $

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$ Fe Cr_2 O_4 + Na_2 CO_3 + O_2 \rightarrow X + Y +CO_2 $ . Mention Xand Y

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Where potassium dichromate is used ?

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Explanation

Potassium dichromate ($K_2Cr_2O_7$) is primarily used in the leather industry for tanning leather. It helps in the conversion of raw hides into leather by stabilizing the collagen fibers, making them more durable and less susceptible to decomposition.

What is atomic volume of Au and Cu in 22 carrate gold ornaments ?

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$ X + KOH + O_2 \rightarrow Y + H_2O $
$ Y + H_2SO_4 + Z + K_2SO_4 + MnO_2 + H_2O$
What are X, Yand Zin above reactions ?

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$ K_2MnO_4 + H_2 SO_4 \rightarrow KMnO_4 + K_2SO_4 + MnO_2 + H_2O $ What will be mole ratio of products in above reaction ?

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$ K_2MnO_4 + H_2 SO_4 \rightarrow KMnO_4 + K_2SO_4 + MnO_2 + H_2O $ What will be mole ratio of products in above reaction ?

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Potassium permangnate is used as ...............

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Explanation

Potassium permanganate ($KMnO_4$) is commonly used as a decolourizing agent in the textile industry. It acts as a strong oxidizing agent, which helps in bleaching and removing color from fabrics.

Which of following is used in dry cell ?

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Explanation

$MnO_2$ (Manganese dioxide) is used in dry cells, also known as Leclanche cells or zinc-carbon batteries. It acts as a depolarizer, which helps in maintaining a steady flow of electric current by preventing the buildup of hydrogen gas.

Which of alloy is used to fill dental cavities ?

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Explanation

Mercury amalgam is commonly used to fill dental cavities. This is because amalgam is durable, easy to manipulate, and resistant to moisture. It provides a strong, long-lasting filling for cavities.

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