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Chemistry MCQs for NEET — Practice Questions with Answers

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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 ?

A. $ X = K_2MnO_4 , Y = MnO_2 , Z = KMnO_4 $ B. $ X = K_2MnO_4 , Y = MnO_4 , Z = KMnO_4 $ C. $ X = MnO_2 , Y = K_2 MnO_4 , Z = KMnO_4 $ D. $ X = MnO_2 , Y = KMnO_4 MnO_4 , Z = K_2 MnO_4 $

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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 ?

A. 1:1 B. 2:1 C. 1:2 D. 2:2

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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 ?

A. 1:1:1:1 B. 1:2:2:1 C. 1:1:2:2 D. 2:2:1:1

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

A. As reducing agent B. As corrosion inhibitors C. As decolouring agent in textile industry D. In preparation ofazo compound

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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.

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Which of following is used in dry cell ?

A. $ KMnO_4 $ B. $ MnO_2 $ C. $ K_2 Cr_2 O_7 $ D. $ K_2 MnO_2 $

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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.

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Which of alloy is used to fill dental cavities ?

A. Sodium amalgam B. Zinc chloride C. Mercury D. Mercury Amalgam

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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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Which of following is used as gernlicide

A. $ K_2Cr_2O_7 $ B. $ KMnO_4 $ C. $ FeSO_4 $ D. $ K_2MnO_4 $

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Explanation

Potassium permanganate ($KMnO_4$) is used as a germicide due to its strong oxidizing properties. It can kill bacteria and fungi by oxidizing their cellular components, making it an effective disinfectant.

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Which of general symbol is used to represent Lanthanoides ?

A. Ln B. La C. Le D. Li

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Explanation

The general symbol 'Ln' is used to represent Lanthanoides. Lanthanoides are a series of 15 metallic elements from lanthanum (La) to lutetium (Lu) in the periodic table, and the symbol 'Ln' is used as a shorthand for this group.

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Which of following element has very close similarity with Lanthanoides ?

A. Lr B. Ce C. Lu D. La

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What is electronic configuration of Ce ï€¨Z ï€½ 58ï€©

A. $ [Xe ] 4f^2 5d^o 6s^2 $ B. $ [Xe] 4f^1 5d^1 6s^2 $ C. $ [Xe] 5d^2 6s^2 $ D. $ [Xe] 4f^2 5d^1 6s^1 $

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Explanation

The electronic configuration of Cerium (Ce) with atomic number 58 is $ [Xe] 4f^1 5d^1 6s^2 $. This configuration accounts for the distribution of electrons in the respective orbitals following the Aufbau principle.

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