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Chemistry MCQs for NEET — Practice Questions with Answers

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What is the difference of atomic radii of Au and Cu in 22 carate gold ?

A. 15% B. more than 15% C. less than 15% D. 24.50%

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Which alloy is used in preparation of coins ?

A. Brass B. Bronze C. German-Silver D. Nichrome

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Explanation

Bronze is an alloy that has been traditionally used for making coins. It is composed primarily of copper, usually with tin as the main additive. The properties of bronze, such as its hardness and resistance to corrosion, make it suitable for coinage.

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Which alloy is used in preparation of antiseptic?

Nitinol

Bronze

Cupronickle

German-Silver

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Where amalgum alloy is used ?

A. In electric heater B. In space research C. To make surgical appliaces D. In filling tooth cavity

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Explanation

Amalgam is an alloy that is commonly used in dentistry for filling cavities. It consists of mercury mixed with other metals such as silver, tin, and copper. Its durability and ease of manipulation make it ideal for dental repairs.

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Which of the following proportion of constituent is present in amalgam alloys ?

A. Hg (50%) Ag (35%) Sn (12%) Cu (3%) B. Hg (50%) Ag (35%) Sn (12%) Cu (3%) Zn (0.2%) C. Hg (50%) Ag (12%) Sn (35%) Cu (3%) Zn (0.2%) D. Hg (50%) Ag (35%) Sn (3%) Cu (12%)

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$ Fe Cr_2 O_4 + Na_2 CO_3+ O_2 $ mention which product is obtained ts ?

A. $ Na_2CrO_4 + Fe_3O_4 +CO_2 $ B. $ Na_2CrO_4 + Fe_2O_3 + CO_2 $ C. $Na_2Cr_2O_7 + Fe_2O_3 +CO_2 $ D. $ Na_2 Cr_2 O_7 + Fe_2O_3 + CO $

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Explanation

The reaction of iron chromite (FeCr2O4) with sodium carbonate (Na2CO3) and oxygen (O2) produces sodium chromate (Na2CrO4), iron(III) oxide (Fe2O3), and carbon dioxide (CO2). The balanced chemical equation is: $$ 4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 ightarrow 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2 $$

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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 $

A. 8:02:08 B. 8:04:08 C. 4:4:8 D. 8:02:06

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

A. $ X = Na_2 Cr_2 O_7 Y = Fe_3 O_4 $ B. $ X = Na_2 Cr O_4 Y = Fe_3 O_4 $ C. $ X = Na_2 Cr O_4 Y = Fe_2 O_3 $ D. $ X = Na_2 Cr_2 O_7 Y = Fe_2 O_3 $

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Where potassium dichromate is used ?

A. In leather industry B. In textile industry C. As germiside D. As bleaching agent in cotton cloths

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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.

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

A. 134 pm 118 pm B. 133 pm 118 pm C. 134 pm 117 pm D. 135 pm 117 pm

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