Rechargeable zinc–air battery with vitamin B12 catalyst – Quiz (13.11.2026)

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Rechargeable zinc–air battery with vitamin B12 catalyst – Quiz (13.11.2026) – 5 questions, subject: Current Affairs. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
Which metal ion lies at the centre of the vitamin B12 molecule?

Correct Answer: D [Cobalt]

Explanation:

Cobalt – hence the name cobalamin. Haemoglobin has iron at its core and chlorophyll has magnesium.

2.  
How does a catalyst speed up a chemical reaction?

Correct Answer: D [Lowers activation energy]

Explanation:

It offers an alternative pathway with lower activation energy and stays unchanged; it alters neither the equilibrium nor the reaction enthalpy.

3.  
In a zinc–air battery, which gas drawn from the surroundings reacts at the air electrode?

Correct Answer: A [Oxygen]

Explanation:

Oxygen – it is reduced to water on discharge and released again on charging. Zinc serves as the anode.

4.  
Which Tamil Nadu institution said in 2022 it was developing zinc–air EV batteries with swappable 'zinc cassettes'?

Correct Answer: C [IIT Madras]

Explanation:

IIT Madras, Dept of Chemical Engineering (May 2022) – for two- and three-wheelers; it said the water-based electrolyte would not catch fire.

5.  
Who built the first electric battery in 1800 by stacking metal discs separated by brine-soaked cloth?

Correct Answer: A [Alessandro Volta]

Explanation:

Italy's Volta – the 'voltaic pile'; the unit volt is named after him. Planté invented the lead-acid cell (1859).

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