Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following vitamins is synthesized by the bacteria of the gut?
The text states, 'However, the bacteria of the gut can produce some of the vitamins required by us.'
The precursor term 'Vitamine' was eventually shortened to 'Vitamin' because:
The NCERT text clarifies, 'Later work showed that most of them did not contain amino groups, so the letter ‘e’ was dropped and the term vitamin is used these days.'
A person suffering from bleeding gums and slow wound healing would likely be deficient in which vitamin?
Scurvy, characterized by bleeding gums, is listed as a deficiency disease of Vitamin C (Ascorbic acid) in Table 10.3. Vitamin C is crucial for collagen formation and wound healing.
Which of the following is a fat-soluble vitamin found in green leafy vegetables and plays a role in blood clotting?
Table 10.3 states that Vitamin K's source includes green leafy vegetables and its deficiency leads to 'Increased blood clotting time', confirming its role in blood clotting. The classification section also lists Vitamin K as fat-soluble.
Which of the following scientists first considered the idea of trends among properties of elements in the early 1800s?
The context states: 'The German chemist, Johann Dobereiner in early 1800’s was the first to consider the idea of trends among properties of elements.'
Dobereiner's Triads demonstrated that the atomic weight of the middle element in a triad was approximately:
According to the context: 'In each case, he noticed that the middle element of each of the triads had an atomic weight about halfway between the atomic weights of the other two' (Table 3.1 also exemplifies this).
Newlands's Law of Octaves was applicable primarily for elements up to which element?
The text mentions: 'Newlands’s Law of Octaves seemed to be true only for elements up to calcium.'
The Modern Periodic Law states that the physical and chemical properties of elements are periodic functions of their:
The context clearly defines the Modern Periodic Law: 'The physical and chemical properties of the elements are periodic functions of their atomic numbers.'
Who experimentally demonstrated that atomic number is a more fundamental property of an element than its atomic mass, leading to the modification of Mendeleev's Periodic Law?
The passage states: 'In 1913, the English physicist, Henry Moseley observed regularities in the characteristic X-ray spectra of the elements... He thereby showed that the atomic number is a more fundamental property of an element than its atomic mass.'
The Periodic Law, as it is understood today, is fundamentally a consequence of the periodic variation in:
The text says: 'In fact, it is now recognized that the Periodic Law is essentially the consequence of the periodic variation in electronic configurations, which indeed determine the physical and chemical properties of elements and their compounds.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.