Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
123
What is the most stable oxidation state of Vanadium?
Vanadium exhibits multiple oxidation states, but its most stable state is +5, commonly found in vanadates. This state is particularly stable due to the full utilization of its valence electrons. The stability of V+5 surpasses other oxidation states like V+2, V+3, and V+4.
124
The product On the oxidation of 2°Alcohol is ________?
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
126
What type of compounds are formed by non-stoichiometric transition elements?
Non-stoichiometric compounds of transition elements are formed when metal atoms occupy the interstitial spaces in a crystal lattice, leading to the creation of interstitial compounds. This type of compound has a variable composition, unlike stoichiometric compounds which have a fixed ratio of elements.
127
Which of the following is used to clean metals and bricks?
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
128
Inner transition elements are called _________________?
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
130
Which substance was historically added to gasoline to prevent engine knocking?
Tetraethyl lead (TEL) was widely used as an antiknock agent in gasoline to increase the octane rating and prevent premature ignition (knocking) in internal combustion engines. Due to its toxicity and environmental impact, it has been largely phased out in favor of safer alternatives.
