General Knowledge
CHEMISTRY MCQs
Total Questions : 1203
| Page 6 of 121 pages
Answer: Option C. -> Unpaired electrons
Paramagnetism is due to the presence of unpaired electrons in the material, so most atoms with incompletely filled atomic orbitals are paramagnetic, although exceptions such as copper exist.
Paramagnetism is due to the presence of unpaired electrons in the material, so most atoms with incompletely filled atomic orbitals are paramagnetic, although exceptions such as copper exist.
Answer: Option B. -> Face centered cubic
The structure of NaCl crystal is face centered cubic.
The structure of NaCl crystal is face centered cubic.
Answer: Option B. -> Ge
Zone refining is a very useful method to get metals with very high purity such as silicon and germanium. It is also referred to as zone melting, floating zone process, and travelling melting zone.
Zone refining is a very useful method to get metals with very high purity such as silicon and germanium. It is also referred to as zone melting, floating zone process, and travelling melting zone.
Answer: Option A. -> ethylene
Ethylene gas, acetylene gas liberated from calcium carbide, and ethephon are some of the commercial ripening agents used successfully in the trade and they have been widely studied for their effectiveness on initiating and accelerating the ripening process and their effect on fruit quality and health related issues. Green fruits are ripened by ethylene gas.
Ethylene gas, acetylene gas liberated from calcium carbide, and ethephon are some of the commercial ripening agents used successfully in the trade and they have been widely studied for their effectiveness on initiating and accelerating the ripening process and their effect on fruit quality and health related issues. Green fruits are ripened by ethylene gas.
Answer: Option A. -> its high electro negativity
The high reactivity of fluorine is due to its high electronegativity.
The high reactivity of fluorine is due to its high electronegativity.
Answer: Option A. -> cineole
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is cineole.
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is cineole.
Answer: Option B. -> HF
HF has the highest percentage of ionic character because F has the greatest electronegativity. F, Cl, I, and Br are all in the same group so that means their electronegativity (and thus percentage of ionic character) decreases as they go down the group in the periodic table.
HF has the highest percentage of ionic character because F has the greatest electronegativity. F, Cl, I, and Br are all in the same group so that means their electronegativity (and thus percentage of ionic character) decreases as they go down the group in the periodic table.
Answer: Option C. -> diamond
The allotropes of carbon include graphite, one of the softest known substances, and diamond, the hardest naturally occurring substance.
The allotropes of carbon include graphite, one of the softest known substances, and diamond, the hardest naturally occurring substance.
Answer: Option A. -> bauxite
Bauxite is the most common aluminum ore.
Bauxite is the most common aluminum ore.
Answer: Option A. -> luminous zone
The hottest part of the gas flame is known as luminous zone.
The hottest part of the gas flame is known as luminous zone.
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