Chemistry Practice Question and Answer
8 Q: Which non-metal is liquid at room temperature?
1120 06127640793f02206607ee962
6127640793f02206607ee962- 1mercuryfalse
- 2aluminumfalse
- 3Brominetrue
- 4Copperfalse
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Answer : 3. "Bromine"
Q: Alpha particles are ___________.
1115 062f33ba13342ab1184379169
62f33ba13342ab1184379169- 1twice the mass of beta particlesfalse
- 2negatively chargedfalse
- 3just like helium nucleitrue
- 4lower in ionizing power as compared to gamma raysfalse
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Answer : 3. "just like helium nuclei"
Q: Which of the following elements is NOT a component of baking soda?
1112 164bfc857a2d4dcaf044da339
64bfc857a2d4dcaf044da339- 1Hydrogenfalse
- 2Calciumfalse
- 3Sodiumfalse
- 4Oxygentrue
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Answer : 4. "Oxygen"
Explanation :
1. Which of the following calcium elements is not a component of baking soda?
2. The chemical formula of baking soda is NaHCO3, which is composed of four elements sodium, hydrogen, carbon and oxygen.
3. Baking soda is an alkaline substance used as a leavening agent in baking.
Q: Which law was studied in the year 1787, in which it was said that the volume of a gas increases with its absolute temperature and if its absolute temperature decreases, then its volume will decrease?
1108 064b5204188d5e4f52dd2277b
64b5204188d5e4f52dd2277b- 1Boyle’s lawfalse
- 2Dalton’s lawfalse
- 3Avogadro’s lawfalse
- 4Charles's lawtrue
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Answer : 4. "Charles's law"
Explanation :
1. Charles's law (also known as volume law) is an experimental gas law.
2. The volume of a gas increases with its absolute temperature and as its absolute temperature decreases its volume also decreases.
3. Charles's law was studied in the year 1787.
Q: Which of the following process is used to do maximum work done on the ideal gas if the gas is compressed to half of its initial volume?
1106 063c920deb338bc336f0dd8d6
63c920deb338bc336f0dd8d6- 1Isothermalfalse
- 2Isochoricfalse
- 3Isobaricfalse
- 4Adiabatictrue
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Answer : 4. "Adiabatic"
Q: A radio-active substance has a half life of six months. Three-fourth of the substance will decay in____.
1105 05f48d6b3e7f09063e630a3d9
5f48d6b3e7f09063e630a3d9- 1Six monthsfalse
- 2Ten monthsfalse
- 3Twelve monthstrue
- 4Twenty four monthsfalse
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Answer : 3. "Twelve months"
Q: In 1931, who recognised that an aromatic compound must have an odd number of pairs of electrons, which can mathematically be written as 4n+2 (n = 0,1,2,3 etc.)?
1105 0647de965e72c4684a1dcb8b3
647de965e72c4684a1dcb8b3- 1Jacob Berzeliusfalse
- 2Erich Huckeltrue
- 3Antoine Lavoisierfalse
- 4Auguste Laurentfalse
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Answer : 2. "Erich Huckel"
Q: Which of the following reactions always have pairs together?
1104 05f698f46558d255013b2b2b6
5f698f46558d255013b2b2b6- 1combination and dissolutionfalse
- 2precipitation and displacementfalse
- 3neutralization and displacementfalse
- 4Oxidation and degradationtrue
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