Chemistry Practice Question and Answer
8 Q: A radio-active substance has a half life of six months. Three-fourth of the substance will decay in____.
1274 05f48d6b3e7f09063e630a3d9
5f48d6b3e7f09063e630a3d9- 1Six monthsfalse
- 2Ten monthsfalse
- 3Twelve monthstrue
- 4Twenty four monthsfalse
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Answer : 3. "Twelve months"
Q: Which of the following reactions always have pairs together?
1273 05f698f46558d255013b2b2b6
5f698f46558d255013b2b2b6- 1combination and dissolutionfalse
- 2precipitation and displacementfalse
- 3neutralization and displacementfalse
- 4Oxidation and degradationtrue
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Answer : 4. "Oxidation and degradation"
Q: Which compound is formed when copper is burnt in air?
1273 0612764bd93f02206607eefa2
612764bd93f02206607eefa2- 1copper hydroxidefalse
- 2copper hydridefalse
- 3Copper Oxidetrue
- 4nothingfalse
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Answer : 3. "Copper Oxide"
Q: Hydrogen resembles the properties of which two groups of the periodic table?
1270 064a2b0fac7d7c7e0674a2640
64a2b0fac7d7c7e0674a2640- 1Group 2 and Group 17false
- 2Group 1 and Group 3false
- 3Group 1 and Group 17true
- 4Group 2 and Group 4false
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Answer : 3. "Group 1 and Group 17"
Explanation :
1. Hydrogen matches the properties of the first group and seventh group of the periodic table.
2. Following is some additional information about the properties of hydrogen.
- Hydrogen is a highly flammable gas.
-Hydrogen is a major component of water.
- Hydrogen can be used as fuel.
Hydrogen is used in the chemical industry to make many types of products.
Q: On heating copper powder in air, a layer of copper oxide accumulates on its surface. What is the color of this layer?
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5f697a06f9079a64e3a50c7f- 1Blacktrue
- 2Whitefalse
- 3Yellowfalse
- 4Brownfalse
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Answer : 1. "Black"
Q: Water in case of HCl acts as a/an ___________, in case of ammonia acts as a/an ________
1264 063c7c8d3be373f6c9546a490
63c7c8d3be373f6c9546a490- 1Base, basefalse
- 2Base, acidtrue
- 3Acid, basefalse
- 4Acid, acidfalse
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Answer : 2. "Base, acid "
Q: What type of chemical reaction is combustion of natural gas?
1260 05f6979af558d255013b234b3
5f6979af558d255013b234b3- 1combination reactionfalse
- 2decomposition reactionfalse
- 3exothermic reactiontrue
- 4dissolution reactionfalse
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Answer : 3. "exothermic reaction"
Q: In which process is a protective zinc coating applied on iron to prevent it from rusting?
1260 060927508cc29175f0f879192
60927508cc29175f0f879192- 1Galvanisationtrue
- 2Annealingfalse
- 3Smeltingfalse
- 4Weldingfalse
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