Biology
Grade-8
Easy
Question
Radiometric dating is also known as __________ dating.
- Total
- Absolute
- Geological
- All are correct
Hint:
There are two methods of fossil dating - relative and absolute.
The correct answer is: Absolute
Absolute dating is the second method of fossil dating. Since it uses radioactive elements to determine the age of fossils, it is also known as radioactive dating.
Hence, absolute is the correct answer.
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A ____________ is a collection of fossils that have been studied and placed in taxonomic and chronological order.
A ____________ is a collection of fossils that have been studied and placed in taxonomic and chronological order.
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Identify the isotope which is shown in the below figure:
Identify the isotope which is shown in the below figure:
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In the Bosch process, the catalytic reduction of steam to Hydrogen is carried out by _____
In the Bosch process, the catalytic reduction of steam to Hydrogen is carried out by _____
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Read the following paragraph carefully and identify the P, Q, R and S from the following:
During an experiment, steam is passed over ____P___ at 1000oC in the furnace. As a result, the ___Q _____ gas is formed. This reaction is endothermic in nature. This Q gas, when combined with an excess of steam, ferric oxide and ____R___, it gives the products___ S____.
Read the following paragraph carefully and identify the P, Q, R and S from the following:
During an experiment, steam is passed over ____P___ at 1000oC in the furnace. As a result, the ___Q _____ gas is formed. This reaction is endothermic in nature. This Q gas, when combined with an excess of steam, ferric oxide and ____R___, it gives the products___ S____.
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When iron metal is taken in place of zinc for the laboratory preparation of Hydrogen, the volume of Hydrogen collected is lower. Identify the reason.
(i) Metal becomes passive due to the formation of a protective coating.
(ii) The formation of insoluble sulphate stops the further reaction.
(iii) There are impurities in the metal.
(iv) The reaction becomes reversible.
When iron metal is taken in place of zinc for the laboratory preparation of Hydrogen, the volume of Hydrogen collected is lower. Identify the reason.
(i) Metal becomes passive due to the formation of a protective coating.
(ii) The formation of insoluble sulphate stops the further reaction.
(iii) There are impurities in the metal.
(iv) The reaction becomes reversible.
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The correct conditions for the production of Hydrogen gas from the water gas are:
The correct conditions for the production of Hydrogen gas from the water gas are:
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In the laboratory preparation of Hydrogen, it is collected by downward displacement of water. It is also collected after all the air in the apparatus is allowed to escape because:
In the laboratory preparation of Hydrogen, it is collected by downward displacement of water. It is also collected after all the air in the apparatus is allowed to escape because:
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The most stable isotopes among all naturally occurring isotopes are:
The most stable isotopes among all naturally occurring isotopes are:
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A promoter used in the Bosch process:
A promoter used in the Bosch process:
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During the bosh process to prepare Hydrogen, some carbon dioxide is also obtained as a by-product. Write a chemical equation to remove this carbon dioxide by using caustic potash.
During the bosh process to prepare Hydrogen, some carbon dioxide is also obtained as a by-product. Write a chemical equation to remove this carbon dioxide by using caustic potash.
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During the preparation of Hydrogen by the laboratory method. Arrange these steps in proper order.
1. Fix a two-holed airtight stopper in the mouth of the flask.
2. Take a few pieces of granulated zinc pieces in rare taken in a flat-bottomed flask
3. Pass a thistle funnel through one hole and pass one end of the delivery tube through the other hole.
4. Now pour some dilute hydrochloric acid through the thistle funnel.
Place another end of the delivery tube inside the beehive shelf kept in a water trough.
During the preparation of Hydrogen by the laboratory method. Arrange these steps in proper order.
1. Fix a two-holed airtight stopper in the mouth of the flask.
2. Take a few pieces of granulated zinc pieces in rare taken in a flat-bottomed flask
3. Pass a thistle funnel through one hole and pass one end of the delivery tube through the other hole.
4. Now pour some dilute hydrochloric acid through the thistle funnel.
Place another end of the delivery tube inside the beehive shelf kept in a water trough.
ChemistryGrade-8
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State whether the following are true or false.
(i). Hydrogen is the most abundant element in the universe but is only available in very few quantities.
(ii). Commercially the hydrogen gas can be prepared by electrolysis of water.
(iii). The Bosch process can also prepare Hydrogen from natural gas, which contains ethane as the main ingredient.
State whether the following are true or false.
(i). Hydrogen is the most abundant element in the universe but is only available in very few quantities.
(ii). Commercially the hydrogen gas can be prepared by electrolysis of water.
(iii). The Bosch process can also prepare Hydrogen from natural gas, which contains ethane as the main ingredient.
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Dry Hydrogen is collected by downward displacement as it is:
Dry Hydrogen is collected by downward displacement as it is:
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Which scientist first prepared the Hydrogen gas?
Which scientist first prepared the Hydrogen gas?
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Identify the least stable isotopes from all synthesized isotopes shown the below:
Identify the least stable isotopes from all synthesized isotopes shown the below:
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