CBSE Class 10th...

When ester is treated with an alkali, the reaction gives ethanol and sodium ethanoate. This reaction is called

\(2KBr+BaI_2\longrightarrow\) \(2KI+BaBr_2\)

This reaction is a type of :

Assertion(A): Genes control characteristics or traits.

Reason(R): A section of DNA that provides information for one protein is called the gene for that protein, and proteins control the characteristics.

Assertion(A): Acquired trait cannot be passed to progeny, while inherited traits can be.

Reason(R): Acquired trait do not bring changes in the DNA of germ cell instead bring in somatic cells, while genes of inherited traits are present in DNA of germ cell.

Assertion(A): Copper oxide in a beaker is added with dilute HCl when copper (II) chloride is formed.

Reason(R): The colour of solution becomes brown and the copper oxide dissolves.

Baking soda is prepared by the which of the following process ?

The increase in the contaminated substances caused by the intoxicating environment is called :

All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

\(Acid+base\longrightarrow......+Water\)

All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

Bases generate ........ ions in water

All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

A number representing hydronium ion concentration indicating the acidic or basic nature of solution as:

All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

Decrease in \(H^+\) ion concentration indicates

All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

Blood is:

Sexual reproduction gives rise to more viable ........ then asexual reproduction.

Urine originates in ........ .

The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid.

Elements in the middle of periodic table, is classified as metalloid because:

The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid.

Metals on the left-hand side are reactive because

The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid.

Metallic character .....  across a period as one goes from left to right

The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid. 

Oxides of metals are ...... and that of non- metals are ...... in general.

The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid. 

Non- metals are electronegative because:

Ozone layer is found in......  

Electromagnetic induction is the production of an electromotive force across a conductor when it is exposed to a varying........

At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire

In our country, the potential difference between live and neutral wires is: -

At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire

The insulation cover of live wire is of which colour?

At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire

The insulation cover of neutral wire is of which colour?

At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire.

The insulation cover of earth wire is of which colour?

At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire.

Why is the metallic body of an appliance connected to the earth wire?

A device which works on the principle of the magnetic effect of current is :

The series arrangement is not used for domestic circuits because :

During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

ATP molecule is made from

During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

Energy equivalent to ......... is released when an ATP molecule is broken

During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

How many carbons are there in a pyruvate molecule?

During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

An example of a micro-organism where pyruvate is converted into \(C_2H_5OH\) and \(CO_2\) during fermentation is:

During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

Breakdown of pyruvate into \(CO_2\) using oxygen takes place in:

Various roles played by decomposers in the ecosystem are :

Various pigments found in plants are :