Students and Teachers Forum
Solution : Area A = l * b , where l = length and b = .....
Sodium bisulphate (NaHSO4) is formed by incomplete replacement of H+ of sulphuric acid (H2SO4) by a base. H2SO4 + NaOH ———> NaHSO4 + H2O It further reacts with base to form normal .....
We knew know that gravitational force is force between any two object by virtue of their masses. and gravity is force exerted by heavenly object such as planet, stars to objects near them. So, gravity and gravitational force mean the same .....
Human Resources are those who utilise financial and natural resources during development activities. Financial and natural resources are wasted if there is unavailability of human resources. Some of the strategies that may be utilised for .....
A quantity having both magnitude and direction is called vector quantity. Acceleration is a vector quantity because it has both magnitude and direction. When an object has a negative acceleration (it's slowing down), .....
A body is said to be non uniform when it covers unequal distance in unequal intervals of time .....
We can't feel the atmospheric pressure because our body is full of air also .The pressure inside lungs,blood vessels and several .....
Atmospheric pressure is the air pressure which is exerted by the weight of air present in the atmosphere. Atmospheric pressure is due to the weight of air present in the atmosphere above us. Atmospheric pressure also acts in all .....
A cooperative is an autonomous association of persons united voluntarily to meet their common economic, social, and cultural needs and aspirations. It is a jointly-owned and democratically-controlled enterprise. A cooperative is a private business .....
We know that notes are the mode of financial transactions between multiple parties. In today's world notes are widely used in transactions. But, due to dirty notes causes many problems. Some of the importance of clean notes are: notes also .....
In context of Nepal, family is defined as the relatives who share a common ancestor. Family is important for the following reason: for love, care and support for development of each individual member for physical and mental well .....
A plant is a living thing that grows in the earth and has a stem, leaves, and .....
Financial instruments are documents detailing the issuing of assets that can be traded and are considered binding. Financial instruments represent the issuing of investments in the form of financial assets and liabilities, as well as equity. It .....
Acids are said to be proton donors because they lose proton to other atoms in chemical reaction. This makes them more electronegative substance as they will have more number of electrons than .....
1. When water dissociates, it can form hydroxide, for example, NaOH. And it is pretty clear that NaOH is a base, which consists of OH group, which was received from water. 2. The water can also donate its H+ ion, making it an acid according to .....
Sodium bisulphate (NaHSO4) is formed by incomplete replacement of H+ of sulphuric acid (H2SO4) by a base. H2SO4 + NaOH ———> NaHSO4 + H2O It further reacts with base to form normal .....
HCl is a strong acid because it has more number of hydrogen ions HCl is a strong acid because when it is desolve in water then it dissociates .....
Organic acids are organic compounds that can act as acids. Organic acids essentially contain hydrogen and carbon with another element/s. Most common organic acids are acetic acid, lactic acid, citric acid, formic acid, etc. Inorganic acids are the .....
The difference between alkali and base are as follows:
Bases Alkali All metallic oxides are known as .....
Strong Acid
Weak Acid
It under goes almost complete ionization to give more concentration of hydrogen.
It undergoes very less ionization to give less concentration of .....
Area of square A = l2 where, l = length of the .....
Solution : length l = 5 feet Area A = ? We know, A = l2 = ( 5 feet )2 = 25 feet2 The Area of square is 25 .....
Physical change is called a temporary change because no new substance is formed and the chemical composition of the new substance is also .....
Glycerin acts as a negative catalyst as it decreases the rate of reaction during the decomposition of hydrogen peroxide into water and oxygen.
2H2O2 →MnO2 2H2O + .....
The characteristics of catalyst are : i. The mass and chemical nature of the catalyst does not change during the chemical reaction. ii. A catalyst does not initiate the chemical change. iii. A catalyst increases or decreases the rate of chemical .....
The reaction in which acid and base react to give salt and water is called acid and base reaction.
For Eg:
NaOH + HCl → NaCl + .....
There are 4 types of chemical reaction mainly. They are as follows:
a. Addition or Combination reaction. Examples: Sodium combines with chlorine to form sodium chloride. 2Na + Cl2 → 2NaCl When iron fillings are heated with .....
अनारको बोट कथाको सारांश र बुँदाटिपोट सुन्दर गाउँमा कल्पलता नाम गरेकी आमा बस्थिन् । उनको .....
The conditions required for chemical reaction are :
a. Simple Contact: When two elements are brought in contact they react. This is the simple condition under which chemical reaction takes place.
2Na + .....
प्रतीकः .....
Distance is a scalar quantity because it only has a magnitude and no direction. Distance is just the length of the .....
A transformer is used to bring voltage up or down in an AC electrical circuit. A transformer can be used to convert AC power to DC power. Transformers are employed for widely varying .....
Acceleration due to gravity doesn not depend upon the state of a body , either it is in rest or in motion state. Formula for acceleration due to gravity g = GM/R2 where R = radius of planet or .....
The development of nation depends on the proper utilization of natural, human and economic resources. Lack or the insufficient supply of any of the above-mentioned features hinders the process of development. Lack of economic resources affects the .....
The capital city of France is .....
The differences between natural and human resources are as .....
Metre is the fundamental unit. Length is a single dimentional quantity. So, metre is used to express unit of .....
The chemical reaction which absorbs heat during the chemical change is called endothermic reaction. Example 2KClO3 + Heat → 2KCl + .....
Laika, was the first dog to go to space .....
Temperate region lies between 30o to 60o latitudes on the both sides of the equator. The temperature is neither too hor nor too cold. Various kinds of cash crops and cash crops are grown here besides rearing various kinds of domesticated .....
The elements of the second group (Be, Mg, Ca and so on) are also metals. They are reactive but lesser than the alkali metals. Their oxides dissolve slightly in water and form weaker alkali. They are found readily on the .....