The element common to all acids is ? -Science-7

The element common to all acids is ? -Science-7
by

1 Answer

Answer :

The element common to all acid is Hydrogen. Example :- HCL= Hydrogen + Chlorine.
by

Related questions

Which of the following is an acid base indicator.... a)Vinegar b)Baking soda c)Litmus d)Common salt -Science-7

Description : Which of the following is an acid base indicator.... a)Vinegar b)Baking soda c)Litmus d)Common salt -Science-7

Last Answer : c) Litmus is a acid-base indiactor.

Burning of LPG in presence of air is a ____ change. -Science-7

Description : Burning of LPG in presence of air is a ____ change. -Science-7

Last Answer : Burning of LPG in presence of air is a Chemical change.

In a flowering plant male gamete is formed inside _____ -Science-7

Description : In a flowering plant male gamete is formed inside _____ -Science-7

Last Answer : In a flowering plant male gamete is formed inside anther.

Scraping is the mode of nutrition in _____ . -Science-7

Description : Scraping is the mode of nutrition in _____ . -Science-7

Last Answer : Scraping is the mode of nutrition in Snails.

Important diet in herbivore animals are ______. -Science-7

Description : Important diet in herbivore animals are ______. -Science-7

Last Answer : Important diet in herbivore animals is Cellulose.

Some plants like Xanthium have seeds with hooks for -Science-7

Description : Some plants like Xanthium have seeds with hooks for -Science-7

Last Answer : Plants like Xanthium have seeds with hooks for Dispersion of seed.

Identify the mode of reproduction in the figure given below.... -Science-7

Description : Identify the mode of reproduction in the figure given below.... -Science-7

Last Answer : This mode of reproduction is called Fragmentation.

Products of neutralization reaction are always -Science-7

Description : Products of neutralization reaction are always -Science-7

Last Answer : Products of neutralization reaction are always a salt and water.

How many molar teeth are present in the upper jaw in adult humans. -Science-7

Description : How many molar teeth are present in the upper jaw in adult humans. -Science-7

Last Answer : There are 6 molar teeth present in the upper jaw in adult humans.

The process by which faecal matter is removed through the anus is called ? -Science-7

Description : The process by which faecal matter is removed through the anus is called ? -Science-7

Last Answer : The process by which faecal matter is removed through the anus is called Egestion.

Phenopthalein indicator gives a pink color when the solution is ______ . -Science-7

Description : Phenopthalein indicator gives a pink color when the solution is ______ . -Science-7

Last Answer : Phenopthalein indicator gives a pink color when the solution is Basic solution.

Lime water is prepared by combining _______ and _______. -Science-7

Description : Lime water is prepared by combining _______ and _______. -Science-7

Last Answer : Lime water is Calcium Hydroxide . It is prepared by mixing Calcium oxide and Water.

A chemical change may involve -Science-7

Description : A chemical change may involve -Science-7

Last Answer : 4. Any or all of the above is correct.

Which of the following statements are incorrect ?a)Photosynthesis is a chemical change b) Digestion is a chemical change c)Formation of manure from vegetable was ... -Science-7

Description : Which of the following statements are incorrect ?a)Photosynthesis is a chemical change b) Digestion is a chemical change c)Formation of manure from vegetable was ... -Science-7

Last Answer : Option d) Iron and rust are the same substance. Iron and rust are different substances. Iron : Fe and Rust :

_______ acid is found in fruits obtained from plants. -Science-7

Description : _______ acid is found in fruits obtained from plants. -Science-7

Last Answer : Tartaric Acid is found in fruits obtained from plants.

Give reasons : Air conditioners should be installed at the top window. -Science-7

Description : Give reasons : Air conditioners should be installed at the top window. -Science-7

Last Answer : As a fact that warm air is much lighter than the cold air, so being heavier the cold air from air conditioner moves downwards while the hot air moves upwards and gets cooled and come downwards once again and cools the room.

Why scouring of the wool is necessary step during the processing of wool? -Science-7

Description : Why scouring of the wool is necessary step during the processing of wool? -Science-7

Last Answer : Scouring is an important step in wool processing. During the growth of the wool fibre it becomes coated with grease, salt and contaminated with dirt, dust and other matter. So to remove these types of matter scouring is important

Write two conditions that are necessary for conduction of heat. -Science-7

Description : Write two conditions that are necessary for conduction of heat. -Science-7

Last Answer : (i) The two objects should be in direct contact with each other. (ii) The temperature of the two objects should be different. Heat will flow only from a hotter object to a cooler object.

What is Symbiosis? -Science-7

Description : What is Symbiosis? -Science-7

Last Answer : It is the mode of nutrition where two organisms live together for mutual benefit. For example, lichens.

Name any two effects of electric current. -Science-7

Description : Name any two effects of electric current. -Science-7

Last Answer : Electric current have the following effects: 1. Electric current can give rise to heating and lighting. 2. Electric current can convert a straight conductor into a temporary magnet.

Explain why burning of wood and cutting it into small pieces are considered as two different types of changes. -Science-7

Description : Explain why burning of wood and cutting it into small pieces are considered as two different types of changes. -Science-7

Last Answer : Burning of wood is a chemical change because in burning new substances are formed as Wood + Oxygen = Charcoal + Carbon dioxide + Heat + Light But cutting it into small pieces is physical change because no new substance is formed. We can only reduce the size of wood.

Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy? -Science-7

Description : Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy? -Science-7

Last Answer : Woollen shawl

Silk production involves the cultivation of -Science-7

Description : Silk production involves the cultivation of -Science-7

Last Answer : Mulberry trees

Name the source from which litmus solution is obtained. -Science-7

Description : Name the source from which litmus solution is obtained. -Science-7

Last Answer : Litmus solution is obtained from Lichens

Which medicines are used for treating indigestion? -Science-7

Description : Which medicines are used for treating indigestion? -Science-7

Last Answer : antacids are used for treating indigestions

Sodium bicarbonate is commonly called -Science-7

Description : Sodium bicarbonate is commonly called -Science-7

Last Answer : Baking soda is the answer

Explain why rusting of iron objects is faster in coastal areas than in deserts. -Science-7

Description : Explain why rusting of iron objects is faster in coastal areas than in deserts. -Science-7

Last Answer : As content of moisture in the air in coastal areas is higher than in the air in deserts. So, the process of rusting is faster in coastal areas.

Explain how painting of an iron gate prevents it from rusting? -Science-7

Description : Explain how painting of an iron gate prevents it from rusting? -Science-7

Last Answer : The presence of oxygen and moisture is essential for rusting to occur. Painting prevents the iron gate from coming in contact with oxygen and moisture, hence prevents rusting.

Describe how crystals of copper sulphate are prepared. -Science-7

Description : Describe how crystals of copper sulphate are prepared. -Science-7

Last Answer : Take a cupful of water in a beaker and add a few drops of dilute sulphuric acid. Heat the water. When it starts boiling, add copper sulphate powder slowly. Continue to add copper sulphate powder ... to cool without disturbing the solution. After some time, we can see the crystals of copper sulphate.

How would you show that setting of a curd is a chemical change? -Science-7

Description : How would you show that setting of a curd is a chemical change? -Science-7

Last Answer : We can say that setting of curd is a chemical change because we can not get the original substance, i.e., milk back and a new substance is formed with different taste, smell and other chemical properties

When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place. -Science-7

Description : When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place. -Science-7

Last Answer : When a candle burns, both physical and chemical changes occur: (i) Physical change: melting of wax, vapourisation of melted wax. (ii) Chemical change: Burning of vapours of wax to give carbon ... and is converted from liquid to gaseous state and a chemical change occurs when gas burns in air.

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain. -Science-7

Description : When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain. -Science-7

Last Answer : The reaction between baking soda and lemon juice can be given as below: Lemon juice + Baking soda ----- C02 (bubbles) + Other substances (Citric acid) (Sodium hydrogen carbonate) (Carbon dioxide) It is a chemical change, because in this change new substances are formed.

Two methods by which rusting of iron can be prevented are __________ and __________ -Science-7

Description : Two methods by which rusting of iron can be prevented are __________ and __________ -Science-7

Last Answer : painting or greasing, galvanisation

Name some fruit bearing plants. Now make a table and describe the method of seed dispersal in these fruits as well as the agent which helps in the seed dispersal. -Science-7

Description : Name some fruit bearing plants. Now make a table and describe the method of seed dispersal in these fruits as well as the agent which helps in the seed dispersal. -Science-7

Last Answer : Some agent always disperses seeds, either it's external actor self or internal sometimes. First fruit we consider as 1) Dipterocarpus - By wind-Structures such as wings 2) Coconut- by water- fibrous covering 3 ... are there, and the method also varies, and it is due to this reason we get the fruits.

Cbqs (case base study ) of chapter 3 Fibre to Fabric class 7th -Science-7

Description : Cbqs (case base study ) of chapter 3 Fibre to Fabric class 7th -Science-7

Last Answer : Fibre to Fabric Class 7 Science Extra Questions Very Short Answer Type Question 1. Name the sources of obtaining fibres. The sources of obtaining fibres are plants and animals. Question 2. Name some ... from the cocoons of mulberry silk moth is called mulberry silk. Mulberry silk is soft, lustrou

Cbqs (case base study ) of chapter 2 Nutrition in animals class 7th -Science-7

Description : Cbqs (case base study ) of chapter 2 Nutrition in animals class 7th -Science-7

Last Answer : Nutrition in Animals Class 7 Science Extra Questions Very Short Answer Type Question 1. What is the total number of teeth in an adult human? In an adult human, there are total 32 teeth. ... they could go out and play during the recess. Suddenly, Boojho started coughing violently. Think of th

Cbqs (case base study ) of chapter 1 Nutrition in Plants 7th -Science-7

Description : Cbqs (case base study ) of chapter 1 Nutrition in Plants 7th -Science-7

Last Answer : Question 1. Potato and ginger are both underground parts that store food. Where is the food prepared in these plants? [NCERT Exemplar] Anwer: In both the plants, shoot system and leaves ... closed and insect is trapped. The liquid contains digestive enzymes which slowly digest the trapped insects.

Cbqs (case base study ) of chapter 4 Heat 7th -Science-7

Description : Cbqs (case base study ) of chapter 4 Heat 7th -Science-7

Last Answer : answer:

Write three precautions to be observed while using a clinical thermometer. -Science-7

Description : Write three precautions to be observed while using a clinical thermometer. -Science-7

Last Answer : Do not wash the thermometer with hot water. Ensure that before use the mercury level is below 35 ∘C. Read the thermometer keeping the level of mercury along the line of sight. Handle the thermometer with care, as you handle any glass articles.

Explain why woolen garments keeps us warm in winter? -Science-7

Description : Explain why woolen garments keeps us warm in winter? -Science-7

Last Answer : Woollen garments are made of wool which traps air in the spaces presen . Since air is poor conductor of heat the fibre keep us warm in winter.

Why scouring of wool is a necessary step during the processing of wool? -Science-7

Description : Why scouring of wool is a necessary step during the processing of wool? -Science-7

Last Answer : Scouring is an important step because in this dirt, sand, grease etc. are removed from the wool .This makes the wool suitable for making fabric.

What is silk? -Science-7

Description : What is silk? -Science-7

Last Answer : It is a natural fibre made from the cocoons of silkworms.

What is wool? -Science-7

Description : What is wool? -Science-7

Last Answer : It is a natural fibre obtained from the fleece of sheep ,rabbits, goat and camel.

Name the process by which silk and wool fibres are made into fabric. -Science-7

Description : Name the process by which silk and wool fibres are made into fabric. -Science-7

Last Answer : Wool and Silk are made into fabric by the process of weaving.

Name the four stages in the lifecycle of a silk moth. Explain each stage. -Science-7

Description : Name the four stages in the lifecycle of a silk moth. Explain each stage. -Science-7

Last Answer : Silk moth is a large white insect .The different stages in the life cycle of silk moth are- Egg- it is the first stage of the life cycle .The female moth lays its eggs during the summer.The egg ... changes into a moth which comes out of the cocoon. The female adults lay egg and the cycle continues.

Define Shearing. -Science-7

Description : Define Shearing. -Science-7

Last Answer : Shearing: It is a process of removing the fleece of the sheep along with a thin layer of its skin. Shearing is conducted generally in hot weather so that the sheep do not feel cold and can survive easily.

Define Sericulture. -Science-7

Description : Define Sericulture. -Science-7

Last Answer : Sericulture: is the breeding and raising of silkworms in order to obtain silk from them.

Sun is the ultimate source of energy . Explain it. -Science-7

Description : Sun is the ultimate source of energy . Explain it. -Science-7

Last Answer : Sun is the ultimate source of energy for all organisms, photosynthesis cannot take place in the absence of Sunlight. Solar energy is used to break water into hydrogen and oxygen .This hydrogen is combined with carbon dioxide to form food for the plants, which is ultimately used by animals as well.

How do plants get nitrogen to synthesis proteins? -Science-7

Description : How do plants get nitrogen to synthesis proteins? -Science-7

Last Answer : Plants can get nitrogen to synthesise protein by- 1) They modify some parts of their body such as apex of leaf and change themselves to become insectivorous plants. 2) Leguminous plants like- pea plants,etc. have rhisobium bacteria in their root nodules which also provide them nitrogen.

Why are green plants called autotrophs? -Science-7

Description : Why are green plants called autotrophs? -Science-7

Last Answer : The mode of nutrition in which organisms synthesizes their own food using inorganic materials is called autotrophic nutrition. Green plants use these inorganic materials to make their own food. Therefore they are called autotrophs.