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let the mass of the compound be 100gm

% mass of potassium is 24.75% =24.75gmand % mass of manganese is 34.75% = 34.75gm

moles of potassium = 24.75/39 = 0.634and moles of manganese = 34.75/59 = 0.588 => ratio of K/Mn = 0.634/0.588 = 1.07≈1

so, emperical formula of compound is = (K)1(Mn)1

Carbon is used as a base for the ink in inkjet printers.

Carbon, in the form of carbon dioxide, is used in the manufacture of many fizzy and carbonated drinks. It is also used in fire extinguishers.

Dry ice, which is the solid form of carbon dioxide, is used as a cooling agent.

Freon, is used in cooling systems and devices like refrigerators and air conditioners.

Carbon is also used to manufacture many heat resistant devices and tools and metal cutters.

It is used as a decorative tool in many jewelry items.

Carbon monoxide, extracted through metallurgical process, is used as a reducing agent to obtain many elements and compounds.

Vegetal carbon, which is an amorphous form of carbon, is utilized as a bleaching agent and a gas absorbent.

Carbon is used in the rim of automobiles as a black fume pigment.

Calcium carbide is used as a welding agent for cutting metals, in the preparation of acetylene and other organic compounds.

thanks

all of these can form

Each Atom Can Make a Defined Number of Covalent Bonds

Electrons move around thenucleusof an atom in clouds calledorbitals,which lie in a series of concentricshells,or energy levels; electrons in outer shells have more energy than those in inner shells. Each shell has a maximum number of electrons that it can hold. Electrons fill the innermost shells of an atom first; then the outer shells. The energy level of an atom is lowest when all of its orbitals are filled, and an atom’s reactivity depends on how many electrons it needs to complete its outermost orbital. In most cases, in order to fill the outermost orbital, the electrons within it form covalent bonds with other atoms. Acovalent bondthus holds two atoms close together because electrons in their outermost orbitals are shared by both atoms.

Most of the molecules in living systems contain only six different atoms: hydrogen, carbon, nitrogen, phosphorus, oxygen, and sulfur. The outermost orbital of each atom has a characteristic number of electrons:

all of these form covalent bond

=> carbon is smaller than silicon thus carbon has the ability 2 make more branches in catenation=>bonds forms by carbon in catenation is much stronger than silicon

by cell when we eat something they enter our body

pathogens can enter our body by any means because it spread every where for example when someone sneeze it then a large amount of pathogens will enter to the nearby person by air

pathogens enter our body through the cuts and through our mouth and eyes or when we eat food they are sucked by us by the food

Microorganisms capable of causing disease—orpathogens—usuallyenter our bodiesthroughtheeyes, mouth, nose, or urogenital openings, or through wounds or bites that breachtheskin barrier. ... Contact: Some diseases spread via direct contact with infected skin, mucous membranes, orbodyfluids.

by cell when we eat something they it will enter our body

by cells is the correct answer of the given question

By cell when we eat something they enter our body is correct answer

Formula units per unit cell Z = 2 for BCCcubic unit cell lattice parameter a = 288 pm = 288 x10-8cmVolume V = a3=2.39X10^-23cm3Density d = 7.2g/cm3N­A = Avogadro constant = 6.022x10²³Molecular mass M =?We know thatDensity d = ZM/NA X a3M = dxNA x a3/ZOn Substituting valuesM= 7.2g/cm3x(6.022x10²³)X (6.022x10²³)/2= 51.8gmol-151.8 g of element contains 6.022X10^23208g of this element contains=?= 6.022X10^23X208/51.8=2.42X10^24atoms.

भौतिकीमें,ऊर्जावस्तुओंका एकगुणहै, जो अन्य वस्तुओं कोस्थानांतरितकिया जा सकता है याविभिन्न रूपोंमेंरूपांतरितकिया जा सकता हैं।[1]

किसी भी कार्यकर्ता केकार्यकरने की क्षमता कोऊर्जा(Energy) कहते हैं। ऊँचाई से गिरते हुए जल में ऊर्जा है क्योंकि उससे एक पहिये को घुमाया जा सकता है जिससे बिजली पैदा की जा सकती है।

ऊर्जा की सरल परिभाषा देना कठिन है। ऊर्जा वस्तु नहीं है। इसको हम देख नहीं सकते, यह कोई जगह नहीं घेरती, न इसकी कोई छाया ही पड़ती है। संक्षेप में, अन्य वस्तुओं की भाँति यहद्रव्यनहीं है, यद्यापि बहुधा द्रव्य से इसका घनिष्ठ संबंध रहता है। फिर भी इसका अस्तित्व उतना ही वास्तविक है जितना किसी अन्य वस्तु का और इस कारण कि किसी पिंड समुदाय में, जिसके ऊपर किसी बाहरी बल का प्रभाव नहीं रहता, इसकी मात्रा में कमी बेशी नहीं होती।

आयननऊर्जा -- इलेक्ट्रान को परमाणु से अलग करने के लिए आवश्यक आयनन ऊर्जा आयनन विभव या आयनन ऊर्जा कहलाती है

its due to lanthanide contraction.as the size of lanthanide ions decreses frm La3+ to Lu3+ , the covalent character of the hydroxides increases and hence thebasicstrength decreases.La(OH)3ismost basicandLu(OH)3is leastbasic.

TheHeisenberg uncertainty principle statesthat it is impossible to know simultaneously the exact position and momentum of a particle.

The Heisenberg uncertainty principle is a rule in quantum mechanics. It states that there is a fundamental limit to how well you can simultaneously know the position and momentum (where momentum is classically mass times velocity) of a particle. This means if you know the position very precisely, you can only have limited information about its momentum and vice-versa

Inquantum mechanics, theuncertainty principle(also known asHeisenberg's uncertainty principle) is any of a variety ofmathematical inequalitiesasserting a fundamental limit to the precision with which certain pairs of physical properties of aparticle, known ascomplementary variables or canonically conjugate variables such aspositionxandmomentump, can be known.

Molality

Molality involved a fixed mass of solvent.Hence,this is independent of temperature.

hey its not clear

Glass is sometimes called a supercooled liquid because it doesn't form a crystalline structure but instead forms an amorphous solid that allows molecules in the material to continue to move.

Glass is anamorphoussolid. It exhibits an atomic structure close to thatobservedin thesupercooled liquidphase but displays all the mechanical properties of a solid.

so the best option among the options is Option (B) super cooled liquid.

It's the dot and cross structure of SiCl4 hence option d) is correct.

5 moles of carbon di oxide

1.Hexamethylene diamine - NH2-(CH2)6-NH2 2. Adipic acid - COOH-(CH2) 4- COOH are the monomers of the given polymeric structure (nylon 6,6)

4 cm³ of hydrogen is left, so,According to question:

2 vol of H and 2 vol of Cl give 2 vol of HCltherefore, 16 cm³ of H and 16 vol of CL gives 32 cm³ of HClSo the composition-H= (16+4) cm³ = 20 cm³Cl= 16 cm³

thanks

9999999999999999999877765544322123456788999

9 9 9 9 7 7 7 7 6 6 6 8 5 4 5 4 2 2 1 1 1

Every atom is made up of three kinds of smaller particles, called protons (which are positively charged), neutrons (which have no charge) and electrons (which are negatively charged).

There are more than109different types of atom -

smallest part of an element that can participate in a chemical reaction is called atom.

RenalMedulla. The medulla is the inner region of the parenchyma of thekidney. ... At one end of each nephron, in the cortex of thekidney, is acup-shapedstructure called the Bowman's capsule

The higher the atomic radius the higher the atomic numberA = 186 pmB = 192 pmC =143When we convert it into increasing atomic radius then first will be C then A and then the biggest B

CAB

A transition metal or element is generally defined as a metal which has partially filled d orbitals in the neutral atom or in any of its usual positive oxidation states.

The first transition series extends from scandium (Sc) to copper (Cu).

Electronic Configuration of The First Transition Series

Properties (Physical and Chemical) of Transition ElementsTransition metals show unique physical and chemical properties.

1. They are all Metals.

2. They are hard, malleable, ductile and are of very high melting and boiling points. Compared with the main group metals (such as metals of group one), transition metals have higher boiling and melting point .

The reason for this is the presence of very strong metallic bonding - due to large number of valence electrons involved in it.

3. They are good conductors of electricity. This is because their electrons are very free to move about within the available vacant d orbitals.

4. They exhibit paramagnetism. This is due to the presence of unpaired electrons.

Chemical Properties

1. Variable oxidation state

Apart from scandium which forms only +3 oxidation state, transition metals show various positive oxidation states by losing electrons from both their 4s and 3d orbitals (the energy difference between these orbitals is small).

Oxidation state of +2 is formed by the loss of the two electrons of the 4s (except in Cr and Cu, where the two electrons are lost from 4s and 3d orbitals, with each orbital losing an electron.

Compounds of the metals (from Ti to Cr) in the +2 state are ionic and are strong reducing agents (they are strongly oxidized). Example, Ti2+, V2+ and Cr2+.

An electrostatic precipitator is a type of filter that uses static electricity to remove soot and ash from exhaust fumes before they exit the smokestacks.

An Ideal fuel has following characteristics:

It is readily available,

It is less expensive,

It burns easily in air at a moderate rate,

It produces a large amount of heat,

It can transport easily

It has high calorific value, and

It does not leave behind any undesirable substances.

B is the correct answer.

d answe ok ok ok ok ok ok ok

D is wrong... ..ok..ok..

The incorrect option is B so correct answer is B

shut up ok correct answer is d

shut up correct is d

kindly upload the image along with tbe question.

No doubt hydrogen gas is cleaner fuel than CNG as CNG contains hydrocarbons. Which contain carbon and it is a form of pollutant present in CNG.But hydrogen is waste-free. The fusion of hydrogen does not produce any waste. Therefore hydrogen is cleaner than CNG.

option acoolants is correct

c) nuclear fuel

c because nuclear fuel

option c is the correct answer

In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.

Burning of candle is Physical change, since Solid wax is converted to liquid on heating and liquid to solid on cooling

Burning of candel is an physical change

Burns of candle is a physical change that is reversible change, because when the wax melt it again regain to wax.

burning of candle is a chemical change because new products water vapour carbon dioxide are released and it is irreversible while melting of candle is a physical change

Activity of enzymes: Mg plays a crucial role in the biochemical reactions occurring in our body. The main role of this ion in the body is to regulate the functions ofenzymeswhich in turn are responsible for various chemical reactions. Magnesium as an enzyme co-factor plays an important role in the breakage of glucose and fat molecules, in the production of enzymes, proteins and regulation of cholesterol.

Acts as fuel source: It plays an important role in the production of energy within the cells.Without the sufficient supply of this ion nutrients cannot be converted into usable energy or ATP (adenosine triphosphate) which is the fundamental unit of energy in human body. Production of ATP is significant to perform various actions such as cell reproduction, protein synthesis etc.

Protector of human DNA: DNA synthesis is not possible without the sufficient supply of this ion. It is responsible for the stability and proper functioning of DNA

To maintain an electrolyte balance: It is one of the most important mineral in order to maintain a healthy electrolytic balance in our body.Deficiency of this ion leads to the improper functioning of sodium-potassium pump.

rocket firecracker is the answer

There are nearly 114 elements are known and we need to study them all.

But, it is impossible to remember all the physical and chemical properties of each and every element so we need to classify them on the basis of some similar characteristics so that, if we study one element we would be able to understand the properties of others too.

The centrally—sponsored scheme ofDistrict Primary Education Programme(DPEP) was launched in 1994 as a major initiative to revitalize the primary education system and to achieve the objective of universalisation of primary education.