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ong>Answer:

The Modern Periodic Law STATES that the CHEMICAL and physical PROPERTIES of elements are periodic functions of their atomic numbers i.e. if elements are arranged in the order of their increasing atomic number, the elements with similar properties are repeated after certain REGULAR intervals.

ong>Answer:

दी दो एचसी क्ल नज cm HX go hm

if CL उसके हम ऑफ दी हम नल

उद क्ल उद हो गई जम वल उद

उद वल तो तो

Explanation:

दी उद क्ल हम हो हो तो

जग दो गल हो गल एचसी बी गम वल घ श जेडी क्ल नल

मैक क्ल उद क्ल घ जेडी च हम

मैक क्ल गल हो

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ong>Answer:

WATER is a chemical COMPOUND and polar molecule, which is liquid at standard temperature and pressure. It has the chemical formula H2O, MEANING that one molecule of water is composed of two hydrogen atoms and one oxygen ATOM. Water is found almost everywhere on earth and is required by all known LIFE.

ong>Answer:

1.c

2.d

3.b

4.a

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ong>ANSWER:

I am not sure about

EXPLANATION:

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weight of SALT = 90 GRAM,

solubility = 50

sing formula

solubility of solute =

weightofsolventinsaturatedsolution

weightofsoluteinsaturatedsolution

×100

or 50=

weightofsolventinsaturatedsolutio

90gm

×100

so weight of solvent in saturated solution =

50

90gm

×100=180gm

Hence 180 gm of water is required to prepare a saturated solution.

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no those TWO solutions will not have the same CONCENTRATION

ong>Answer:

When potassium hydroxide (KOH) is heated in an inert ATMOSPHERE, decomposition TAKES place and potassium oxide and water is formed during the following decomposition step [14]

Explanation:

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ong>ANSWER:

firstly i didn't understand your language PROPERLY,, but what i INFER is that you are asking that if COBALT can be written as Co and it is correct

ong>Answer:

A chemical formula is an EXPRESSION that shows the elements in a COMPOUND and the RELATIVE proportions of those elements. Water is composed of hydrogen and oxygen in a 2:1 ratio. The chemical formula for water is H2O.

ong>ANSWER:

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Explanation:

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ong>Answer:

Established by French chemist François-Marie Raoult in 1887, it STATES that the partial pressure of each component of an IDEAL mixture of liquids is equal to the vapour pressure of the pure component MULTIPLIED by its mole FRACTION in the mixture.

Explanation:

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ong>Answer:

There are four main FACTORS that can affect the reaction rate of a chemical reaction:

Reactant concentration. Increasing the concentration of one or more REACTANTS will often increase the rate of reaction. ...

PHYSICAL state of the reactants and surface AREA. ...

Temperature. ...

Presence of a catalyst.

ong>ANSWER:

I don' KNOW

EXPLANATION:

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ong>ANSWER:

Halogens have VALENCY 1 and are non-metals

Explanation:

ong>ANSWER:

Quantum mechanics is a fundamental theory in physics that PROVIDES a description of the physical properties of nature at the SCALE of atoms and SUBATOMIC particles. It is the foundation of all quantum physics including quantum chemistry, quantum field theory, quantum technology, and quantum information science

EXPLANATION:

PCL5

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ong>Answer:

The reaction of ONOO- with CO2 at alkaline pH was recently reported to form a transient absorption with a maximum at 640 nm and a half-life of ca. 4 ms at 10 °C [Meli et al. (1999) Helv. Chim. Acta82, 722−725]. This transient absorption was hardly affected by the presence of •NO, and THEREFORE was attributed to the adduct ONOOC(O)O-. This conclusion CONTRADICTS all current experimental results as it SUGGESTS that the decomposition of this adduct VIA homolysis of the O−O bond into CO3•- and •NO2 is a MINOR pathway. In the present work the observations

ong>Explanation:

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The QUANTUM numbers N = 4 and l = 2 correspond to 4D subshell. It can accommodate 10 electrons.

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ong>ANSWER:

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Explanation:

Mass percentage = mass of SOLUTE / mass of solvent x 100.

Mass % = 25.

Mass of solvent = 250 g.

Mass of solute = 25 x 250/100.

= 62.5 g.

Mass of water = Mass of solution - Mass of solute.

If the TEMPERATURE is reduced to half, pressure WOULD ALSO be reduced to half.

Correct question:-

Calculate the number of moles of nitrogen gas that contains 0.03011×10²³ MOLECULES.

Given:-

→Number of molecules = 0.03011×10²³

To FIND:-

→Number of moles

Solution:-

•AVOGADRO number = 6.022×10²³

No of moles:-

= No of particles/Avogadro number

= 0.3011×10²³/6.022×10²³

= 0.3011/6.022

= 0.05 mole

Thus is the required number of moles of nitrogen gas is 0.05.

Some Extra Information:-

Number of moles:-

= Given mass/Molar mass (1)

= No of particles/Avogadro number (2)

Number of atoms:-

= No of moles × Avogadro number

Number of molecules-

= No of moles × Avogadro number

ong>EXPLANATION:

Acids and METAL carbonates

When acids react with carbonates, such as CALCIUM carbonate (found in CHALK, limestone and marble), a salt, water and carbon dioxide are made.

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The SI UNIT Of ELECTRIC CURRENT is AMPERE.

ong>ANSWER:

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d. NONE of these

Explanation:

none of these

Over time melamine will SAG and crack, it is very HEAVY too. PVC will remain the same, it is sturdy but LIGHT, and is fire retardant

ong>Answer:

The global Covid - 19 pandemic unexpectedly entered our LIVES and put everything to a halt. It affected the lives of people around the world bringing a flood of tension and worries followed by NEGATIVE thoughts and piles of boredom. But I took it as a challenge to handle this situation with determination and positivity thereby taking advantage of the lockdown. My parents motivated me to complete this challenge. The lockdown has affected my LIFE quite disturbingly. My first priority, Taekwondo Federation of India National - Level Championship, scheduled in March got postponed. I desperately wanted to win a national GOLD medal in taekwondo for the SECOND time. Another high valued South Asian Cup Martial Arts Championship in Nepal that was due in Feb - March 2020 also got delayed. I was really looking forward to more tournaments in 2020. But my coaches have not let my fitness get off the track as I am enjoying virtual classes

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ong>EXPLANATION:

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ong>ANSWER:

AQUEOUS is in water

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ong>Answer:

To find the VALENCY of an element, it is absolute that we must know the ATOMIC number of that element. the answer is 4. For elements with VALENCE electrons >4, SUBTRACT it from number 8. For example Fluorine ⚛️ the Valency is 2,7 and the valence shell numner is 7.

Explanation:

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ZINC CHLORIDE is answer

ong>Answer:

Carbon atom has been no TENDENCY to lose its four VALENCE electrons or gain four more electrons from other ATOMS. THEREFORE, carbon atom completes its octet only by sharing its valence electrons with other atoms. As a result, therefore carbon ALWAYS forms only covalent bonds with other atoms.

Explanation:

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1 thettahedral

Explanation:

2 pectataehedral

ong>Answer:

Answer: The solubility of solute in WATER at 25 ° C is 10 GRAMS per 100 g water.

Explanation:

Mass of the solute = 4 grams

Mass of the solvent = 40 grams

Solubility=\frac{\text{mass of solute}}{\text{mass of solvent}}\times 100Solubility=

mass of solvent

mass of solute

×100

=\frac{4}{40}\times 100=10=

40

4

×100=10 grams per 100 g water

So, the solubility of solute in water at 25 ° C is 10 grams per 100 g water.

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ong>Explanation:

Each CS+ ion is surrounded by EIGHT Cl– ions and each Cl– ion is surrounded by eight Cs+ ions. THUS, the structure has a 8 : 8 coordination. A few examples of compounds having CsCl structures are CsBr, CsI, NH4Cl, TlCl, TlBr, TLI.

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Explanation:

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Explanation:

Definition: ELECTRIC current is defined as the rate of flow of negative charges of the CONDUCTOR. In other words, the continuous flow of electrons in an electric circuit is called an electric current. The CONDUCTING material CONSISTS a large number of free electrons which move from ONE atom to the other at random.

ong>Explanation:

Diuretics are banned in all sports because they can cause RAPID weight loss and can ACT as MASKING agents (to hide the EFFECTS of other prohibited substances) both in and out of competition. ... For diuretics, the PRIMARY permitted therapeutic use is for hypertension (WADA, 2008b).

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ong>Answer:

0 K ,or -273° C

Explanation:

This is the temperature of ABSOLUTE ZERO.  At this temperature, Kinetic ENERGY is zero. Below this temperature, nothing can exist.

ong>EXPLANATION:

The knowledge about interior of the EARTH is obtained through direct sources and indirect sources. Direct sources include rock materials from mining areas and molten MAGMA from volcanic eruptions. Besides, scientists are working on “Deep Ocean drilling PROJECT” and “Integrated Ocean Drilling Project”.