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ong>Answer:

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EXPLANATION:

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Answer:

Neopentane

Neopentyl alcohol is a compound with formula C5H12O or (H3C)3CCH2OH. It is an alcohol derived from neopentane, or C(CH3)4.

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When certain solutes are mixed with WATER/ice, they lower the melting/freezing point below 0°C. This makes the ice MELT at a lower (COLDER) temperature than normal and means that water needs to be colder than 0°C to turn from a liquid back into a solid.

ong>ANSWER:

The equation for CALCULATING MOLARITY is the ratio of the moles of solute whose molarity is to be calculated and the volume of solvent used to DISSOLVE the given solute. M = \frac{n}{V} Here, M is the molality of the solution that is to be calculated. n is the number of moles of the solute.

ong>Answer:

soapy water or SOAP SOLUTION as PH of above 12

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ong>ANSWER:

A chemical formula is the representation of substance by symbols and it DENOTES the number of atoms of each element present in the compound. To WRITE a formula one must know the symbols and valencies of the elements.The valency of Hg=2 and of Cl=1 so the formula is HgCl

2

.

ong>ANSWER:

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Explanation:

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बिल्ली बच गई

ढोलू – मोलू दो भाई थे। दोनों खूब खेलते , पढ़ाई करते और कभी-कभी खूब लड़ाई भी करते थे। एक दिन दोनों अपने घर के पीछे खेल रहे थे। वहां एक कमरे में बिल्ली के दो छोटे-छोटे बच्चे थे। बिल्ली की मां कहीं गई हुई थी , दोनों बच्चे अकेले थे। उन्हें भूख लगी हुई थी इसलिए खूब रो रहे थे। ढोलू – मोलू ने दोनों बिल्ली के बच्चों की आवाज सुनी और अपने दादाजी को बुला कर लाए।

दादा जी ने देखा दोनों बिल्ली के बच्चे भूखे थे। दादा जी ने उन दोनों बिल्ली के बच्चों को खाना खिलाया और एक एक कटोरी दूध पिलाई। अब बिल्ली की भूख शांत हो गई। वह दोनों आपस में खेलने लगे। इसे देखकर ढोलू – मोलू बोले बिल्ली बच गई दादाजी ने ढोलू – मोलू को शाबाशी दी।

नैतिक शिक्षा – दूसरों की भलाई करने से ख़ुशी मिलती है।

ong>Answer:

Lower the VALUE of (n +l), lower is the ENERGY . For orbitals having same value of (n +l), the orbital with lower value of n will have lower energy. ... HENCE, 5s has the lowest energy. (b) 5p=5+1=6,5d=5+2=7,5F=5+3=8,6s=6+0=6,6p=6+1=7 Hence, 5f has highest energy. my dear please love

Therefore, the bcc lattice can be considered as a unit cubic cell with two lattice points per cell.❤

ong>Explanation:

If the ELECTRON jumps from N

2

=5 to n

1

=1 then following are the transitions possible.

5−4

5−3

5−2

5−1

4−3

4−2

4−1

3−2

3−1

2−1

HENCE there are 10 transitions and hence 10 spectral lines possible.

>

Sodium hydrogen carbonate + Acetic acid → Sodium acetate + Carbon dioxide + Water

Type of Chemical Reaction: For this reaction we have a chemical reaction.

Balancing Strategies: In this reaction we have NaHCO3 (baking soda) reacting with an aqueous SOLUTION of HC2H3O2 (vinegar) to form NaC2H3O2 + CO2 + H2O.

The BUBBLES you see when you mix backing soda with vinegar are the CO2 found on the product SIDE of the equation.

ong>Answer:

1). Electrochemical series also sometimes referred to as activity series is a list that describes the ARRANGEMENT of ELEMENTS in order of their increasing electrode potential VALUES. The series has been established by measuring the potential of various electrodes versus standard hydrogen electrode (SHE).

2). Endothermic and exothermic reactions are chemical reactions that ABSORB and release heat, respectively. A good example of an endothermic reaction is photosynthesis. Combustion is an example of an exothermic reaction. The categorization of a reaction as endo- or exothermic depends on the net heat transfer.

ong>Answer:

In quantum MECHANICS, the PRINCIPAL quantum number (symbolized N) is one of FOUR quantum numbers ASSIGNED to each electron in an atom to describe that electron's state. Its values are natural numbers (from 1) making it a discrete variable.

Explanation:

Pyrogallol/Formula

C6H6O3

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Mixtures can be classified on the basis of particle size into three different TYPES: solutions, suspensions, and colloids. The components of a mixture retain their own PHYSICAL PROPERTIES.

ong>Answer:

ETHYNE gas(Acetylene) is prepared in the laboratory by the ACTION of water on calcium carbide. Procedure: Lumps of calcium carbide are PLACED on the LAYER of sand in conical flask fitted with a dropping funnel and delivery tube. Water is dropped from the dropping funnel whereby ethyne(acetylene) is formed.

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ong>Answer:

Take a candle and fix it on a table. The candle is lighted. The candle will CONTINUE to burn due to continuously available fresh air providing the required oxygen for combustion.

Now cover the burning candle by putting an inverted GAS jar over it. After a short time, the candle stops burning and gets EXTINGUISHED. When the burning candle is COVERED with gas jar, then the candle takes AWAY the oxygen necessary for burning from the air enclosed in the gas jar. After some time, when all the oxygen of air inside the gas jar is used up, then the burning candle gets extinguished. This proves that air is necessary for combustion of substances.

Diagram:

ong>Answer:

FLOC which COLLECTS on the bottom of the basin is called sludge, and is piped to drying lagoons

Explanation:

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what did you WANT to SAY

H stands for Hydreogen.

O stands for OXYGEN.

ong>ANSWER:

OK

Explanation:

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ong>Answer:

Tetrahedral structure

Explanation:

Tetrahedral structure is also FOUND in the phosphate ion, PO43-, SULFATE ion, SO42-, and perchlorate ion, ClO4-.

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ong>Answer:

In FACE centred cubic lattice ( FCC ) , Lattice points are 8 corners and 6 face centres , HENCE 14 lattice are present

Explanation:

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ong>Explanation:

step 1

Divide the given percentages of atoms with their molecular masses

H---4.07/1 =4.07

C---24.27/12 =2.02

Cl--71.65/35.5=2.01

step 2

divide all VALUES with the lowest VALUE OBTAINED.

H---4.07/2.01=2

C---2.02/2.01=1

Cl---2.01/2.01=1

therefore the empirical formula is

CH

2

Cl

WEIGHT OF EMPIRICAL FORMULA=12+2+35.5=49.5

Given molecular weight =98.96 which is double of empirical weight .therefore molecular formula is C

2

H

4

Cl

2

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Explanation:

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ong>Answer:

In chemistry, ORBITAL hybridisation (or hybridization) is the concept of mixing atomic orbitals into NEW hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the PAIRING of electrons to form chemical bonds in valence bond theory.

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Explanation:

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Explanation:

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ong>Answer:

It takes time for pieces of Shahabad tile to DISAPPEAR in HCl, but its powder disappears RAPIDLY because in pieces of the tile, the surface atoms can only REACT with HCl but in powdered form all the atoms can react with HCl. This makes the difference in their reactivity.

stion:-

Balance the following equation.

ANSWER:-

Given equation,

FIRST of all, we will check WHETHER it is ALREADY balanced or not.

As we can see that the number of atoms of each element on both sides are EQUAL, so it is already balanced.

Hence, the equation is a balanced equation.

correct OPTION is (C)

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ong>Explanation:

Hydrogen as alkali metal?

The only thing hydrogen has in common with alkali metals is in having one electron in its outermost shell and having a valency (combining power) of one. Unlike the group one elements hydrogen is clearly not a metal (it is a gas at room temperature) and is a poor conductor of heat and electricity. It does not readily form H+ cations and forms covalent bonds in most compounds, whereas group 1 metals readily form cations and form only ionic bonds. Also, alkali metals form basic oxides while hydrogen oxide (water) is amphoteric (both acidic and basic).

Hydrogen as a halogen?

Hydrogen, like the halogens, has one electron short of a complete outer shell and can form H- ions like Cl- and therefore forms ionic compounds with reactive metals – NaH similar in structure to NaCl. Hydrogen also exists as a diatomic gas like fluorine and chlorine. However, here the similarity ends – hydrogen is a reducing agent while the halogens are oxidising agents, hydrogen reacts vigorously with oxygen but not with most metals while the REVERSE is true of the halogens. Furthermore, hydrogen oxide (water) is amphoteric, while halogen oxides are acidic only.

So hydrogen is neither an alkali metal nor halogen.

Position Of Hydrogen

1)Hydrogen is the first element in the periodic table.

2)It is the lightest element known.

3)It ATOMIC form exists only at high temperature.

4)It exist as a diatomic molecule i.e. H2 .That is why it is also called dihydrogen.

5) It was discovered by Henry CAVENDISH in 1766.

6) Its electronic configuration is 1s1

Unique position of Hydrogen in periodic table

A proper position could not be assigned to it because of the following reason:

1) In some PROPERTIES it resembles alkali such, it can be placed in group 1 of the periodic table along with alkali metals.

2) In some other properties, hydrogen resembles such, it can be placed in group 17 along with halogens.

3) In some hydrogen differs from both alkali metals and halogens.

Resemblance with alkali metals

Hydrogen resembles alkali metals i.e. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table.

1) Electronic configuration : Like alkali metals, hydrogen also contains 1 electron in its outermost shell.

Hydrogen 1s1

Lithium 1s2 2s1

Sodium 1s2 2s2 2p6 3s1

2) Electropositive character: Like alkali metals ,hydrogen also loses its only electron to form hydrogen ion i.e. H+

H ——-> H+ + e‾

Na ———-> Na+ + e‾

Hydrogen like alkali metals exhibit electropositive character.

What is the..AKA don't KNOW

sulpher

Explanation:

OK it is the CORRECT answer

ong>Cubic Meter PER MOLE (m3/mol) is the unit of molar REFRACTION.

the FIRST THING that HAPPENED was that the terms of this is

ong>ANSWER:

DENSITY & size of the particles.

(a) There are 5 valence electrons in a neutral phosphorus atom. To complete its octet, it gains three electrons from a DONOR atom, so its valency is -3.

(b) Magnesium has 2 valence electrons. So, it forms a positive ion by donating the 2 electrons to complete its octet. So, it is a metal.

(c) Noble gases are elements which have duplet or octet configuration. As Neon has EC of 1s2 2s2 2p6 and has an octet configuration, it is a noble gas and hence is almost non-reactive.

(d) Gases are HIGHLY expansible because they have weak inter-molecular FORCES between their molecules and high inter-molecular distances.

Explanation:

ong>Answer:

1) NA2O is there for in IONIC or electrovalent compound formation of MGO: it has two electrons in its outer shell. the positively changed magnesium ions MG 2 + and oxide ions O2-are held TOGETHER by a strong force of electrostatic attraction to form magnesium oxide compound MG 2 + O2 - or MGO.

2) The ions PRESENTING and Na2O are SODIUM ions.

Your QUESTION is WRONG

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ong>Answer:

Iron(II) sulfate (BRITISH English: iron(II) sulphate) or ferrous sulfate denotes a range of salts with the formula FeSO4·xH2O. These compounds exist most COMMONLY as the heptahydrate (x = 7) but are known for several values of x. The hydrated FORM is used medically to treat iron deficiency, and also for industrial applications. Known since ancient times as copperas and as green vitriol (vitriol is an archaic name for sulfate), the blue-green heptahydrate (hydrate with 7 molecules of water) is the most common form of this MATERIAL. All the iron(II) sulfates dissolve in water to give the same aquo complex [FE(H2O)6]2+, which has octahedral molecular geometry and is paramagnetic. The name copperas dates from times when the copper(II) sulfate was known as blue copperas, and perhaps in analogy, iron(II) and zinc sulfate were known respectively as green and white copperas.[15]

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ong>Answer:

It BELONGS to II GROUP and 3 period.

Explanation:

The periodic table of elements arranges all of the known chemical elements in an informative ARRAY. Elements are arranged from left to right and TOP to BOTTOM in order of increasing atomic number. Order generally coincides with increasing atomic MASS. The rows are called periods.