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ong>Answer:

TRANSITION elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an ELEMENT having a d subshell that is partially filled with ELECTRONS, or an element that has the ability to form STABLE cations with an incompletely filled d orbital.

ong>ANSWER:

Carbon nitrogen HYDROGEN sulphur.

ong>ANSWER:

Na(OH)2 + HCL -> NACL + H2O + H2

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ong>Explanation:

Explanation:

ANSWER:

Answer:

Answer:

Answer:

Width of rectangle is 25 CM.

Step-by-step explanation:

Given :-

A wire bend in form of square of side 30 cm.

Then wire is again bend in form of rectangle of length 35 cm.

To find :-

Width of the rectangle.

Solution :-

Here, CONCEPT is : If we are bending wire in form of square than again bending it in rectangle. Than, perimeter of square will equal to perimeter of rectangle because we are not increasing length of wire by one measure we are bending it in square and rectangular shape.

So,

Perimeter of square = 4 × side

⟶ Perimeter = 4 × 30

⟶ Perimeter = 120

Thus,

Perimeter of square is 120 cm.

According to concept, Perimeter of square and perimeter of rectangle are equal.

So, Perimeter of rectangle is 120 cm.

Let, Breadth or width or rectangle be X cm.

We KNOW,

Perimeter of rectangle = 2(Length + Breadth)

⟶ 120 = 2×(35 + x)

⟶ 120 = 70 + 2x

\⟶ 120 - 70 = 2x

⟶ 50 = 2x

⟶ 50/2 = x

⟶ x = 25

We take, Width of rectangle be x.

Therefore,

Width of rectangle is 25 cm.

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ong>ANSWER:

Equivalent weight of a substance (oxidant or reductant) is equal to the molecular weight divided by the number of electrons lost or GAINED by one molecule of the substance in REDOX REACTION. So, our answer is 31.6 per equivalent.

Explanation:

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Benzene can be prepared from aromatic ACIDS through decarboxylation reaction. In this PROCESS, the SODIUM salt of the benzoic acid (sodium benzoate) is heated with soda lime to produce benzene along with sodium CARBONATE.

3>

→NH3 has higher dipole moment than NF3 . » REASON: in case of NH3, nitrogen is more electronegative than hydrogen,so it tries to PULL the ELECTRONS from hydrogen atoms. where as in case of NF3, fluorine being more electronegative than nitrogen tries to pull the electrons from nitrogen OPPOSITE from that of nitrogen.

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❥︎Aɴsᴡᴇʀ

➪Tʜree TRIADS

Döbereiner could identify only three triads from the ELEMENTS known at that time (Table 5.2). Hence, this system of classification into triads was not found to be USEFUL. Johann Wolfgang Döbereiner STUDIED as a pharmacist at Münchberg in Germany, and then studied chemistry at Strasbourg.

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ong>Answer:

The cleaning action of soap is due to micelle formation and emulsion formation. Inside water a unique orientation FORMS CLUSTERS of molecules in which the hydrophobic tails are in the interior of the CLUSTER and the ionic ends on the SURFACE of cluster. This results in the formation of micelle.

ong>Explanation:

The reaction of an ACID with a base is called a neutralization reaction. The products of this reaction are a salt and water.

For example, the reaction of hydrochloric acid, HCl, with sodium hydroxide, NAOH, SOLUTIONS produces a solution of sodium chloride, NACL, and some additional water molecules.

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ong>ANSWER:

Permanent hardness of WATER can be REMOVED by Washing Soda

and cannot be removed by common salt.

Explanation:

ong>ANSWER:

BAKELITE is HARD and has HIGH MELTING temperature

ong>Answer:

OH - alcohol group

Explanation:

alcohol group

COMPOUND NAME : penten1-ol

ा स्वभाव उभयधर्मी होता है। यह अम्ल तथा क्षार दोनों की भाँति कार्य करता है। स्वयं से प्रबल अम्लों के साथ यह क्षार की भाँति व्यवहार करता हैं। जबकि स्वयं से प्रबल क्षारों के प्रति यह अम्ल की भाँति व्यवहार करता है।

ong>Answer:

PREPARATION from VICINAL dihalides

The FIRST step is to prepare the unsaturated halides.

The halides formed have a halogen ATTACHED to a double-bonded carbon. ...

These halides are MADE to react with the strong base which results in the formation of alkynes.

Explanation:

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The Impact FACTOR MEASURES the average number of CITATIONS received in a particular year by papers published in the journal during the two

ong>Answer:

CATALYSIS is the process of INCREASING the rate of a chemical reaction by adding a SUBSTANCE known as a catalyst (/ˈkætəlɪst/). Catalysts are not consumed in the catalyzed reaction but can act repeatedly. Often only very small amounts of catalyst are required.

Desorption is a phenomenon whereby a substance is released from or through a surface. The process is the opposite of SORPTION. This occurs in a system being in the state of sorption equilibrium between bulk phase and an adsorbing surface.

Sorption is a physical and chemical process by which one substance becomes attached to another.

CO it is the FORMULA of CARBON monoxide

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>PTFE is polymerized from the chemical compound tetrafluoroethylene, or TFE. A non-stick pan is composed of VARYING non-stick LAYERS. TFE is synthesized from FLUORSPAR, hydrofluoric ACID, and chloroform. These ingredients are combined under HIGH heat, an action known as pyrolosis.

The temperature REMAINS constant during BOILING of WATER even though heat is supplied constantly because all the heat energy provided is used up in changing the state of water from liquid to gaseous water vapour

Explanation:

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ong>Answer:

The drawback of Rutherford model is: It can't explain the stability of an atom. As PER the model, the orbital revolution of electrons AROUND the NUCLEUS is not stable as the revolving electrons in orbits will UNDERGO acceleration and emit energy.

ong>ANSWER:

BARIUM sulfate is prepared by reacting barium chloride with sodium sulfate. The barium sulfate is formed as a precipitate.

Describe an EXPERIMENT to prepare a pure, DRY sample of barium sulfate, starting with barium chloride CRYSTALS and sodium sulfate crystals.

ong>Answer:

Solution:

The reaction between an acid and a base is known as a neutralisation reaction. Often when an acid and base REACT a salt and water will be formed. We will look at a few examples of acid-base reactions.

In chemistry the word salt does not mean the white substance that you sprinkle on your food (this white substance is a salt, but not the only salt). A salt (to chemists) is a product of an acid-base reaction and is made up of the cation from the base and the anion from the acid.

Hydrochloric acid reacts with sodium hydroxide to form sodium CHLORIDE (a salt) and water. Sodium chloride is made up of Na+ cations from the base (NaOH) and Cl− anions from the acid (HCl).

HCl (AQ)+NaOH (aq)→H2O (l)+NaCl (aq)

Hydrogen bromide reacts with potassium hydroxide to form potassium bromide (a salt) and water. Potassium bromide is made up of K+ cations from the base (KOH) and Br− anions from the acid (HBr).

HBr (aq)+KOH (aq)→H2O (l)+KBr (aq)

Hydrochloric acid reacts with ammonia to form ammonium chloride (a salt). Ammonium chloride is made up of NH+4 cations from the base (NH3) and Cl− anions from the acid (HCl).

HCl (aq)+NH3(aq)→NH4Cl (aq)

You should notice that in the first two examples, the base contained OH− ions, and therefore the products were a salt and water. NaCl (table salt) and KBr are both salts. In the third example, NH3 also acts as a base, despite not having OH− ions. A salt is still formed as the only product, but no water is produced.

It is important to realise how useful these neutralisation reactions are. Below are some examples:

Domestic uses

Calcium oxide (CaO) is a base (all METAL oxides are bases) that is put on soil that is too acidic. Powdered limestone (CaCO3) can also be used but its action is much slower and less effective. These substances can also be used on a larger scale in farming and in rivers.

Limestone (white stone or calcium carbonate) is used in pit latrines (or long drops). The limestone is a base that helps to neutralise the acidic waste.

Biological uses

Acids in the stomach (e.g. hydrochloric acid) play an important role in helping to digest food. However, when a person has a stomach ulcer, or when there is too much acid in the stomach, these acids can cause a lot of pain. Antacids are taken to neutralise the acids so that they don't burn as much. Antacids are bases which neutralise the acid. Examples of antacids are aluminium hydroxide, magnesium hydroxide (“milk of magnesia”) and sodium bicarbonate (“bicarbonate of soda”). Antacids can also be used to relieve heartburn.

Industrial uses

Basic calcium hydroxide (limewater) can be used to absorb harmful acidic SO2 gas that is released from power stations and from the burning of fossil fuels.

Bee stings are acidic and have a pH between 5 and 5,5. They can be soothed by using substances such as bicarbonate of soda and milk of magnesia. Both bases help to neutralise the acidic bee sting and relieve some of the itchiness!

Acid-base reactions

Aim

To investigate acid-base reactions.

Apparatus and materials

Volumetric FLASK

conical flasks

sodium hydroxide solution

hydrochloric acid solution

pipette

indicator

Method68a976f5804a61d7bdc10494dea3e172.png

Use the pipette to add 20 ml of the sodium hydroxide solution to a volumetric flask. Fill up to the mark with water and shake well.

लिखित उत्तर

72.572.5

65

62.562.5

None of these

Answer :

ong>Explanation:

iron oxide

Rust is the COMMON name for a very common COMPOUND, iron oxide. Iron oxide, the chemical FE2O3, is common because iron combines very readily with OXYGEN -- so readily, in fact, that pure iron is only rarely found in nature.

REFER The Attachment

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ong>ANSWER:STRONG>

Ionic compounds have strong electrostatic forces of attraction between the ions. THEREFORE, it requires a LOT of energy to OVERCOME these forces.

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No woh ladki hai unha laka ki ma unka liya apna bio lakya hai.

USKA NAM VARSHINI hai.

Aur mera name suraj hai.

How r U?

ong>Answer:

Monetized benefits included reductions in medical costs and mortality associated with diarrheal diseases, productive time saved from fewer diarrhoea cases and ACCESSING outside DEFECATION options, and increase in the PROPERTY value of having a toilet

are STRONG BONDING COMPOUNDS

SODIUM CHLORIDE is a soluble salt. It is best prepared by a TITRATION method using a neutralisation reaction between an acid and an alkali.

ong>Answer:

Combustion is the complete oxidation of organic compound into carbon dioxide and water molecules in PRESENCE of OXYGEN gas whereas oxidation is the addition of oxygen in a compound or addition with an element.  Combustion reactions involve HEAT and light whereas oxidation reaction does not involve heat.

ong>ANSWER:

A aqueous LEAD nitate

Explanation:

PbNo3 +H2So4=PbSo4+HNo3

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Mol. mass of ETHYL ALCOHOL =C

2

H

5

OH=46

No. of MOLES of ethyl alcohol =

46

60

=1.304

Mol. mass of methyl alcohol =CH

3

OH=32

No. of moles of methyl alcohol =

32

40

=1.25

′

X

A

′

, mole fraction of ethyl alcohol =

1.304+1.25

1.304

=0.5107

′

X

B

′

, mole fraction of methyl alcohol =

1.304+1.25

1.25

=0.4893

Partial pressure ethyl alcohol =X

A

p

˙

A

0

=0.5107×44.5=22.73mmHg

Partial pressure methyl alcohol =X

B

p

˙

B

0

=0.4893×88.7=73.40mmHg

Total VAPOUR pressure of solution =22.73+43.40=66.13mmHg

Mole fraction of methyl alcohol in the vapour

=

Total vapour pressure

Partial pressure of CH

3

OH

=

66.13

43.40

=0.6563

ong>Answer:

A disproportionation reaction is when a multiatomic SPECIES whose pertinent element has a specific oxidation state gets oxidized and REDUCED in two separate half-reactions, yielding two other products CONTAINING the same pertinent element. A convenient example is Mn2O3 BECOMING Mn2+ and MNO2.

IUPAC NAME of ACETYLENE:

Ethyne.......

Explanation:

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Explanation:

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Anodising is an electrolytic process for PRODUCING thick OXIDE coatings, usually on aluminium and its alloys. The oxide layer is typically 5 to 30µm in thickness and is USED to give improved surface resistance to wear and corrosion, or as a DECORATIVE layer.

ong>ANSWER:

d.zinc chloride

EXPLANATION:

because we are in the world of the same way we have to WRITE to you about the world

অধিশোষণ হল একটি পদার্থের তার সঙ্গে সংস্পর্শে থাকা অপর একটি পদার্থের অভ্যন্তরে প্রবেশ না করে উক্ত পদার্থের পৃষ্ঠতলে সঞ্চিত বা কেন্দ্রীভূত হওয়ার ঘটনা।

সাধারণত কঠিন পদার্থের পৃষ্ঠতলে গ্যাস বা কোনো দ্রবণে দ্রবীভূত দ্রাবের অধিশোষণ ঘটে। অন্যদিকে তরল পদার্থের পৃষ্ঠতলে কোনো গ্যাসের অধিশোষণ হয়ে থাকে।[১]

কঠিনের পৃষ্ঠতলে গ্যাসের অধিশোষণ

অধিশোষক:যে পদার্থের পৃষ্ঠতলে অপর পদার্থের অধিশোষণ ঘটে তাকে অধিশোষক পদার্থ বলা হয়।যেমন-সক্রিয় চারকোল,সিলিকা জেল,বেন্টোনাইট ইত্যাদি।

একটি অধিশোষক:সক্রিয় চারকোল

অধিশোষিত পদার্থ:অধিশোষক পদার্থের পৃষ্ঠতলে যে পদার্থের অধিশোষণ ঘটে তাকে অধিশোষিত পদার্থ বলা হয়।যেমন-অ্যামোনিয়া,হাইড্রোজেন,কার্বন ডাইঅক্সাইড,অক্সিজেন ইত্যাদি গ্যাসগুলি সক্রিয় চারকোল দ্বারা অধিশোষিত হয়।

ong>ANSWER:

yes BRO

Explanation:

yes bro you are RIGHT

ong>Answer:

Peace of MIND is a mental STATE of calmness or tranquility, a freedom from WORRY and anxiety.

ong>Explanation:

Co(NH3 )4(H2O)Cl]SO4

In the above compound,

Oxidation state of AMMONIA, (NH

3 )=0

Oxidation state of water, (H2O)=0

Oidation state of chlorine, (Cl)=−1

Oxidation state of sulphate ion, (SO4 )=−2

Let the oxidation state of cobalt, (Co) be x.

As we know that SUM of oxidation STATES of all atoms is equal to the overall CHARGE on the compound.

∴x+(4×0)+(1×0)+(−1)+(−2)=0

⇒x+0+0−1−2=0

⇒x−3=0

⇒x=+3

Hence, the oxidation state of cobalt, (Co) in the compound [Co(NH3)4(H2O)Cl]SO4is +3.

INTERESTED ONES please

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zxz

In chemistry, disproportionation, sometimes CALLED dismutation, is a redox REACTION in which one compound of intermediate oxidation STATE converts to two compounds, one of higher and one of lower oxidation states.

Explanation:

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ong>ANSWER:

Ionic compounds are ION compounds. These ions are atoms that gain or LOSE electrons, resulting in a net positive or NEGATIVE charge. Metals tend to lose electrons, so they have a net positive charge and become cations. Non-metals tend to gain electrons, creating a net negative charge of anions.

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