Explore topic-wise InterviewSolutions in Current Affairs.

EXPLANATION:

ANSWER: (a) Silver article turns black when kept in the air because silver article REACTS with sulphur compounds such as hydrogen sulphide (H2S) PRESENT in air. The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver.

ANSWER:

CAC2 + N2 → CaCN2 + C

and

4H3PO3 → PH3 + 3H3PO4

1) matter exist in three different STATS - SOLID , liquid and gas
2) particles of matter have space in between them

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Formula for formic acid

HCOOH or CH2O2

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Tripeptide.

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Answer:

1.H2SO4, एचसीएल, HNO3

2.फॉर्मिक एसिड

3.सिरका अम्ल

7. आमतौर पर तटस्थ लेकिन थोड़ा अम्लीय माना जाता है

8.जब सोडियम बाइकार्बोनेट अधिक हाइड्रोक्लोरिक एसिड के साथ प्रतिक्रिया करता है तो NACL + H2O + CO2

ANSWER:

the OXIDATION of OIL and fatbis CALLED RANCIDITY

Molar concentration MEANS molarity.

Molarity=number of MOLES of solute/volume

of solution

Moles=mass/molar mass

Molar mass of sugar=342 g/mol

Just use the above INFORMATION to CALCULATE molar concentration.

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Answer:

The strengths of acids and bases in AQUEOUS SOLUTIONS can be determined by their acid or base ionization constants. STRONGER acids form weaker conjugate bases, and weaker acids form stronger conjugate bases.In solutions of the same concentration, stronger acids ionize to a greater extent, and so YIELD higher concentrations of hydronium ions than do weaker acids.

Explanation:

EXPLANATION:

this is very LONG conversation PLEASE CHECK the google.

ANSWER:

no

Explanation:

Answer:

HEY mate here are ur answers..

1. When water is boiled then it changes to steam (at 100°)

2. The paper changes to ash

3. We observe some water droplets on the outer surface of tumbler

4. ALUMINUM chloride decomposes

5. We will observe rust on iron nail

6. Sugar SUBLIMES and forms gas

7. We observe a pop sound as of burning hydrogen gas

8. When quick lime (Cao) is dissolved in water it changes to calcium hydroxide(Ca(OH) 2)

9. The lactobacillus bacteria stars dividing itself and change to curd.

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HELLO MATE HERE IS YOUR ANSWER

CH3COOH

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Answer:

given :

ENERGY of incident photon (hf) = y (J)

and THRESHOLD energy( ϕ ) = X (J)

As we KNOW that

KE = hf – ϕ

= y - x. (J)

Explanation:

it is CALLED pyrophosphoric ACID which on HEATING gives meta PHOSPHORIC acid ( HPO3 )

EXPLANATION:

We should follow some STEPS..

1 ) USE LPG at place of coal.

2)Use CNG vehicle REPLACING petrol or diseal.

ANSWER:

Explanation:

Atomic Structure The nucleus, in the center of atom, consist of protons and neutrons. Orbiting AROUND the nucleus are the electrons.Each UNIQUE element has an Atomic Number EQUAL to the number of protons it contains

ANSWER:

PHOSPHOROUS acid, is the compound described by the formula H3PO3. This acid is diprotic (readily ionizes two protons), not triprotic as MIGHT be suggested by this formula. Phosphorous acid is an intermediate in the preparation of other phosphorus compounds. ORGANIC derivatives of phosphorous acid, compounds with the formula RPO3H2, are called phosphonic acids.

Answer:

SUBSTANCE A is more ACIDIC than substance B, and contains more H+ IONS.

°.° The substance which has a low PH is considered to have more hydrogen ions.

Answer:

If the substance X is BROWN in colour it Should be Copper.

Under the presence of oxygen, COPPER forms copper oxide.The reaction is as follows--

2Cu+O2--->2CuO

Therefore the substance Y is called as Copper oxide.

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ANSWER:the PH of RAINWATER is 5.6

yes this rainwater will conduct electricity.

Explanation:the rainwater has NUMBER of ions and we KNOW that ions are needed to conduct electricity.the rainwater has some salts ,acids and gases dissolve in it with EASILY dissociate into ions.henceforth conduct electricity.

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Answer:

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Explanation:

1 Acetic acid FORMULA CH3COOH

2 Hydrochloric acid formula HCl

3 Sulfuric acid formula H2SO4

4 Acetate formula CH3COO-

5 Ammonia formula NH3

6 Nitric acid formula HNO3

7 Phosphoric acid formula H3PO4

8 Sodium phosphate formula Na3PO4

 9 Calcium carbonate formula CaCO3

10 Ammonium sulfate formula (NH4)2SO4

11 CARBONIC acid formula H2CO3

12 Sodium bicarbonate formula NaHCO3

13 Sodium hydroxide formula NaOH

14 Calcium hydroxide formula Ca(OH)2

15 Ethanol formula C2H5OH

16 Hydrobromic acid formula HBr

17 Hydrosulfuric acid formula H2SO4

18 Nitrous acid formula HNO2

 19 Potassium phosphate formula KH2PO4

20 Silver nitrate formula AgNO3

21 Sodium carbonate formula Na2CO3

22 Sodium chloride formula NaCl

 23 Aaluminum hydroxide formula Al(OH)3

24 Magnesium hydroxide formula Mg(OH)3

25 Methane formula CH4

26 Nitrogen monoxide formula NO

27 Potassium hydroxide formula KOH

28 Sodium nitrate formula NaNO3

29 Sulfurous acid formula H2SO3

30 Phosphate formula PO4

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ANSWER:

DISCOVERED by :Selman WAKSMAN.....

ANSWER:

more than FIFTY amino ACIDS make protiens

Answer:

The difference is, HEATING of sugar is a chemical CHANGE whereas heating of AMMONIUM chloride is a PHYSICAL as well as chemical change

Explanation:

The percentage concentration of any solution is most commonly expressed as mass percent:

Mass % of any component of the solution =

(Mass of the component in the solution / Total mass of the solution) x 100

Other methods are:

Volume percentage:

Volume % of a component =

(Volume of the component/Total volume of the solution) x 100

Mass by volume percentage:

It is the mass of solute dissolved in 100 mL of the solution.

i.e. Mass by Volume percentage =

(Mass of solute in grams/Volume of solution in mL) x 100

Here's a point to be KEPT in mind :

Whenever we say mass or volume of the solution, you need to add the respective masses and volumes of ALL the components of the solution. Do NOT commit the error of taking the mass or volume of only the solute or solvent in the denominators of the above expressions.

The concentration of a solution is most of the time expressed as the number of moles of solute present in 1 LITER of the solution (also CALLED molarity )

(There are also other ways to express concentration. PLEASE follow this link. )

EXAMPLE:

(a) If 25 moles of NACL are present in 100 L of a solution wherein H2O is the solvent, then the concentration of the solution is

25

100

=

0.25

mol⋅L

−

1

.

(b) What is the molarity of a solution prepared by dissolving 15.0 g of sodium hydroxide in enough water to make a total of 225 mL of solution?

Solution

Calculate the number of moles of solute present.

Moles of NaOH = 15.0 g NaOH ×

1

mol NaOH

40.00

g NaOH

= 0.375 mol NaOH

Calculate the number of litres of solution present.

Volume = 225 mL ×

1

L

1000

mL

= 0.225 L soln

Divide the number of moles of solute by the number of litres of solution.

Molarity =

0.375

mol

0.225

L

= 1.67 mol/L

SO2 + H2O -------> H2SO3 (weak acid)

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Answer:

BALANCED equation is an equation for a CHEMICAL reaction in which the number of atoms for each element in the reaction and the TOTAL charge are the same for both the reactants and the products. In other words, the MASS and the charge are balanced on both SIDES of the reaction.

because it is a natural...

Cologne (and alcohol in general) has a low VAPOR pressure, MEANING that it evaporates EASILY. When it evaporates, it ABSORBS heat energy from its surroundings (in this case, your forehead), which cools you down..

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ANSWER:

GRAPH will be FLATTER having SMALLER SLOPE...

ANSWER:

the answer is SEVENTY EIGHT

Aregentum is your ANSWER.

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Answer: 5%

Explanation: mass of solute(SUGAR)=2.5 g

                      mass of SOLVENT(water)=47.5 g

                    total mass of solution(sugar+water)=(47.5+2.5) g

                                                                              =50 g

               so,concentration by mass=mass(solute)/mass(solution)*100%

                                                            =(2.5/50)*100 %

                                                               =5%

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ANSWER:

C/5=(F-32)/9

=35/5=(F-32)/9

7×9+32=F

=F=63+32

=95°F

Having only a LIMITED ABILITY to REACT CHEMICALLY; chemically inactive

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Neutralization is a type of CHEMICAL reaction in which from BASES and acid REACT with each other to form SALT and water .

ANSWER:

IUPAC NAMING = 2- METHYL But-2-ene

ANSWER:

this is the answer to your QUESTION

Answer:

Explanation:

Moles of N−3 ION =4.242=0.1

Each nitrogen atom has 5 valence electrons.

Therefore, TOTAL number of electrons in N−3 ion =16

Total number of electrons in 0.1 MOLE or

4.2 g of N−3ion=0.1×16×NA

=1.6NA

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Postulates of Dalton's atomic theory:-

• Matter is made up of extremely small individual and Indestructible ultimate particles called atoms.

• Atoms of the same elements are identical in all RESPECTS in same SIZE mass and chemical properties.

• Atoms of different elements are different in all respects and have different masses and chemical properties.

• Atoms of two or more elements combine in a fixed RATIO to form compound atoms known as molecules.

• Chemical reaction involves only combination separation arrangement of atoms.

• Atoms can neither be created nor destroyed during any physical or chemical change.

The Contradiction between Modern theory and Dalton's atomic theory.

• According ACCORDING to the Delton atomic theory the atoms are indivisible but according to the Modern theory the atoms are indivisible into electron ,protons, and neutrons.

• According to Dalton's atomic theory the ATOM of same elements are identical but according to modern theory atoms of different elements cannot be identical known as isotope.

• according according to Delton atomic theory the matter can not destroyed but according to modern theory the matter is converted into energy.

EXPLANATION:

using microorganism LIKE yeast ...when they respire and producing METHANE,ethane and propane TYPES of gases....

ANSWER:

(a) is your answer

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ANSWER: The IUPAC of the GIVEN COMPOUND is Buta-1,3-diene.

2AgBr   --------------->      2AG + BR2

              (SUNLIGHT)

Answer:

(B) RATE of reaction is independent of the concentration of the REACTING species

Explanation:

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Answer:

Explanation:

Thermoplastics and thermosetting plastics are two separate classes of polymers, which are differentiated based on their behavior in the presence of heat. The material difference between the two is that thermoplastics can be remelted, while thermoset plastics remain in a permanent solid state once hardened. As a result of these physical qualities, thermoplastic materials have low melting points while thermoset plastic products can withstand high temperatures without losing austerity.Thermoplastics pellets soften when heated and become more fluid as more heat is administered. The curing process is 100% reversible as no chemical bonding takes place. This characteristic allows thermoplastics to be remolded and recycled without negatively affecting the material’s physical properties. There are a variety of thermoplastic resins that offer various performance benefits, but the majority of materials commonly offer high strength, shrink-resistance and easy flexibility. Depending on the resin, thermoplastics can SERVE low-stress applications such as plastic bags or high-stress mechanical parts. Examples of thermoplastic polymers include polyethylene, PVC, and nylon.  

Thermoplastic Advantages:

Highly recyclable

High-Impact resistance

Reshaping capabilities

Chemical resistant

Aesthetically superior finishes

Hard crystalline or rubbery surface options

Thermoplastic Disadvantages:

Expensive

Can melt if heated

THERMOSET CURING PROCESS (THERMOSETTING PLASTIC)

RIM DefinitionThermoset plastics, typically processed by reaction injection molding, contain polymers that combine together during the curing process to form a permanent chemical bond. This process forms WEAK bonds between the monomer chains within these materials and eliminates the risk of the product remelting when heat is applied, making thermosets ideal for high-heat applications like APPLIANCES and ELECTRONICS. Thermoset plastics greatly improve the material’s mechanical properties, providing enhanced chemical resistance, heat resistance and structural integrity. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. Examples of thermoset plastic polymers include epoxies, phenolics, silicones, and polyesters.  

Thermosetting Plastic Advantages:  

More resistant to high temperatures

Highly flexible design

Thick to thin wall capabilities

High levels of dimensional stability

Cost-effective

Thermosetting Plastics Disadvantages:

Can’t be recycled

More difficult to surface finish

Can’t be remolded or RESHAPED

ANSWER:

the answer is nitrogen

Explanation:

ANSWER: in displacement more REACTIVE metal DISPLACES less reactive

Explanation: in double displacement there is exchange of 2 IONS

Answer:

Acetic acid that is Carboxylic acids gives effervescence with NAHCO3 SOLUTION

Explanation:

Acectic acid that is CH3COOH gives effervescence.

This happened as there is a formation of CO2 in the reaction.

The reaction involved in this process is

CH3COOH + NaHCO3 ===> CH3COONa + H2O + CO2.

The lime WATER turns milky in the reaction.

Effervescence is basically formation of bubbles in a liquid.

The process involved is Neutralization.

Brisk effervescence is formed that is there is formation of quick bubbles.

NaHCO3 is a salt compund and is also known as baking soda.

Hence,

Acetic acid that is Carboxylic acids gives effervescence with NaHCO3 solution.

ANSWER:

Cementite (or iron CARBIDE) is a compound of iron and carbon, more precisely an intermediate TRANSITION METAL carbide with the formula Fe3C. By ... In carbon STEEL, cementite