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why u have written 100 above pls explain

it is molality so we have to write 1000 I'm confused please explain

Sorry, it seems there is a mistake. It should be 1000 in the numerator. Then, the answer is 600.

that means no option is correct

(2) 600

m = 1000 × 5.2 × 6/0.52 × 100 = 600

Acids :Acids are sour in taste, turn blue litmus to red, dissolve in water to release H+ions.

E.g., vinegar, hydrochloric acid and sulphuric acid.

•Reaction with Metal

Acid + Metal → Salt + Hydrogen gas

e.g., 2HCl + Zn → ZnCl2+ H2

•Reaction with Metal carbonate

Acid + Metal carbonate → Salt + CO2+ H2O

e.g., 2HCl + Na2CO3→ 2NaCl + CO2+ H2O

•Reaction with Metal hydrogen carbonate

Acid + Metal hydrogen carbonate Salt + CO2+ H2O

e.g. HCl + NaHCO3→ NaCl + H2O + CO2

•Reaction with Metallic oxide

Acid + Metal oxide → Salt + Water

e.g. 2HCl + CuO → CuCl2+ H2O

•Acids in water:

Acids produce H+ions when dissolved in water. H+ ions cannot exist alone. They combine with water molecule (H2O) to form H3O+(hydronium ions). It conducts electricity.

•Decrease in H30+ ions concentration per unit volume results in formation of dilute acids.

•It is a highly exothermic reaction.

Acids when dissolved in water release large amount of heat. If water is added to concentrated acid then the heat generated may cause the mixture to splash out and cause bums. Hence to avoid burns acid must be added drop wise into water with constant stirring. So that the heat generated spreads over in water.

strong acids → release more H+ions → HCl

weak acids → releases less number of H+ions → acetic acid

strong base → give more OH– ions → NaOH

weak base → gives less OH– ions → CH3COOH

Bases:Bases are bitter in taste, turns red litmus to blue and when dissolved in water releases OH– ions;

e.g., NaOH and KOH.

•Reaction with metal

Base + Metal → Salt + H2gas

e.g., 2NaOH + Zn → Na2ZnO2+ H2

This reaction is possible only with reactive metals like sodium and potassium.

•Reaction with non-metallic oxide

Base + Non-metallic oxide → Salt + H2O

Bases in water → Bases produce OH– ions when dissolved in water. Bases soluble in water are called alkalis. It conducts electricity.

•Decrease in OH– ions single concentration per unit volume results in formation of dilute bases.

•It is a exothermic reaction.

To make basic solution, base must be added drop wise into water with constant stirring, so that the heat generated spreads over in water.

Indicators:Indicators are those substances which tell us whether a substance is acidic or basic by change in colour. For e.g., litmus solution.

•Olfactory indicators: Those substances whose odour changes in acidic or basic media are called lfactory indicators. For e.g., clove, vanilla, onion.

•Natural indicators: Turmeric, litmus (obtained from lichen)

•Synthetic indicators: Methyl orange, phenolphthalein.

Aneutralization reactionis when an acid and a basereactto form water and a salt and involves the combination of H+ions and OH-ions to generate water. Theneutralizationof a strong acid and strong base has a pH equal to 7.

The following are some examples of neutralization reactions to form salts. The carbonic acid then further reacts with the limewaterin the neutralization reaction.

We should take a base such as a antacid tablet or milk of magnesia because it neutralises the effect of acid.

When weak acids and bases react, the relative strength of the conjugated acid-base pair in thesaltdetermines the pH of its solutions. Thesalt, or its solution, soformedcan be acidic, neutral orbasic. Asalt formedbetween a strong acid and a weak base is an acidsalt, for example NH4Cl.

salt is made by neturalization of acid and base. Salts are ionic compounds that contain two groups of positively charged ions (H+) and negatively charged ions (OH-)

write answer

The atomic no. of Gd is 64. Electronic configuration is (Xe)4f*7 5d*1 6s*2. In Gd +3, there are 61 electrons. Hence electronic configuration will be( Xe)4f*7. Hence no electrons are there in outer d orbital. Due to this it is colourless

thanks

It's because Sc3+ does not have any electrons left in its d orbital. Sc has the electron configuration [Ar](4s)2(3d)1 but in order to get its +3 oxidation state, it has to lose 3 electrons, starting with the two 4s electrons and followed by the lone 3d electron. Sonce there are no more d electrons, electronic transitions are not gonna happen at the visible range of the electromagnetic radiation hence Sc3+ appears colorless.

nCH2=CHCl (vinyl chloride) ------> (-CH2-CHCl-)n , which is polvinyl chloride

In 100g of sample of the compound, 4.07g of hydrogen, 24.27g of carbon and 71.65g of chlorine are present.

Moles of hydrogen= 4.07g/ 1g = 4.0 Moles of carbon= 24.27g/ 12g = 2.0 Moles of chlorine= 71.65g/35g = 2.0

Since 2.0 is the smallest value, so by dividing each of the mole values obtained by this smallest value we will get a ratio of 2:1:1 for H:C:Cl.

Thus, the empirical formula of the compound is CH2Cl.

For CH2Cl, empirical formula mass= 12+ (2×1) +35 = 49g. n = Molar mass/ empirical Formula mass= 98.96g/ 49g = 2

Therefore, Empirical formula = CH2Cl n=2

Hence, molecular formula= C2H4Cl2.

The most important properties of catalysts are:

1. A catalyst increases the speed of a reaction, and it also improves the yield of the intended product.

2. A catalyst actually takes part in the reaction even though it itself is not consumed or used up in the course of the reaction.

3. A catalyst makes the reaction faster by providing an alternative pathway with a lower activation energy.

4. A catalyst is reaction-specific. It may not be effective in another reaction even if the two reactions are of similar type.

5. In a reversible reaction, a catalyst accelerates both the forward and the reverse reactions. So, the inclusion of a catalyst does not alter the equilibrium constant of a reversible reaction.

different phases

Since quartz glass in an amorphous solid having short range order of constituents. Hence value of refractive index is same in all direction, can be measured and not be equal to zero

(a)Same in all direction

2Mg + O2 = 2 MgO

H2 + 1/2O2 = H2O

(i) When ethanol reacts with chromic anhydride, only partial oxidation occurs and ethanol is formed. On the other hand, when ethanol is heated with alkaline KMnO4, it produces ethanoic acid due to complete oxidation.

(ii) When propanone reacts with hydrogen cyanide, a molecule of H—CN is added across the carbon-oxygen double bond of propanone. Hence, addition reaction occurs.

(iii) To prevent the misuse of alcohol supplied for industrial purposes, it is made unfit for drinking. This can be done by mixing it with poisonous substances such as copper sulphate, methanol, pyridine, etc. The alcohol thus obtained is called denatured alcohol.

A fuel is a source or substance which produces energy.

-n2- x = -n1.... mass balance

=> x = n1-n2

option c

thanks

Uses of bleaching powder: 1. It is used for bleaching dirty clothes in the laundry, as a bleaching agent for cotton and linen in the textile industry. 2. It is a strong oxidizing agent hence used as an oxidizer in many industries.3. It is used as a disinfectant which is used for disinfecting water to make potable water.

In chemistry,catenationis the bonding of atoms of the same element into a series, called a chain. ...Catenationoccurs most readily with carbon, which forms covalent bonds with other carbon atoms to form longer chains and structures. This is the reason for the presence of the vast number of organic compounds in nature.

options is 1( catenation property) is answer

कार्बन का परमाणु आपस मे संयोग करके सृन्खला बनाने का गुण रखते है कार्बन के उसी गुण को कार्बन का सृन्खलन गुण कहते हैं

कार्बन के द्वारा कार्बन के ही दूसरे परमाणुओं के साथ सहसंयोजी बंध बनाकर श्रृंखला का निर्माण श्रृंखलन (CATENATION) कहलाता है।कार्बन में कार्बन के परमाणु के साथ ही श्रृंखला बनाने की अप्रतिम क्षमता है, इस क्षमता के कारण कार्बन के परमाणु दूसरे कार्बन के परमाणु के साथ बंध बनाकर सीधी लम्बी श्रृंखला के अलावे विभिन्न शाखाओं वाली श्रृंखला तथा वलय के आकार में श्रृंखला का निर्माण करता है। कार्बन दूसरे कार्बन के परमाणुओं के साथ एकल बंध व्दि आबंध तथा त्रिआबंधों का निर्माण भी करता है। कार्बन के परमाणुओं के साथ साथ दूसरे तत्वों के परमाणुओं के साथ भी बंध बनाकर यौगिक का निर्माण करता है।

making bond with atoms or molecules is called the catenation property of the carbon!

Elements like carbon have property or say ability to form incredibly long chains with same atoms and this property is known as catenation. By chains I mean covalent bonds.

Themodern periodic lawwas proposed by Moseley. Thus themodern periodic lawcan be stated as:

"The chemical and physical properties of elements are the periodic functions of their atomic numbers and electronic configurations."

This means that there occurs a periodic recurrence in physical and chemical properties of elements when they are arranged on the basis of their increasing atomic numbers.

Specific heat Cp and Cv. Solids and Liquids have one specific heat but gases have two specific heats.

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Thediode valveis socalledbecause it has just two electrodes – the cathode and the anode. These correspond to the two electrodes of the originaldiode valve,the cathode being the electrode that is heated and emits electrons, and the anode being the electrode that collects the electrons

Hey mate,

your answer is-

Sodium hydroxide

thnx...

Ans :- Under this policy many PSU's were sold to private sector. Literally speaking, privatisation is the process of involving the private sector-in the ownership of Public Sector Units (PSU's). The main reason for privatisation was in currency of PSU's are running in losses due to political interference.

vitamin K is present in smaller quantities.

chromium oxide CrO2 shows antiferromagnetism.The substances in which the magnetic moment is aligned in such a way that the net magnetic dipole moment is zero.

Thank you

pls you may also give the resonating structure of CO3^ 2-

But in 1L of air there is only 200ml of oxygen.

In 10L of air(200*10)=2L of oxygen will be present.

Therefore 10L of air is required.

1 l of air contains 200 ml of oxy gen's In 10 l of air (200×10) =2l of oxygen will be present So 10 lis required

option (3) is the correct answer

2. 0.25Lyman series of the hydrogen spectrum can be represented by the equation: v=3.2881 x10^15 s^-1(1/1^2-1/n^2) (where n=2,3,...)1/wavelength = R*(1-1/n^2), where R is the Rydberg constant for hydrogen = 1.0974 x 10^7 m^-1. Since we're looking at 1/wavelength, the minimum wavelength will occur when 1/wavelength is a maximum, which happens when n goes to infinity (thus 1/n^2 goes to 0), and 1/wavelength = R. Thus, the minimum wavelength is 1/R = 91.12 nmBalmer's original formula was Wavelength = 3645.6 . 10^–10 ( n^2 / (n^2 – 4) ) When n => infinity Wavelength = 3.6456 . 10^–7 m ( or 364.5 nm)Ratio will be 91.2/364.5=0.25