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Calculate the wavelength of the first line in the Balmer series of hydrogen spectrum.

The major product of the following reaction is:

A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 litre (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate : Molecular formula.

Which of the following contains more number of oxygen atoms?

The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40 respectively. The protective powers of A, B, C and D are in the order:

7. Can dihydrogen act as a reducing agent if not why??

The molarity of an aqueous solution of glycol is 12 M. The density of the solution is 1.392 g/mL. Find the mole fraction of glycol.(Given, molar mass of glycol =62 g/mol)

Observe the following reaction and find out that how many number of reactant stereoisomers can be reduced to optically inactive meso product.

Which one of the following structures represents nylon 6, 6 polymer ?

Electron affinity order from Lithium to Neon in period

Out of white phosphorus and red phosphorus, which one is more reactive and why?

Which one of the following option(s) is correct?

Regarding benzene some statements are given below A) Benzene is an aromatic hydrocarbon B) Benzene undergoes substitution reactions more easily than addition reactions C) Resonance energy of benzene is 150.48 kcal/mol

The IUPAC name for

Compare the stability of +2 oxidation state for the elements of the first transition series.

15. Conversion of chlorobenzene to 2-chlorotoluene

10. vapour density of the equilibrium mixture of the reaction SO2Cl2 --->SO2 + Cl2 is 50.0. percent dissociation of SO2Cl2 is: a)33.33 b)35.0 c)30.0 d)66.67

The correct order of ionic radii is:

Which of the following functional group(s) shows metamerism?

An industrial waste water is found to contain 8.2% Na3PO4, and 12% MgSO4 by weight in solution. If % ionization of Na3PO4 and MgSO4 are 50 and 60 respectively then it’s normal boiling point (in oC) is: [kb(H2O)=0.50 K kg mol−1]:

The number of stereoisomers possible for [Co(ox)2(Br)(NH3)]2− is____.[ox = oxalate]

26 Give the mechanism and explanation of benzoin reaction

80 How many optically active isomers are possible for C5H11Cl and what are they?

hooks law statement and derivation handwritten explain

The no of solution of summation cosrx (r=1to6) =6 in 0 to 2pi is

Which of the following does not have a pseudo noble gas configuration?

Write down the electronic configuration of the following :(a) 2713 X (b) 3517 YWrite down the number of electrons in X and neutrons in Y.

why cant an sp bond be a pie bond

What is a temperature at which all gases have zero volume

6. The average molar mass of a mixture of CO(g) and CO2(g) is 37.The mole percentage of CO(g) in the mixture is approximately

If 1gram of copper on oxidation gives 1.252grams of copper oxide. Find the formula of copper oxide.

In a practicle unit if the unit of mass becomes double andthat of unit of time becomes half then 8 joules will be equalunit of workto64110

Write the following sentences in French.1. We have a brother.2. They have some books.3. You have a car?4. I have a school bag.5. She has a wrist watch.

0.1 M weak acid HA (pH 3) is titrated with0.05 M NaOH solution. Calculate the pH (approx.)when 25% of acid has been neutralised. (log 3=0.48)

Assimilatory Power synthesized during photochemical phase of photosynthesis incudes

2 g of acetate ions in the form of sodium acetate are added to 500 mL of a 0.10 Macetic acid solution of pKa(CH3COOH)=4.74. What is the pH of the final solution?

Rifle Bullet losses one by 20 of its velocity in passing through a plank. the least number of such planks required to just stop the a bullet is

Complétez avec l'article défini ou indéfini.(le, la, les, ou un, une, des)

Use the formula λmT=0.29 cm K to obtain the characteristic temperature ranges fordifferent parts of the electromagnetic spectrum. What do the numbersthat you obtain tell you?

In a cubic lattice, atom X occupies the corners of the cube and atom Y occupies the end-centred positions and Z occupies the edge centres of the cube. What will be the simplest formula of the unit cell if one of the face diagonals containing end centre atom is removed?

Two isomeri conpounds Cl-CH2-CH2-CH2Cl and CH3-CH2-CHCl2 can be distinguished by1.HOH/OH-2. Tollens reagent 3 . Both HOH/OH- and tollen's reagent 4. HOH/OH- tollen's reagent and cerric ammoniun nitrate

An aqueous solution of CH3OH is 32% (w/w). Find the Fraction of CH3OH in the solution.A)0.79B)0.209C)0.1D)0.47

Why cos x.d/dx.1 =0 ?

Identify C in the following reaction sequence.

ntpolonium adopts cubic structure with edge length of cube being o.336nm.the distance between the polonium atoms which lie at the corners along the body diagonal?n

Write reactions to justify amphoteric nature of aluminium.

10 mL of one millimolar surfactant solution forms a monolayer, covering 0.24 cm2 on a polar substrate. If the polar head is approximated as a cube, what is its edge length in pm? Take NA=6×1023

The equivalent weight of phosphoric acid (H3PO4) in the reaction : NaOH+H3PO4→NaH2PO4+H2O (correct answer +1, wrong answer -0.25)

Roasting is done generally in case of the

xC3H8 +yO2 zCO2 +qH2O Find n-factor for C3H8, O2, CO2, H2O in the reaction.