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A gas at a pressure of 1 atm is compressed at a cons†an t pressure from 10 litre to 2 litre. If 500J of heat leaves the gas, claculate the work done on the gas and the change in the internal energy

4. The addition of HBr is easiest with 1.CH2=CH-Cl 2.Cl-CH=CH-Cl 3.CH3-CH=CH2 4.(CH3)2C=CH2

Total number of lone pairs of electron in I−3 ion is:

50 ml solution of BaCl2 20.8% (weight by volume) and 100 milliliter solution of H2SO4 (9.8% weight by volume) are mixed BaSO4 formed is (a) 23.3 g (b) 46.6 g (c)29.8 g (d)11.65 g

What happens when 2,2-Dimethylpropan-1-ol reacts with HBr in presence of sulphuric acid? What will be the mechanism and how to determine the type of mechanism followed?

Calculate the wavelength of first line in the balmer series of hydrogen spectrum

Write structures of different dihalogen derivatives of propane.

The pressure of 1 g of an ideal gas A at 300 K is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature, the pressure becomes 3 bar. Which of the following is correct?(mA=mass of gas A; mB mass of gas B)

Which combination is best explained by the co-ordinate covalent bond

10 grams of caco3 contains how many moles of oxygen

find the volume of co2 at NTP obtained on heating 10g of 90% pure limestone ?

71 Arrange the following in order of increasing bond strength F2,n2,cl2,o2 ?

2-methylcyclopent-1,3-diene+ HBr \xrightarrow[{(1,4 addition)}]{40C}X (major)

What is the molarity of 4.9% H\underset{}{3PO\underset{}{4 solution by mass (density of H3PO4 =1.22 g/ml)

A sample of AgCl was treated with 5.00 ml of 1.5 (M) Na_2CO_3 solution ^ to give Ag_2CO_3. The remaining solution contained 0.0026 gL^{-1} of Cl^-. Calculate the solubility product of AgCl. \lbrack K_{sp}(Ag_2CO_3)=8.2×10^{-12}\rbrack

The number of possible isomers for the complex [Co(en)2Cl2]Cl will be: (en = ethylenediamine)

Is it necessary that in cine substitution, the leaving group and the incoming nucleophile are at the same position on the phenyl ring?

Which of the following is a catabolic pathway?

19. Which of the following chemical equation is not balanced? 1. 3Fe +4H_2O ----- Fe_3O_4+4H_2O 2.4NH_3+8O_2------ 4NO+ 6H_2O 3. 4Na + O_2------ 2Na_2O

A compound contain 3.2%oxygen what is molecular weight of compound

If in face centered unit cell no of cells is 4 then how come the octahedral voids are 12

If the Normality of acid and base is equal then what is the Normality of mixture?

Number of chiral centres present in glucopyranose &amp; fructofuranose are p &amp; q respectively p + q equals to ___

what volume of hydrogen gas,at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elememtal boron (atomic mass=10.8) from the reductionof boron trichloride by hydroge

One of the solutions of ax + by = 2 is

The most abundant metal(discount metalloids) on the earth’s crust is __

Why do the transition elements have higher enthalpies of atomisation? In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?

Solve the following using suitable rearrangements :196 × 13 + 4 × 13 - 50 × 13

Elements of group 14 (a) exhibit oxidation state of +4 only (b) exhibit oxidation state of +2 and +4 (c) form M2– and M4+ ion (d) form M2+ and M4+ ions

the molar concentration of H+ ion when 0.1M of 200 ml HCl is mixed with 0.05 M of 300 ml H2SO4 is

26. Do did electron species participate in hybridization. E.g. NO and NO2

compare and contrast between electron,proton and neutron.

Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?

22 Find the change in pH value of buffer solution when 50mL M/10 HCL is added to a buffer containing 100ml M/10 Ch3cooh and 100mL M/10 CH3CooNa (pKa = 4.74)

8 Which among the following show tautomers? (1) Alcohols (2) Phenol (3) Ethers (4) Anisole

In equilibrium calculation why in some cases we consider concentration of water to be 1 while in other cases concentration of water to be 55.55?Where should we use 1 and 55.55

Why bond angle in amine is less than 109.5 degree ?

The oxidation state of Cl2 is

Which of the following will undergo a faster SN1?

66. In acidic medium Mno2 is an oxidant as Mno2(s) +4H(+) +2e(-) gives Mn2+ + 2H20 If pH of the solution is decreased by one unit, the electrode potential of the half cell Pt:Mno2; Mn2+ will change by

62. One mole of anhydrous salt AB dissolve in water and liberate 21joule per mole of heat. The value of delta heat hydration of AB is - 29.4joule per mole. The heat of dissolution of hydrated salt AB.2H2O is

Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with a characteristic smell. A and Y are respectively:

Calculate the standard enthalpy of formation of CH3OH(l) from the following data:CH3OH(l) + O2(g) CO2(g) + 2H2O(l) ; ΔrHθ = –726 kJ mol–1C(g) + O2(g) CO2(g) ; ΔcHθ = –393 kJ mol–1H2(g) +O2(g) H2O(l) ; ΔfHθ = –286 kJ mol–1.

28.at some place atmosphereic pressure is 74cmHg and temperature is 27degree C.at another place atmospheric pressure is 70mm Hgand temperature is 23 degree c .compare the densities of the air at the two places.

Which of the following polymers of glucose is stored by animals?

Which of the following reaction is a redox reaction

the mass of urea requiired in making 5kg of 5 molal aq.solution is

When Ph−OH reacts with C2H5I with anhydrous C2H5OH as the solvent in the presence of ethoxide ions, what is the product of this reaction?

Arrange the following alkenes in the order of their stability.

Number of chiral centres present in glucopyranose & fructofuranose are p & q respectively p + q equals to ___