Chemis Composition


Time: 1 Hour

Max. Marks: sixty



Answer has to be written possibly in English or the channel of instruction of the prospect in secondary school.


It will have no unfavorable marking


Use of calculators or graph papers can be not authorized


There are TWENTY concerns. Answer the questions.



1 .

The reaction between dichromate ions and iron (II) ions can be carried inside the presence of either water down HCl (or) sulphuric stomach acids. But the thin down HCl may not be used to alkalify the solution intended for titration among Iron (II) and permanganate ion system. The reason for this can be ________.

installment payments on your

Acetic acid can be described as weak acid and hydrochloric acid can be described as strong acid solution it employs that the (A) pH from the 0. 1M HCl will be 1

(B) Solution that contain 0. 1 mole acetic acid and 0. 1 gopher of sodium acetate is a good barrier

(C) pH of the zero. 1M HCl will be lower than that of 0. 1M acetic acid (D) pH of a answer formed simply by mixing equimolar quantities of sodium hydroxide and HCl will be increased that of a similar solution shaped from sodium hydroxide and acetic acid. The best statement(s) is/are ________________

a few.

A metallic oxide features formula X2O3 it can be decreased by hydrogen to give totally free metal and water. zero. 1596 g of steel oxide requires 6 mg of hydrogen for total reduction. The atomic excess weight of the steel is __________.


Helium is mixed with the fresh air gas to get deep ocean divers. The percent by simply volume of air gas inside the mixture of the diver has to submerge to a depth where the total pressure is four. 2 credit and partially pressure of oxygen is definitely maintained in 0. two atm at this depth can be ___________.

your five.

In the effect A & B в†’ products, in the event the concentration of B is kept continuous and concentration of A is usually doubled, the rate becomes 4 times of first rate and when A can be kept frequent and attentiveness of W is doubled rate is still the same. This indicates that reaction rate is definitely proportional for the __________ of concentration of ___________ and rate formula is _____________.


One particular ________ of the substance is usually equal to their atomic or molecular mass expressed in __________ and has 6. 023x1023 chemical debris, which is known as ______________ of particles. Since 1 skin mole of virtually any chemical substance includes same quantity __________ because 1 skin mole of any other chemical substance, we can calculate the weight of one chemical that could react using a given weight of additional by using all their _________ in other calculations.


15 skin moles of H2 and a few. 2 moles of I2 are mixed and allowed to attain balance. Concentration of HI is found to be 10 moles the equilibrium constant for the formation of HI can be ____________.

one particular


six-hundred ml of any mixture of UNITED KINGDOM and O3 weighs 1 gram at NTP. The volume of ozone in the mixture _______.

being unfaithful.

At 270C 4. 6th grams of N2O4 undergoes decomposition and exerts an equilibrium pressure of 1. 6 atmosphere the moment vapourised in a 1 lighted flask. The fraction of N2O4 dissociated is ________. [N2O4(g)


10. A compound contains 28% nitrogen and 72% metal by mass. 3 atoms with the metal match 2 atoms of the nitrogen. The atomic weight of the metal is definitely __________ Represents 5x1=5

14. The Versus. D of Gas is usually 15. 15 g on this gas can occupy a volume of ______ cc for 2730C and 1 atm.

12. You are given 500 ml of 2N HCl and five-hundred ml of 5N HCl. The maximum volume of the 3 M that you can make from these two solutions is definitely ___________.

13. The balance constant to get the reaction 2A + 2B

2C + 2D can be 100. The equilibrium

continuous for the A + B

C + G at same temperature is definitely _________.

16. The solubility product of sparingly soluble salt Ag2CrO4 is 4x10-12. The gustar solubility from the salt can be _____________

15. For the preparation of HBr inside the lab the corresponding bromide sodium should be cured with __________ acid.


Marks 10x2=20

16. Distinguish the following:


Redox effect


disproportionation reaction


Primary standard substance


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