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Class 10 Class 12

Given the reaction between two gases represented by A2 and B2 to give the compound AB (g).
A2(g) +B2 (g)  ⇌ 2AB (g)
At equilibrium the concentration
of A2 = 3.0 x 10-3 M
of B2 = 4.2 x 10-3 M
of AB = 2.8 x 10-3 M
If the reaction takes place in a sealed vessel at 527oC, then the value of Kc will be

• 2.0

• 1.9

• 0.62

• 4.5

C.

0.62

A2 (g) +B2 (g)  ⇌ 2AB (g)
The equilibrium constant is given by

A2 (g) +B2 (g)  ⇌ 2AB (g)
The equilibrium constant is given by

1200 Views

The exothermic formation of ClF3 is represented by the equation

Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3?

• Increasing the temperature

• Removing Cl2

• Increasing the volume of the container

• Adding F2

D.

Adding F2

425 Views

If the value of an equilibrium constant ofr particular reaction is 1.6 x1012 then at equilibrium the system will contains

• all reactants

• mostly reactants

• mostly products

• similar amounts of reactants and products

C.

mostly products

For a reaction,

So, mostly the product will be present in the equilibrium mixture.

For a reaction,

So, mostly the product will be present in the equilibrium mixture.

1313 Views

Which of the following salts will give highest pH in water?

• KCl

• NaCl

• Na2CO3

• CuSO4

C.

Na2CO3

The highest pH refers to the basic solution containing OH- ions. Therefore, the basic salt releasing OH- ions on hydrolysis will give highest pH in water.
Only the salt of a strong base and weak acid would release OH-ion on hydrolysis. Among the given salts, Na2CO3 corresponds to the basic salt as it is formed by the neutralisation of NaOH [strong base] and H2CO3 [weak acid].

The highest pH refers to the basic solution containing OH- ions. Therefore, the basic salt releasing OH- ions on hydrolysis will give highest pH in water.
Only the salt of a strong base and weak acid would release OH-ion on hydrolysis. Among the given salts, Na2CO3 corresponds to the basic salt as it is formed by the neutralisation of NaOH [strong base] and H2CO3 [weak acid].

1725 Views

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

•  Base Acid End Point Strong Strong Pink to colourless
•  Base Acid End Point Weak Strong Colourless to pink
•  Base Acid End Point Strong Strong Pinkish Red to Yellow
•

 Base Acid End Point Weak Strong Yellow to Pinkish Red

D.

 Base Acid End Point Weak Strong Yellow to Pinkish Red

Methyl orange is the weak organic base. It is used in the titration of WB vs SA

In a basic medium, equilibrium lies in the backward direction and therefore it shows yellow colour.

In acidic medium, equilibrium shifts in forwarding direction and therefore, colour changes from yellow to red.

Methyl orange is the weak organic base. It is used in the titration of WB vs SA

In a basic medium, equilibrium lies in the backward direction and therefore it shows yellow colour.

In acidic medium, equilibrium shifts in forwarding direction and therefore, colour changes from yellow to red.

For a spontaneous reaction the ∆G, equilibrium constant (K) and Eocell will be respectively

• -ve, >1, +ve

• +ve, >1, -ve

• -ve, <1, -ve

• -ve, >1, -ve

A.

-ve, >1, +ve

169 Views