Two elements A and B form compounds of formula AB 2 and AB 4- When dissolved in 20-0 g of benzene 1-0 g of AB 2 lowers freezing point by 2-3- C whereas 1-0 g of AB 4 lowers freezing point by 1-3- C- The K f for benzene- The atomic masses of A and B areA- 27-45B- 42-25C- 52-48D- 48-52

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Standard XII

Chemistry

Depression in Freezing Point

Two elements ...

Question

Two elements A and B form compounds of formula AB₂ and AB₄. When dissolved in 20.0g of benzene 1.0g of AB₂lowers freezing point by 2.3^°C whereas 1.0g of AB₄ lowers freezing point by 1.3^°C. The K_f for benzene. The atomic masses of A and B are

27, 45

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42, 25

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52, 48

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48, 52

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Solution

The correct option is A 27, 45

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Two elements A and B form compounds of formula AB₂ and AB₄. When dissolved in 20.0g of benzene 1.0g of AB₂lowers freezing point by 2.3^°C whereas 1.0g of AB₄ lowers freezing point by 1.3^°C. The K_f for benzene. The atomic masses of A and B are

Q. Two elements

A

and

B

form ideal compounds of formula

A B_{2}

and

A B_{4}

. When dissolved in

20.0 g

of benzene

1.0 g

A B_{2}

lowers freezing point by

{2.3}^{0} C

whereas

1.0 g

A B_{4}

lowers freezing point by

{1.3}^{0} C

. The

K_{f}

for benzene is

5.4

. The atomic masses of

A

and

B

are:

Q. Two elements

A

and

B

form compounds having formula

A B_{2}

and

A B_{4}

. When dissolved in

20 g

of benzene

(C_{6} H_{6}), 1 g

A B_{2}

lowers the freezing point by

2.3 K

whereas

1.0 g

A B_{4}

lowers it by

1.3 K

. The molar depression constant for benzene is

5.1 K k g m o l^{- 1}

. Calculate atomic masses of

A

and

B

Q. Two elements 'A' and 'B' form compounds having molecular formulae

A B_{2}

and

A B_{4}

when dissolved in

20.0 g

of benzene,

1.0 g

A B_{2}

lowers the freezing pioint by

{2.3}^{\circ} C

whereas

1.0 g

A B_{4}

lowers the freezing point by

{1.3}^{\circ} C

. The molal depression constant for benzene is

5.1 K k g m o l^{- 1}

. Calculate the atomic masses of A and B.

QUESTION 2.21

Two elements A and B form compounds having formula $A B_{2}$ and $A B_{4}$ . When dissolved in 20 g of benzene $(C_{6} H_{6})$ , 1 g $A B_{2}$ lowers the freezing point by 2.3 K whereas 1.0 g of $A B_{4}$ lowers it by 1.3K. The molal depression constant for benzene is 5.1 K kg $m o l^{- 1}$ . Calculate atomic masses of A and B.

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Two elements A and B form compounds of formula AB2 and AB4. When dissolved in 20.0g of benzene 1.0g of AB2 lowers freezing point by 2.3°C whereas 1.0g of AB4 lowers freezing point by 1.3°C. The Kf for benzene. The atomic masses of A and B are

The correct option is A 27, 45

Two elements A and B form compounds of formula AB₂ and AB₄. When dissolved in 20.0g of benzene 1.0g of AB₂lowers freezing point by 2.3^°C whereas 1.0g of AB₄ lowers freezing point by 1.3^°C. The K_f for benzene. The atomic masses of A and B are