States of Matter Test

Result

States of Matter Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

An aqueous solution containing liquid $$A(M.\ wt.\ =128)\ 64\%$$ by weight has a vapour pressure of $$145\ mm\ Hg$$. If the vapour pressure of water is $$155\ mm\ Hg$$ then vapour of $$A$$ at the same temperature will be

A
$$205\ mm\ Hg$$

B
$$105\ mm\ Hg$$

C
$$185\ mm\ Hg$$

D
$$52.5\ mm\ Hg$$

Solution
Question 2
1 / -0

Which of the following attraction is strongest?

A

B

C

D
Question 3
1 / -0

A reaction follows the given concentration (M)- time graph. The rate for the reaction at 20 seconds will be

A
410 MS

B
810 MS

C
210 MS

D
710 MS
Question 4
1 / -0

Liquids $$A$$ and $$B$$ form an ideal solution. At $$30^o$$ C, the total vapour pressure of a solution containing $$1$$ mol of $$A$$ and $$2$$ mols of $$B$$ is $$250$$ mm $$Hg$$. The total vapour pressure becomes $$300$$ mm $$Hg$$ when $$1$$ more mol of A is added to the first solution. The vapour pressures of pure $$A$$ and $$B$$ at the same temperature are

A
$$450, 150$$ mm $$Hg$$

B
$$150, 450$$ mm $$Hg$$

C
$$250, 300$$ mm $$Hg$$

D
$$125, 150$$ mm $$Hg$$

Solution
Question 5
1 / -0

$$n$$ moles of Helium gas are placed in a vessel of volume $$V$$ Litre. At T K, if $$V_{1}$$ is free volume of Helium then diameter of He atom is

A
$$\left[\dfrac{3}{2}\dfrac{V_{1}}{\pi N_{A}n}\right]^{1/3}$$

B
$$\left[\dfrac{3}{2}\dfrac{(V-V_{1})}{\pi N_{A}n}\right]^{1/3}$$

C
$$\left[\dfrac{6(V-V_{1})}{\pi N_{A}n}\right]^{1/3}$$

D
$$\left[\dfrac{6V_{1}}{\pi N_{A}n}\right]^{1/3}$$

Solution
Question 6
1 / -0

Consider a binary mixture of volatile liquids. If at $$X_A=0.4$$ the vapour pressure of solution is $$580\ torr$$ then the mixture could be $$(p_{A}^{0}=300\ torr, p_{B}^{0}=800\ torr)$$

A
$$CHCl_3-CH_3COCH_3$$

B
$$C_6H_5Cl-C_6H_5Br$$

C
$$C_6H_6-C_6H_5CH_3$$

D
$$nC_6H_{14}-nC_7H_{16}$$

Solution
Question 7
1 / -0

An ideal gas is compressed in a closed container its U?

A
Increases

B
Decreases

C
Remains same

D
Both $$(1)$$ & $$(2)$$

Solution

When an ideal gas is compressed in a closed container, its internal energy U increases. Compressing an ideal gas increases its temperature and its internal energy increases since U = f(t) for an ideal gas.
Question 8
1 / -0

45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below :
$$2N_{2(g)}+O_{2(g)}. \rightarrow . 2N_2O_(g)$$
Which law is being obeyed in this experiment?

A
Gay Lussac's law

B
Law of definite proportion

C
Law of multiple proportion

D
Avogadro's law

Solution
Question 9
1 / -0

Calculate solubility (in moles / litre) of a saturated aqueous solution of $$Ag_3PO_4$$ if the vapour pressure of the solution becomes 750 torr at 373 K
(Assume molality=molarity).

A
$$2/15$$

B
$$1/30$$

C
$$10/54$$

D
$$20/27$$

Solution