Chemistry Test 155

Result

Chemistry Test 155

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Weekly Quiz Competition

Question 1
4 / -1

The ΔH of adsorption at constant amount of vapour adsorbed is called the isosteric enthalpy of adsorption. The adsorption of gas A on charcoal amounted to 0.894 cm³ (STP)/g at (0.4 atm and 200 K) and (at 59.2 atm and T K). If Δ_⊖H = 16.628 kJ/mol, then the value of T is :

(ℓn 148 = 5)

A
200 K

B
400 K

C
600 K

D
800 K

Solution
Question 2
4 / -1

If a given mass of (Y) gives 6 eq. of product P in the above reaction, then if same mass of (Y) is treated with 20g of NaOH making 1.5 litres of aq. solution, then what should be the pH of this solution ?

(Given : log 2 = 0.30, log 3 = 0.48), pKa of (Y) = 10.

A
10.3

B
9.7

C
10

D
5.48

Solution

Moles of (Y) = 1

Moles of NaOH = 0.5

pH = pKa = 10
Question 3
4 / -1

A metal exhibits the valencies 1 and 3. When higher metal halide is strongly heated, it decomposed into lower halide and halogen gas. When 29.6 gm of higher metal halide is decomposed completely, 15.4 gm of lower halide is produced along with 4.48 L of halogen gas X₂ (measured at 0°C and 1 atm). Which of the following statement is incorrect on the bases of these information?

A
In XO₂, X is sp² hybridised

B
X₂O₆ is diamagnetic

C
XO₂ is paramagnetic

D
XO₂ is diamagnetic

Solution
Question 4
4 / -1

(I) CH₃–CH₂–SH (II) (III) Et–OH

Arrange in the order of pKa.

A
II < I < III

B
III < I < II

C
III < II < I

D
II < III < I

Solution

CH₃–CH₂–SH pKa = 10.5

Ph–SH pKa = 7.8

Et–OH pKa = 15.9
Question 5
4 / -1

Total number of enol for the compound formed during given reaction will be (Including stereoisomer)

A
2

B
4

C
1

D
3
Question 6
4 / -1

Directions For Questions

An organic compound (A) C₃H₆Cl₂ on reduction with red P and HI gives propane. (A) on hydrolysis by an alkali followed by oxidation gives (B) C₃H₄O₄, which on heating gives (C). Both (B) and (C) give effervescence with NaHCO₃. (B) on reacting with alcohol gives (D) C₇H₁₂O₄, a well known synthetic reagent.

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Hence Product (G) is

A
Cyclic amide

B
Secondary amine

C
Pyridine

D
Pyrrole

Solution
Question 7
4 / -1

A
C cannot exhibit GI

B

C

D

Solution
Question 8
4 / -1

Which of the following compound show minimum rate of hydration :

A

B

C

D
Question 9
4 / -1

Directions For Questions

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Identify the statement about final nitrogen containing compound [D].

A
It is less basic than aniline.

B
Formal charge at N is +1.

C
It will give bad smelling compound on treatment with CHCl₃/KOH.

D
On treatment with NaNO₂ + HCl followed by β–napthol in alkaline medium if will form red dye.

Solution
Question 10
4 / -1

Directions For Questions

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Find volume occupied by 28 mg of gas (Z) at 273 K, 9 atm, if its compressibility factor is 0.9.

[B = 11]

A
22.4 L

B
2.24 L

C
2.24 mL

D
224 mL

Solution