Chemistry Test 105

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Chemistry Test 105

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Weekly Quiz Competition

Question 1
4 / -1

The compound Na₂IrCl₆ reacts with triphenylphosphine in diethyleneglycol in an atmosphere of CO to give [IrCl(CO)(PPh₃)₂], known as 'Vaska's compound'. (Atomic number of Ir = 77) Which of the following statements is correct?

A
The IUPAC name of the complex is carbonylchlorideobis (triphenylphosphine) iridium(III)

B
The hybridisation of the metal ion is sp³

C
The magnetic moment (spin only) of the complex is zero

D
The complex shows geometrical as well as ionization isomerism

Solution

(A)   [1rCl(CO)(PPh₃)₂] carbonylchloridobis (triphenylphosphine) iridium(I).

(B)   Coordination number of Ir is four. Ir is in (+1) oxidation state with 4d⁸ configuration. It is trans isomer, so its geometry should be square planar.

(C)   All electrons are paired, hence diamagnetic

(D)   Can exhibit GI only.
Question 2
4 / -1

The cell shown below generates a potential of 0.643 V at 300 K. Find (log K_sp) for AgBr:

Ag|AgBr(s)|NaBr(0.1 M)||AgNO₃(0.1 M)|Ag

A
–30.2

B
–15.6

C
–12.71

D
–8.9

Solution
Question 3
4 / -1

Incorrectly matched reaction among the following is :

A
(1)

B
(2)

C
(3)

D
(4)

Solution

Ferdal Craft reaction not shown by Highly Activated Rings.
Question 4
4 / -1

Choose the incorrect statement from the following:

A
The slag obtained during extraction of iron is heavy and has lower melting point than that of metal.

B
At temperature below 983 K(approx) CO is chief reducing agent in blast furnance.

C
In zone refining impurities moves in the direction of heater.

D
Electrolytic reduction of Al₂O₃ is known as Hall-Heroult process.

Solution

The slag formed is CaSIO₃ which is lighter and has less melting point.
Question 5
4 / -1

We have taken a saturated solution of AgBr. K_sp of AgBr is 12 × 10^–14. If 10^–7 mole of AgNO₃ are added to 1 litre of this solution find conductivity (specific conductance) of this solution in terms of 10^–7 S m^–1 units.

A
55

B
75

C
65

D
45

Solution

S + 10^–7 S

(S + 10^–7)S = 12 × 10^–14

∴ S = 3 × 10^–7 M

[Ag⁺] = 4 × 10^–7 M

[Br^–] = 3 × 10^–7 M

[NO₃^–] = 10^–7 M

κ_totel= [6 × 4 × 10^–7] + [8 × 3 × 10^–7] + [7 × 1 × 10^–7]

= 55 × 10^–7 S m^–1
Question 6
4 / -1

Incorrect order of Rate of Reduction among the following is :

A
-Reduction with Borane

B
- Reduction with LiAlH₄

C
Reduction with H₂/Ni

D

Solution

DiBAL-H is electron deficient reducing agent as Burane and readily reduces electron rich sp.
Question 7
4 / -1

Which of the following cation produces ppt. with only one of the given condition

(I) In aqueous solution produce ppt with dil. HCl

(II) In acidic aqueous solution produce ppt with H₂S

A
Pb⁺²

B
Hg₂²⁺

C
Ag⁺

D
Sn⁺²

Solution

A, B and C can be precipitated by HCl as well as H₂S as their insoluble chlorides and sulphides.

(D) Sn⁺² can be precipitated by H₂S but not by HCl

Sn⁺²+ 2HCl → SnCl₂(soluble)
Question 8
4 / -1

Select the incorrect statement.

A
Three moles of phenylhydrazine and one mole of aldose required to produce phenylosazone

B
Glucose form gluconic acid with Br₂/HOH

C
Glucose form Glucaric acid with HNO₃

D
Lowering in carbon chain can be done by Kiliani Fischer method.

Solution

Kiliani Fischer method is for upgradation of C-chain.
Question 9
4 / -1

Select the INCORRECT statement:

A
At Boyle's temperature a real gas behaves like an ideal gas irrespective of pressure.

B
At Boyle's temperature ;

C
On increasing the temperature four times, collision frequency (Z₁) becomes double at constant volume.

D
At high pressure Van der Waals constant 'b' dominates over 'a'.

Solution

At Boyle's Temperature; gas behaves ideally for a range of pressure.
Question 10
4 / -1

Directions For Questions

...view full instructions

How many statements are correct?

(i) P₁ is H₂N – CO(–CH₂)₃ – CH₂CO₂H

(ii) P₂ is H₂N – (CH₂)₃ – CH₂CO₂H

(iii) P₃ is H₂N – (CH₂)₃ – CH(Br) – CO₂H

(iv) P₄ is

A
1

B
2

C
3

D
4

Solution

All are correct