Chemistry Test 153

Result

Chemistry Test 153

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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following orders is not in accordance with the property stated aginst is?

A
HI > HBr > HCl > HF: acidic property in water

B
F2 > Cl2 > Br2 > I2: electronegativity

C
F2 > Cl2 > Br2 > I2: Bond dissociation energy

D
F2 > Cl2 > Br2 > I2: Oxidising power

Solution

Bond dissociation energy of fluorine is less because of its small size and repulsion between electrons of two atoms. So option (c) is wrong order. The correct order is [Cl2 > Br2 > F2 > I2]
Question 2
4 / -1

Select the true statement about benzene amongst the following

A
Because of unsaturation benzene easily undergoes addition

B
There are two types of C-C bonds in benzene

C
There is cyclic delocalisation of pi-electrons in benzene

D
Monosubstitution of benzene gives three isomeric products

Solution

Benzene do not show addition reaction like other unsaturated hydrocarbons. However, it shows substitution reaction. Due to resonance all the C-C bonds have the same nature, which is possible because of the cyclic delocalisation of pi electrons in benzene. Monosubstitution will give only a single product.
Question 3
4 / -1

The depression in freezing point for 1 M urea, 1 M glucose and 1 M NaCl are in ratio:

A
1:2:3

B
3:2:2

C
1:1:2

D
2:3:1

Solution
Question 4
4 / -1

Which will make basic buffer?

A
50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH3COOH

B
100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NaOH

C
100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH

D
100 mL of 0.1 M HCl + 100 mL of 0.1 M of NaOH
Question 5
4 / -1

A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?

A
Thiosulphato

B
Oxalato

C
Glycinato

D
Ethane-1,2-diamine

Solution

The chelating ligand is a ligand that has two donor atoms to bind a single metal ion. Glycinato has 2 oxygen atoms as donor atoms. It is a chelating ligand. Oxalato has 2 oxygen atoms as donor atoms. It is a chelating ligand. Thiosulphato (S2O3^2−) is an ambidentate ligand. not a chelating ligand.
Question 6
4 / -1

A gas occupies a volume of 300 cc at 27°C and 620 mm pressure. The volume of gas at 47°C and 640 mm pressure is:

A
260 cc

B
310 cc

C
390 cc

D
450 cc

Solution
Question 7
4 / -1

A

B

C

D

Solution
Question 8
4 / -1

Which of the following has the maximum number of unpaired electrons?

A

B

C

D

Solution
Question 9
4 / -1

A
+1

B
–1

C
–0.75

D
+0.75

Solution
Question 10
4 / -1

A

B

C

D

Solution