Chemistry Test 65

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Chemistry Test 65

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Weekly Quiz Competition

Question 1
4 / -1

The time for half-life period of a certain reaction A→ products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0molL−12.0mol L⁻¹, how much time does it take for its concentration to come from 0.50 to 0.25mol L⁻¹ if it is a zero order reaction?

A
4 h

B
0.5 h

C
0.25 h

D
1 h
Question 2
4 / -1

NaNO₃ on being heated to 500^∘C gives

A
NaNO₂only

B
Na₂O + N₂

C
NaNO₂+ O₂

D
NaNO₂+ O2 + N₂
Question 3
4 / -1

The structure of diborane (B₂H₆) contains

A
Four 2c-2e bonds and two 3c-2e bonds

B
Two 2c-2e bonds and four 3c-2e bonds

C
Two 2c-2e bonds and two 3c-3e bonds

D
Four 2c-2e bonds and four 3c-2e bonds
Question 4
4 / -1

If 10⁻⁴dm³of water is introduced into a 1.0 dm³flask to 300 K, how many moles of water are in the vapour phase when equilibrium is established?

(Given : Vapour pressure of H₂O at 300 K is 3170 Pa ; R=8.314JK ^-1mol⁻¹

A
5.56 × 10⁻³mol

B
1.53 × 10⁻²mol

C
4.46 × 10⁻²mol

D
1.27 × 10⁻³mol
Question 5
4 / -1

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is

A
propene

B
1-butene

C
2-butene

D
ethene
Question 6
4 / -1

If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ΔTf), when 0.01mol of sodium sulphate is dissolved in 1 kg of water, is (K_f= 1.86 K kgmol⁻¹)

A
0.0372 K

B
0.0558 K

C
0.0744 K

D
0.0186 K
Question 7
4 / -1

From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl_2,is

A
2-Butanol

B
2-Methylpropan-2-ol

C
2-Methylpropanol

D
1-Butanol
Question 8
4 / -1

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

A
59.0

B
47.4

C
23.7

D
29.5

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Chemistry Test 65

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Chemistry Test 65

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Question 1

4 h

0.5 h

0.25 h

1 h

Question 2

NaNO2 only

Na2O + N2

NaNO2 + O2

NaNO2 + O2 + N2

Question 3

Four 2c-2e bonds and two 3c-2e bonds

Two 2c-2e bonds and four 3c-2e bonds

Two 2c-2e bonds and two 3c-3e bonds

Four 2c-2e bonds and four 3c-2e bonds

Question 4

5.56 × 10−3mol

1.53 × 10−2 mol

4.46 × 10−2 mol

1.27 × 10−3 mol

Question 5

propene

1-butene

2-butene

ethene

Question 6

0.0372 K

0.0558 K

0.0744 K

0.0186 K

Question 7

2-Butanol

2-Methylpropan-2-ol

2-Methylpropanol

1-Butanol

Question 8

59.0

47.4

23.7

29.5

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NaNO₂only

Na₂O + N₂

NaNO₂+ O₂

NaNO₂+ O2 + N₂

5.56 × 10⁻³mol

1.53 × 10⁻²mol

4.46 × 10⁻²mol

1.27 × 10⁻³mol