Chemistry Test 121

Result

Chemistry Test 121

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Weekly Quiz Competition

Question 1
4 / -1

If two Cl^– ion are removed from any corners of a perfect CsCl crystal (Cs⁺ at cubic void), then its packing fraction will become :

A

B

C

D

Solution
Question 2
4 / -1

An alloy of metal 'A', 'B' and 'C' is found to have 'A' constituting ccp lattice. If 'B' atom occupy the edge centres and 'C' is present at the body centre, the formula of the alloy is :-

A
A₄B₂C

B
A₄B₄C

C
A₄B₃C

D
ABC

Solution
Question 3
4 / -1

The rate constant for two parallel reactions were found to be 1.0 × 10^–2 s^–1 and 3.0 × 10^–2 s^–1. If the corresponding energies of activation of the parallel reactions are 60.0 kJ mol^–1 and 70.0 kJ mol^–1 respectively, what is the apparent overall energy of activation ?

A
130.0 kJ mol^–1

B
65.0 kJ mol^–1

C
100.0 kJ mol^–1

D
67.5 kJ mol^–1

Solution
Question 4
4 / -1

For the first order reaction, A → product (t_1/2 = 10 minutes), the fraction of reactant degraded after an hour from the reaction has started is :

A
1/64

B
1/32

C
63/64

D
31/32

Solution
Question 5
4 / -1

Which of the following has maximum boiling point ?

A
CH₃OCH₃

B
CH₃—CH₃

C
CH₃CH₂OH

D
CH₄

Solution

CH₃CH₂OH shows H–bonding.
Question 6
4 / -1

Which of the following statements is not correct ?

A
Nitrogen forms triple bonds whereas phosphorus does not exist as P ≡ P.

B
The N–N bond is stronger than P–P bond

C
Red phosphorus is less reactive than white phosphorus

D
Sulphur exhibits catenation.

Solution

(1) is not correct because it is a correct statement. Nitrogen forms multiple bonds because two N atoms can come sufficiently close together while P atom being large in size cannot come close together and hence does not form
P ≡ P.

(2) is correct because it is an incorrect statement as the P–P single bond is more stronger than N–N because in N–N, there is more repulsive force between the non–bonding electron pair.

(3) is not correct it is a correct statement as in white phosphorus, the structure is highly strained

whereas in red phosphorus, the structure is less stained

(4) is not correct because it is a correct statement as S—S single bond is a strong bond.
Question 7
4 / -1

Given reaction A₂ + B₂ → 2AB follows the mechanism as given below :

which is/are correct statements -

A

B

C

D
option 2 and option 3 are correct

Solution
Question 8
4 / -1

Select the correct statement.

A
During heating ZnO lattice it's density will increase.

B
On heating ferromagnetic substance convert in paramagnetic substance.

C
CaF₂ represent anion frenkel defect.

D
All are correct
Question 9
4 / -1

In an experiment vapours of compound (X) are placed between pair of metal plates in the absence of applied field in figure(I) and in the presence of applied electrical field when an electrical potential is applied across the plates in figure-2. Depends on compound(X) identify correct statement(s).

A
If X is NH₃ , N end of molecule is point towards +ve plate

B
If X is BF₃, No such alignment of molecules is observe

C
Extent of alignment is higher when (X) is NH₃ as compared to when (X) is NF₃

D
All are correct
Question 10
4 / -1

Which of the following chemical specie(s) does/do not exist.

A
NCl₅

B
OF₄

C
NF₅

D
All are correct