NEET CHEMISTRY

DAILY CHEMISTRY TEST QUESTIONS

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1 S � Block Elements

A substance X is a compound of an element of group IA. The substance X gives a violet colour in flame test. X is

1) NaCl

2) KCl

3) LiCl

4) None

Option 1

Option 2 Solution:

Solution

Since potassium gives violet colour on the flame test, the substance X is KCl.

Option 3

Option 4

2 Coordination Compounds

Among the following, which are ambidentate ligands?
(i) SCN⁻
(ii) $$NO^-_3$$
(iii) $$NO^-_2$$
(iv) $$C_2O^{2-}_4$$

1) (i) and (iii)
2) (i) and (iv)
3) (ii) and (iii)
4) (ii) and (iv)

Option 1 Solution:

Solution

Ambidentate ligand has two or more donor atoms, but during complex formation, only one donor atom is attached to central metal. SCN− ion has donor atoms N and S. It links to metal as either M−SCN or M−NCS. NO₂⁻ group has donor atoms N and O. It links to metal as either M−ONO or M−NO2.

Option 2

Option 3

Option 4

3 Mole Concept

$$3BaCl_{2}+2Na_{2}PO_{4}\rightarrow Ba_{3}(PO_{4})_{2}+6NaCl$$
Maximum amount of $$Ba_{3}(PO_{4})_{2}$$ formed when $$2$$ moles each of $$Na_{3}PO_{4}$$ and $$BaCl_{2}$$ react is:

1) 4 mol
2) 1 mol
3) 2 /3 mol
4) 5/3 mol

Option 1

Option 2

Option 3

Option 4 Solution:

Solution

$$3BaCl_2+2Na_3PO_4\longrightarrow Ba_3(PO_4)_2+6NaCl$$

$$3$$ $$moles$$ of $$BaCl_2$$ gives $$1$$ $$mole$$ of $$Ba_3(PO_4)_2$$

$$\therefore$$ $$2$$ $$moles$$ of $$BaCl$$ give $$\cfrac{2}{3}$$ $$moles$$ of $$Ba_3(PO_4)_2$$

$$2$$ $$mole$$ of $$Na_3PO_4$$ gives $$1$$ $$mole$$ of $$Ba_3(PO_4)_2$$

$$\therefore$$ $$2$$ $$moles$$ of $$Na_3PO_4\longrightarrow$$ $$1$$ $$mole$$ of $$Ba_3(PO_4)_2$$

Total moles of $$Ba_3(PO_4)_3=1+\cfrac{2}{3}=\cfrac{5}{3}$$ $$moles$$

4 Chemical Equilibrium

Starting with 100 mm (Hg) pressure of SO₂Cl₂ in a closed container, the following equilibrium is set up at some temperature:
SO₂Cl_2(g) ? SO_2(g) + Cl_2(g). If mole fraction of SO₂Cl₂ at equilibrium is 1/3, K_p for the reaction is:

1) 60 mm
2) 50 mm
3) 120 mm
4) 25 mm

Option 1

Option 2 Solution:

SOLUTION

SO₂Cl_2(g) ? SO_2(s) + Cl_2(g)

Total pressure = 100 - x + x = 100 + x mm

given, $$\cfrac{100-x}{100+x}\,=\,\cfrac{1}{3}$$ , x = 50 mm

K_p = $$\cfrac{{{P}_{S{{O}_{2}}}}\times {{P}_{C{{l}_{2}}}}}{{{P}_{S{{O}_{2}}C{{l}_{2}}}}}\,=\,\cfrac{x\times x}{\left( 100-x \right)}$$

= 50 mm

Option 3

Option 4

5 Coordination Compounds

Among the following, which are ambidentate ligands?
(i) SCN⁻
(ii) $$NO^-_3$$
(iii) $$NO^-_2$$
(iv) $$C_2O^{2-}_4$$

1) (i) and (iii)
2) (i) and (iv)
3) (ii) and (iii)
4) (ii) and (iv)

Option 1 Solution:

Solution

Option 2

Option 3

Option 4

6 Solid State

CsBr crystallizes in a body-centred cubic lattice of unit cell edge length 436.6 pm. Atomic masses of Cs and Br are 133 amu and 80 amu respectively. The density (in g cm⁻³) of CsBr is

1) 8.50
2) 4.25
3) 42.5
4) 0.425

Option 1 Solution:

Solution

The formula for density is given below:
$$\displaystyle \text{Density}=\frac{n\times M}{a^3\times N_0}\displaystyle=\frac{2\times213}{(4.366\times10^{-8})^3\times6.02\times10^{23}}$$ $$=8.50$$ g cm$$^{-3}$$

Option 2

Option 3

Option 4

7 Haloalkanes and Haloarenes

Liebermann's test is answered by :

1) methylamine
2) aniline
3) phenol
4) ethyl benzoate

Option 1

Option 2

Option 3 Solution:

When phenol is reacted with NaNO₂ and concentrated H₂SO₄,
it provides a deep green or blue colour which changes to red on dilution with water.
Generated substance in presence of NaOH / KOH restores original green or blue colour.
This reaction is termed as Liebermann's nitroso reaction

Option 4

8 Redox Reactions

Among the following, identify the species with an atom in +6 oxidation state.

1) [MnO₄]⁻
2) [Cr(CN)₆]³⁻
3) Cr₂O₃
4) CrO₂Cl₂

Option 1

Option 2

Option 3

Option 4 Solution:

SOLUTION

CrO₂Cl₂

Cr+2(O)+2(Cl)=0

Cr+2(−2)+2(1)=0

Cr=+6

9 Surface Chemistry

A catalyst:
(i) increases the average kinetic energy of reacting molecules
(ii) decrease the activation energy
(iii) alters the reaction mechanism
(iv) increases the frequency of collisions of reacting species.
The true statements are:

1) i, ii, iii
2) ii, iv
3) ii, iii
4) all are correct

Option 1

Option 2

Option 3 Solution:

Solution

A catalyst is a substance which when added to a reaction, finds an alternative route (hence, altering the reaction mechanism) with lower activation energy as shown in the diagram. Remember that with a catalyst, the average kinetic energy of the molecules remains the same but the required energy decreases.

Option 4

10 Coordination Compounds

Select the correct order of C-O bond order in mixed phosphine carbonyl complex :

1) $$[(Ph_3P)_3Mo(CO)_3] > [(Ph_2PCl)_3Mo(CO)_3] < (PhPCl_2)_3 Mo (CO)_3]$$
2) $$[(Ph_3P)_3Mo(CO)_3] > [(Ph_2PCl)_3Mo(CO)_3] > (PhPCl_2)_3 Mo (CO)_3]$$
3) $$[(Ph_3P)_3Mo(CO)_3] = [(Ph_2PCl)_3Mo(CO)_3] > (PhPCl_2)_3 Mo (CO)_3]$$
4) $$[(Ph_3P)_3Mo(CO)_3] < [(Ph_2PCl)_3Mo(CO)_3] > (PhPCl_2)_3 Mo (CO)_3]$$

Option 1

Option 2 Solution:

Solution

As phenyl group increases, resonance increases and bond length increases so order is
$$[(Ph_3P)_3Mo(CO)_3] > [(Ph_2PCl)_3Mo(CO)_3] < (PhPCl_2)_3 Mo (CO)_3]$$

Option 3

Option 4

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