JEE CHEMISTRY

DAILY CHEMISTRY TEST QUESTIONS

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1 Stoichiometry

In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid conditionin the end?

1) 20 litres ammonia, 20 litres nitrogen, 20 litres hydrogen
2) 10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
3) 20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen
4) 20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

Option 1

Option 2 Solution:

Solution

Reaction N₂ + 3H₂ → 2NH₃
Hydrogen is 30 L thus requires 10 Nitrogen
Hydrogen is limiting reagent
Now only 50% of Hydrogen is used = 15 and Balance hydrogen =15L
Therefore 5 L of Nitrogen used and 30-5 = 25 Balanced
NH₃ Produced = 10 L

Option 3

Option 4

2 Atomic Structure

An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of

1. 5
2. 6
3. 8
4. 11

Option 1 Solution:

The number of protons is the same as the atomic number. There are 5 protons so the atomic number is also 5.

Option 2

Option 3

Option 4

3 States of Matter

At a temperature T K, the pressure of 4 g argon in a bulb is P. The bulb is put in a bath having a temperature higher by 50 K than the first one. 0.8 g of argon gas had to be removed to maintain original pressure. The temperature T is equal to

1) 510 K
2) 200 K
3) 100 K
4) 73 K

Option 1

Option 2 Solution:

Solution

The temperature is changed from T to $$T + 50$$ K.
Mass (W) is changed from 4 g to $$ (4-0.8) = 3.2$$ g

$$\displaystyle WT=W'T'$$
$$\displaystyle 4 \: g \times T \: K= 3.2 \: g \times (T+50) \: K$$
$$\displaystyle 4 T = 3.2 T+160 $$
$$\displaystyle 0.8 T = 160$$
$$\displaystyle T = 200$$ K

Option 3

Option 4

4 States of Matter

50 mL of each gas A and of gas B takes 200 and 150 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

1) 96
2) 128
3) 32
4) 64

Option 1

Option 2

Option 3

Option 4 Solution:

Solution :

From Graham’s law of effusion

5 Alcohols Phenols and Ethers

The ionization constant of phenol is more than that of ethanol because:

1) phenoxide ion is a stronger base than ethoxide ion
2) phenoxide ion is stabilized by resonance
3) ethoxide ion is stabilized by resonance
4)�phenoxide ion is aromatic while ethoxide ion is aliphatic

Option 1

Option 2 Solution:

Solution

The ionization constant of phenol is more than that of ethanol because phenoxide ion is stabilized by resonance.
Note: Ionization constant(Ka) of phenol is more than that of ethanol indicates phenol is move acidic than alcohol. Phenol on ionization gives phenoxide ion it is stabilized by resonance

Option 3

Option 4

When Reactivity of Halogen atom is minimum in
1. propyl oxide
2. propyl chloride
3. isopropyl chloride
4. isopropyl bromide

Option 1

Option 2 Solution:

Option 3

Option 4

7 Aldehydes Ketones and Carboxylic Acids

Only an aldehyde having ____can undergo the aldol condensation.
�1) at least one alpha H atom.
�2) at least one beta H atom.
�3) no alpha H atom.
�4) an aromatic ring

Option 1 Solution:

Option 2

Option 3

Option 4

8 S � Block Elements

What is the correct order of increasing solubility of the following salt?

$$NaHCO_3, KHCO_3, Mg(HCO_3)_2, Ca(HCO_3)_2$$

1) $$KHCO_3<Mg(HCO_3)_2<Ca(HCO_3)_2<NaHCO_3$$
2) $$Mg(HCO_3)_2<Ca(HCO_3)_2<NaHCO_3<KHCO_3$$
3) $$NaHCO_3<KHCO_3<Mg(HCO_3)_2<Ca(HCO_3)_2$$>
4) $$Ca(HCO_3)_2<NaHCO_3<KHCO_3<Mg(HCO_3)_2$$

Option 1

Option 2

Option 3 Solution:

Solution

In the give metal bicarbonates, the anion (bicarbonate ion) is same. Hence the solubility will depend on the size of anion. The size of $$Na^+$$ ion is smaller than that of $$K^+$$ ion. Hence sodium bicarbonate has high lattice energy and lower solubility than potassium bicarbonate. Similarly, the size of $$Mg^+$$ ion is smaller than that of $$Ca^+$$ ion. Hence magnesium bicarbonate has high lattice energy and lower solubility than calcium bicarbonate.

Option 4

9 Chemistry in Everyday Life

Which set has different class of compounds?

1) Tranquillisers-equanil, heroin, valium
2) Antiseptics-bithional, dettol, boric acid
3) Analgesics-naproxen, morphine, aspirin
4) Bactericidal-penicillin, aminoglycosides, ofloxacin

Option 1 Solution:

SOLUTIONS

Heroin is prescribed as an analgesic, cough suppressant and as an antidiarrhoeal. It is not a tranquilliser

Option 2

Option 3

Option 4

10 Atomic Structure

If atoms of elements have completely filled outermost shell then their combining capacity or valency is :
1) one
2) two
3) zero
4) five

Option 1

Option 2

Option 3 Solution:

Solution

If atoms of elements, have a completely filled outermost shell then their combining capacity or valency is zero.

Option 4

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