NSEC CHEMISTRY

DAILY CHEMISTRY TEST QUESTIONS

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1 Electrochemistry

In electro-refining of copper some gold is deposited as :

1) Electrolyte
2) Cathode
3) Cathode mud
4) Anode mud

Option 1

Option 2

Option 3

Option 4 Solution:

2 Purification and Characterisation of Organic Compounds

In the experiment for determining the percentage of water absorbed by raisins, we do the final weighing of the raisins after keeping them dipped in water for about one hour. For the accuracy of the result, the extra water from the surface of the soaked raisins is removed by :

1) rubbing with cotton cloth

2) hot air blower

3) dry cotton wool

4) filter paper

Option 1

Option 2

Option 3

Option 4 Solution:

SOLUTION

Before weighing the soaked raisins, these should be dried gently with the help of filter paper to remove excess of water.

3 S � Block Elements

30 g of Magnesium and 30 g of oxygen are reacted, then the residual mixture contains:

1) 50 g of Magnesium oxide and 10 g of oxygen
2) 40 g of Magnesium oxide and 20 g of oxygen
3) 45 g of Magnesium oxide and 15 g of oxygen
4) 50 g of Magnesium only

Option 1 Solution:

Solution

2Mg + O₂→ 2MgO₂

According to the above reaction,

28.6g(2mole) Mg Mg combine with 32g(1mole) of O₂ to give 80.6g(2mole) of MgO.

thus,

30g Mg will combine with 20g of O₂ to produce 50g MgO and 10g O₂ will remain unreactive.

Option 2

Option 3

Option 4

4 P � Block Elements

Ammonia gas dissolves in water to form NH₄OH. In this reaction water acts as :

1) A conjugate base
2) A non-polar solvent
3) An acid
4) A base.

Option 1

Option 2

Option 3 Solution:

Solution

NH_3?+H_2?O → NH₄+? +OH⁻

Water acts as a proton donor in this reaction. Since, a proton donor is an acid, water acts a Bronsted-Lowry acid.

Option 4

5 Titrations

0.56 g of limestone was treated with oxalic acid to give CaC_2?O₄?. The precipitate decolorised 45 mL of 0.2 N KMnO₄? in acid solution. Calculate the % of CaO in limestone.

1) 15

2) 20

3) 34

4) 45

Option 1

Option 2

Option 3

Option 4 Solution:

Solution

45 mL of 0.2 N KMnO₄?=45 mL of 0.2 N CaC₂?O₄?
=45 mL of 0.2 N CaCO_3?
=45 mL of 0.2 N CaO

Mass of CaO= (N×E×V)/1000 =0.252 g

% of CaO in limestone = 0.252 x 100 / 0.56 =45

6 Atomic Structure

What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?

1. 28
2. 56
3. 62
4. 90

Option 1

Option 2

Option 3 Solution:

Atomic mass is found by adding protons plus neutrons. 28 + 34 = 62. Electrons have a mass of nearly 0 so they are not counted in the formula for atomic mass.

Option 4

7 Basic Principles of Organic Chemistry

The IUPAC name of

1) 5−Oxo−4−hydroxy−2−pentanone
2) 4−Hydroxy−5−al−2−Pentanone
3) 2−Hydroxy−4−Oxopentanal
4) 1−Al−4−Oxo−2−Pentanol

Option 1

Option 2

Option 3 Solution:

SOLUTION

Aldhyde behaves as a functional group and numbering starts from terminal functional group.

2−Hydroxy−4−Oxopentanal

Option 4

8 S � Block Elements

Alkaline earth metals burn in nitrogen and form nitrides of type M₃N₂. which of them is volatile in nature?

1) Mg₃N₂
2) Ba₃N₂
3) Ca₃N₂
4) Be₃N₂

Option 1

Option 2 Solution:

Solution

Be is smallest and least electropositive element among alkaline earth metal. Be when reacts with N form weak bond hence Be₃N₂ is volatile while other metals form a strong bond and are not volatile, they are solid.

Option 3

Option 4

9 D and F Block Elements

Aqueous solution of a metallic nitrate X reacts with NH₄OH to form Y which dissolves in excess NH₄OH. The resulting complex is reduced by acetaldehyde to deposit the metal. X and Y, respectively, are:

1) Cs(NO₃) and CsOH
2) Zn(NO₃)₂ and ZnO
3) AgNO₃ and Ag₂O
4) Mg(NO₃) and Mg(OH)₂

Option 1

Option 2

Option 3 Solution:

Solution

$$AgNO_3+NH_4OH\rightarrow NH_4NO_3+AgOH$$

$$2AgOH\rightarrow Ag_2O+H_2O$$

$$Ag_2O+2NH_4OH\rightarrow \underset{(Soluble)}{2[Ag(NH_3)_2]OH}+3H_2O$$

$$\overset{\overset{CH_2OH}{|}}{\underset{Glucos}{\underset{CHO}{\underset{|}{(CHOH_4)}}}}+Ag_2O \xrightarrow[]{NH_4OH}$$$$\overset{\overset{COOH}{|}}{\underset{Glucos}{\underset{COOH}{\underset{|}{(CHOH_4)}}}}+\underset{(silver\,mirror}{2Ag)}$$

Option 4

10 Basic Principles of Organic Chemistry

Total number of isomers of C₄H₁₀O will be

1) 4
2) 5
3) 6
4) 7

Option 1

Option 2

Option 3

Option 4 Solution:

SOLUTION

C₄H₁₀O satisfies the general formula C_nH_2n+2O

It is either a monohydric alcohol or an ether.

Four structural isomers of alcohol and three structural isomers of ethers are possible. They are:

1. butan-1-ol
2. butan-2-ol
3. 2-methyl-propan-1-ol
4. 2,2dimethyl-propan-2-ol
5. diethyl ether
6. methyl 1-propyl ether
7. methyl 2-propyl ether

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