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ForumSponsored Competitions & Programmes: PositiveNaija Competitions2021 PositiveNaija Science QuizJuly: Chemistry

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July: Chemistry

#1 · June 5, 2021, 9:09:50 PM

Welcome to the July 2021 PositiveNaija Science Quiz!

Date: 25th July, 2021 | Time: 9:00 pm - 9:05 pm

The 15 Questions will be updated on this same post at the stated date and time with replies (answers) by participants to follow accordingly.

Thank you.

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#2 · July 25, 2021, 8:59:29 PM

A carbon atom with 6 protons, 6 electrons and 6 neutrons would have a mass number of
1. 6
2. 18
3. 12
4. 15

A substance which can act both as an antiseptic and disinfectant is
1. Enzyme
2. Analgin
3. Phenol
4. Sodium pentothal

Which is an explosive?
1. NaOH
2. Ca(OH)₂
3. Mg(OH)₂
4. KOH

What is the main component of natural gas?
1. Propane
2. Ethene
3. Methane
4. Ethane

Which of the following is not an acid?
1. H₂SO₄
2. HNO₃
3. NaOH
4. HCI

The ‘fizz’ in soft drinks is caused by?
1. Hydrogen
2. Carbon dioxide
3. Nitrogen
4. Helium

Rusting of iron is a chemical change.
1. True
2. False

Viscosity index can be defined as?
1. (L-U / L-H) x 100
2. (L+U / L-H) x 100
3. (L-H / L-U) x 100
4. (L-H / L+U) x 100

As the volume is inversely proportional to pressure, we can conclude that
1. p1V2 = p2V1
2. p2V2 = p1V1
3. p1V1 = p2V2
4. p1V1 = p2V2

Which among the following is the heaviest?
1. One mole of oxygen
2. One molecule of sulphur trioxide
3. 100 amu of uranuim
4. 44 g of carbon dioxide

Which of the following is classified as a metal?
1. Ne
2. Br
3. F
4. K

Which element has the largest atomic radius?
1. Li
2. Na
3. Rb
4. F

Which type of radiation is the least penetrating?
1. alpha
2. beta
3. gamma
4. x-ray

14) In an electrolytic cell, the electrode at which the electrons enter the solution is called the [……….]; the chemical change that occurs at this electrode is called [……….].
1. anode, oxidation
2. anode, reduction
3. cathode, oxidation
4. cathode, reduction

Which of the following is used in hospital to purify air?
1. Sodium peroxide
2. Sodium sulphate
3. Sodium nitrate
4. Cuprous oxide

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#3 · July 25, 2021, 9:01:56 PM

1.A 2.B. 3.A 4.A 5.B 6B 7B 8.C 9.C 10. C 11 D 12D 13 A 14 A 15B

#4 · July 25, 2021, 9:03:14 PM

1.a
2.d
3.c
4.c
5.c
6.b
7.a
8.c
9.c
10b
11.d
12.c
13.a
14.c
15.a

#5 · July 25, 2021, 9:03:49 PM

1. C

2. C

3. D

4. A

5. C

6. B

7. B

8. B

9. C

10. B

11. D

12. C

13. A

14. B

15. A

#6 · July 25, 2021, 9:03:54 PM

1. c
2.d
3.d
4.c
5.c
6.b
7.a
8.b
9.d
10.a
11.d
12.c
13.a
14.d
15.a

#7 · July 25, 2021, 9:03:56 PM

1.c

2.c

3.a

4.c

5.c

6.b

7.a

8.b

9.c

10.c

11.d

12.c

13.a

14.a

15.a

#8 · July 25, 2021, 9:03:56 PM

1.a
2.d
3.c
4.c
5.c
6.b
7.a
8.c
9.c
10b
11.d
12.c
13.a
14.c
15.a

#9 · July 25, 2021, 9:04:24 PM

1 C

2 C

3 D

5 C

6 B

7 A

8 B

9 C

10 C

11 B

12 D

13 A

14 D

15 D

#10 · July 25, 2021, 9:04:36 PM

1) C

2) c

3 A

4) C 5) c 6.b 7. A 8. C 9.c 10.c 11.d.12 d 13 a 14. A 15 a

#11 · July 25, 2021, 9:04:53 PM

1. C
2. B
3. C
4. C
5. C
6. B
7. A
8. B
9. C
10. B
11. A
12. C
13. A
14. B
15. A

Jeremiah

#12 · July 25, 2021, 9:05:12 PM

1. C
2. B
3. C
4. C
5. C
6. B
7. A
8. B
9. C
10. B
11. A
12. C
13. A
14. B
15. A

Jeremiah

#13 · July 25, 2021, 9:05:40 PM

1 A

2 D

3 a

4 B

5 C

6 B

7 A

8 C

9 D

10 A

11 A

12 B

13 C

14 A

15 a

#14 · July 25, 2021, 9:05:42 PM

1. C
2. C
3.
4. C
5. C
6. B
7. A
8. C
9. C and D
10. A
11. D
12. C
13. A
14. D
15. B

dejt4u - Ayodeji Olowolagba

#15 · July 25, 2021, 9:05:51 PM

1. C
2. B
3. C
4. C
5. C
6. B
7. A
8. B
9. C
10. B
11. A
12. C
13. A
14. B
15. A

Jeremiah

#16 · July 25, 2021, 9:06:18 PM

1.c

2. C

3. D

4. A

5. C

6. B

7. A

8. D

9. A

10. C

11. D

12. C

13. A

14. D

15. A

#17 · July 25, 2021, 9:06:18 PM

1. C
2. B
3. C
4. C
5. C
6. B
7. A
8. B
9. C
10. B
11. A
12. C
13. A
14. B
15. A

Jeremiah

#18 · July 25, 2021, 9:06:19 PM

3 c

9.c

10c

11d

12c

13a

14a

15d

#19 · July 25, 2021, 9:06:38 PM

1a2b3c4d5a6d7c8a9d10c11d12a13b14d15a

#20 · July 25, 2021, 9:07:21 PM

1.c

2.c

3.a

4.c

5.c

6.b

7.a

8.b

9.c

10.c

11.d

12.c

13.a

14.a

15.a