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Abdulrazak umar Usman
Questions and answers by visitors named
Abdulrazak umar Usman
Questions (125)
calculate the volume of concentrated nitric acid, if 18 moldm-³ is required to prepare 2.0 moldm-³ nitric acid
1 answer
34 views
What will be the new concentration of phosphoric acid, when 20~cm^{3} of 12M phosphoric acid is diluted to 0.5 L
1 answer
26 views
Solution A is 0.1mol/dm² HCI and solution B contains 5g of Impure NaOH in one liter. The average volume of acid
used to
1 answer
30 views
An unknown sample was acidified with dil. HCl tard, and barium chloride was added. A white precipitate, insoluble
in excess HCI)
1 answer
28 views
An unknown sample was acidified with dil. HCl tard, and barium chloride was added. A white precipitate, insoluble
in excess
1 answer
35 views
Sodium hydroxide (NaOH) solution was added drop wise to a portion of an unknown sample, formation of dirty
white precipitate
1 answer
31 views
A solution of sulphuric acid has a concentration 0.5~mol/din^{3} how many moles are present in 25cm^{3}
1 answer
17 views
Step 1 of preparing a standard solution is
1 answer
19 views
What is the molarity of Sodium hydroxide solution containing 60 g NaOH in 500 cm³?
1 answer
20 views
The number of replaceable hydrogen ion in a solution is referred to as
1 answer
16 views
pH of a solution is expressed mathematically as
1 answer
21 views
A solution which resists changes in pH is called a
1 answer
15 views
The pH of a solution is 5. What is the pOH of the solution?
1 answer
17 views
The heat of neutralization between a strong acid and a strong base is a constant. This is because;
1 answer
36 views
Weak organic acids or bases that change colour depending on pH of a solution are called
1 answer
31 views
Formation of hotspots arises during experiment to determine the heat of neutralization of strong acid and strong base due to
1 answer
34 views
Heat lost by evaporation during the determination of heat of neutralization can be reduced by
1 answer
27 views
Exothermic processes;
1 answer
18 views
if a substance dissolves in coexistence layers of two immiscible solvents at a specified temperature, the concentration of the
1 answer
39 views
The heat evolved or absorbed when a substance is dissolved in a solvent to form a solution is (A
1 answer
25 views
In an experiment
Volume cold water to determine the heat of solution of a substance, the following information was obtained. of
1 answer
37 views
Use the following information to answer question 12-15
Solution A is 0.1mol/dm² HCI and solution B contains 5g of Impure NaOH in
1 answer
29 views
Question 6. Adding water to a concentrated solution: (i) changes the concentration of the solution (ii) does not change the
1 answer
23 views
Question 7 to 8
7. To prepare 500~cm^{3} of 0.15 mol/dm³ sulphuric acid from a stock solution of 2.0~mol/dm^{3} sulphuric acid.
1 answer
36 views
question 7 and 8.
7. To prepare 500~cm^{3} of 0.15 mol/dm³ sulphuric acid from a stock solution of 2.0~mol/dm^{3} sulphuric
1 answer
30 views
7. To prepare 500~cm^{3} of 0.15 mol/dm³ sulphuric acid from a stock solution of 2.0~mol/dm^{3} sulphuric acid. The volume of
1 answer
34 views
8. The mass of NaOH required to prepare 250~cm^{3} of 0.1M NaOH is (A) 10g (B) 4g (C) 40g (D) 1g
1 answer
37 views
Question 8. The mass of NaOH required to prepare 250~cm^{3} of 0.1M NaOH is?
(A) 10g (B) 4g (C) 40g (D) 1g
1 answer
32 views
Question
35. Exothermic enthalpy changes are indicated with (A) positive AH value (B) negative AH value (C) ± AH value (D) none
1 answer
22 views
Question37 to 40.
37. The pH of pure water is neutral, the best explanation for this is (A) in pure water, the [H] and [OH]
1 answer
131 views
Question 1 to 9
1. Time can be considered of all of the followings except? Event from past, present and future b. What clocks
1 answer
31 views
10. Compute the volume change of a solid copper cube of initial volume 6.4\times10^{-5}m^{3} when subjected to a pressure of
20\t
1 answer
44 views
Question 10 to 12
10. Compute the volume change of a solid copper cube of initial volume 6.4\times10^{-5}m^{3} when subjected to
1 answer
29 views
Question 10 to 12.
10. Compute the volume change of a solid copper cube of initial volume 6.4\times10^{-5}m^{3} when subjected to
1 answer
30 views
Question 10 to 12.?
10. Compute the volume change of a solid copper cube of initial volume 6.4\times10^{-5}m^{3} when subjected
1 answer
41 views
Question 10 to 11.
10. Compute the volume change of a solid copper cube of initial volume 6.4\times10^{-5}m^{3} when subjected to
1 answer
41 views
12. The thermodynamic process carried out at constant pressure is known as
a. isothermal b. adiabatic c. isobaric d. isovolumic
1 answer
32 views
Question 13 to 14.
13.How many molecules are there 70cm^{3} of benzene? For benzene, \rho=0.88g/cm^{3} and M = 78kg/kmol.
1 answer
27 views
15. A gas does 5J of work while expanding adiabatically. What is the change in internal energy? a. 6J b. -6J c. 5/ d. -5/
1 answer
20 views
Question 1 to 8.
1.A man throws a ball vertically upward with an initial speed of 20ms^{-1}. What is the maximum height reached
1 answer
29 views
Question 9 to 16.
9. The moment of a force about a point is defined as the: (a) product of force and its distance from fulcrurn
1 answer
26 views
Question 9 to 13
9. The moment of a force about a point is defined as the: (a) product of force and its distance from fulcrurn
1 answer
30 views
Question 14 to 16.
14. The potential energy in an elastic string of force constant k which has been extended by x metres is
1 answer
27 views
Question 17 to 26.
17. A gardener pushes a wheelbarrow with a force of 100N. If the handle of the wheel barrow makes an angle
1 answer
29 views
Question 27 to 35.
27. A sheet of copper has an area of 500cm2 at what is the area at 500C? For copper, linear expansibility is
1 answer
29 views
Question 28
28. The pressure and absolute temperature of the gas sample whose volume is fixed are related with one or more of the
1 answer
40 views
Question 1.
1. ............................is an input device that utilizes a light-sensitive
1 answer
26 views
Question 2.
2. Word processing package is a type of software that can be described as an..................
1 answer
23 views
Q3.
3. Providing the user interface, controlling the computer's resources and running of programs are some functions
1 answer
23 views
Question 3.
3. Providing the user interface, controlling the computer's resources and running of programs are some functions
1 answer
23 views
Question 4.
4. ALU performs Logical operations in addition to....................
1 answer
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Question 5.
5. The general speed of microprocessor chip is measured in...............
1 answer
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Question 6.
6. .....................Is the unit responsible for converting the data received from the user into computer
1 answer
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Question 7.
7. ...................is the process of producing useful information for the user.
1 answer
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Question 8.
.................................8. are the devices that is used to print single or multiple-colored images and
1 answer
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Question 9.
9. Automation is one the characteristics of computer that makes it to take decision of its own. TRUE FALSE
1 answer
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Question 10.
10. The first-generation computer is known to have used vacuum tubes and............................
1 answer
24 views
egulation of a a) Homeostasis
nearly constant b) Hormone internal c) Enzyme environment is d) Humidity
1 answer
30 views
Question 16 to 30.
16. When organisms get rid of unwanted materials from their bodies they carryout a) urination b) Faeces c)
1 answer
32 views
Question 16 to 20.
16. When organisms get rid of unwanted materials from their bodies they carryout a) urination b) Faeces c)
1 answer
30 views
Question 21 to 28.
21. The upward movement of water and nutrients in plants is primarily driven by_a) Capillary action b) Gravity
1 answer
32 views
Question 29 to 30.
29. The following are animals that exhibit internal fertilization except a) Human b) Cow c) Dog d) Fish 30.
1 answer
40 views
Question 1 to 14.
1 ............is the wit of the computer that performs the Arithmetic, moving, and processing of information 2.
1 answer
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Question 15 to 19.
15. The task of performing operations like arithmetic and logical operations s is called........... 16........
1 answer
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Question 20 to 24.
20. A trackball is an example of the common computer a) Input devices b) Output devices c)Processing devices
1 answer
66 views
Question 21 to 24.
20. A trackball is an example of the common computer a) Input devices b) Output devices c)Processing devices
1 answer
40 views
Question 2o to 24.
20. A trackball is an example of the common computer a) Input devices b) Output devices c)Processing devices
1 answer
40 views
Question 21 to 24.
21. The name of the program that displays the on- screen elements with which a user interacts is a) Software
1 answer
40 views
Question 20 to 21
20. A trackball is an example of the common computer a) Input devices b) Output devices devices c) Processing
1 answer
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20. A trackball is an example of the common computer
a) Input devices b) Output devices devices c) Processing d) input and output
1 answer
35 views
21. The name of the program that displays the on- screen elements with which a user interacts is
a) Software System a) utility
1 answer
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21. The name of the program that displays the on- screen elements with which a user interacts is
a) Software System b) utility
1 answer
35 views
Question 22 to 24.
22. Computers that manage network resources and provide centralized storage areas are referred to as ) a
1 answer
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22. Computers that manage network resources and provide centralized storage areas are referred to as
a) workstations b) servers
1 answer
31 views
Question 23 to 24.
23. Which of the following specifies the format of the packets that are sent and received among router and end
1 answer
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Question 23
23. Which of the following specifies the format of the packets that are sent and received among router and end
1 answer
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24. TCP offers one of following services to the
processes at the application layer a) linkage delivery service b) optimization
1 answer
54 views
1. a. Copy and complete the following table of difference between FTP and TFTP
S.N. Parameter FTP TFTP Operation Authentication
1 answer
39 views
2. a.
Briefly explain the classes of language translators given at-least an example for each b. Define communication software and
1 answer
41 views
17........... is the name of the network topology in which there are bidirectional links between each possible node
1 answer
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18............. is a carrier used to interconnect computers in a network, such as coaxial cable, twisted pair and optical fibre
1 answer
32 views
19........... Is the set of defined rules that allows devices to communicate across the network.
1 answer
20 views
Question 1 to 7.
Q1.In Mendeleev's periodic table, elements are arranged in the increasing order of their (A) numbers of neutrons
1 answer
41 views
Question 1 to 6.
Q1.In Mendeleev's periodic table, elements are arranged in the increasing order of their (A) numbers of neutrons
1 answer
44 views
Question 7 to 20
Q7) All are periodic properties except (A) ionization energy (B) electronegativity ( dipole rooment (D) electron
1 answer
25 views
Question 21 to 22.
Q21) Calculate the change in internal energy of a system that absorbs 10kJ of heat and does 2kJ of work. ( A)
1 answer
25 views
Question 23 to 34.
Q23) The commonest forros of equilibrium constants are and... ....(A) k_{P} and Kc (B) Ka and Kc (C) K_{D} and
1 answer
25 views
Question 35 to 50.
Q35) For the reaction (4HBr+O_{2}=2H_{2}O+2Br_{2}), the order of the reaction with respect to [O_{2}] is 1 and
1 answer
45 views
Q35) For the reaction (4HBr+O_{2}=2H_{2}O+2Br_{2}), the order of the reaction with respect to [O_{2}] is 1 and che overall
Questi
1 answer
26 views
Question 51 to 70.
Q51) London force is also known as (A) dispersion force (B) Vander-Waals forces (C) hydrogen bonding (D)
1 answer
33 views
Question 1 to 17.
1. According to Bronsted - Lowry definition, an acid is a (a) Proton acceptor (b) proton donor (c) electron
1 answer
35 views
Question 19 to 30.
19. Pick out an electron charge-to-mass ratio ratio's value from the options. (a) 1.758820 × 1011 Ckg-1 (b)
1 answer
15 views
1a. With equations, explain (1) Oxidation and (il) Dehvaration
5. How does (1) rock type (ii) slope (iii) climate influence
1 answer
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1a. With equations, explain (¡) Oxidation and (¡¡) Dehydration
b. How does (1) rock type (ii) slope (iii) climate influence
1 answer
23 views
1a. With equations, explain (1) Oxidation and (il) Dehvaration
5. How does (1) rock type (ii) slope (iii) climate influence
1 answer
17 views
1a. With equations, explain (1) Oxidation and (il) Dehvaration
b. How does (1) rock type (ii) slope (iii) climate influence
1 answer
21 views
3a. Why do rocks formed at greater depths weather easily under surface conditions?
b. With equations, state what is leaching c.
1 answer
27 views
4a. Draw the rock cycle. State two characteristics of the three (3) main rock types
b. State three (3) characteristics of a
1 answer
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4a. Draw the rock cycle. State two characteristics of the three (3) main rock types
1 answer
23 views
Q1. Positive and negative natural numbers are called
(A) (C) Irrational numbers Q2. The sum of the first 16 terms of the sequence
1 answer
29 views
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