Abdulrazak umar Usman

calculate the volume of concentrated nitric acid, if 18 moldm-³ is required to prepare 2.0 moldm-³ nitric acid

1 year ago

What will be the new concentration of phosphoric acid, when 20~cm^{3} of 12M phosphoric acid is diluted to 0.5 L

1 year ago

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 neutralize 25cm^{3} the base was determined to be 20.50~cm^{3}

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An unknown sample was acidified with dil. HCl tard, and barium chloride was added. A white precipitate, insoluble in excess HCI) indicates the presence of

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Sodium hydroxide (NaOH) solution was added drop wise to a portion of an unknown sample, formation of dirty white precipitate insoluble in excess NaOH Indicates the presence of

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A solution of sulphuric acid has a concentration 0.5~mol/din^{3} how many moles are present in 25cm^{3}

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Step 1 of preparing a standard solution is

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What is the molarity of Sodium hydroxide solution containing 60 g NaOH in 500 cm³?

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The number of replaceable hydrogen ion in a solution is referred to as

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pH of a solution is expressed mathematically as

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A solution which resists changes in pH is called a

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The pH of a solution is 5. What is the pOH of the solution?

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The heat of neutralization between a strong acid and a strong base is a constant. This is because;

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Weak organic acids or bases that change colour depending on pH of a solution are called

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Formation of hotspots arises during experiment to determine the heat of neutralization of strong acid and strong base due to

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Heat lost by evaporation during the determination of heat of neutralization can be reduced by

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Exothermic processes;

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if a substance dissolves in coexistence layers of two immiscible solvents at a specified temperature, the concentration of the substance in the solvents bears a constant ratio to one another. This is a statement of the

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The heat evolved or absorbed when a substance is dissolved in a solvent to form a solution is (A

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In an experiment Volume cold water to determine the heat of solution of a substance, the following information was obtained. of Volume of Temperature Temperature of hot water Specific heat of Temperature of water hot water of cold water capacity water mix...

1 year ago

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 one liter. The average volume of acid used to neutralize 25cm^{3} the base was determined to be 20.50~cm^{3} 12. The concentra...

1 year ago

Question 6. Adding water to a concentrated solution: (i) changes the concentration of the solution (ii) does not change the number of moles of solute present (iii) does not change the molarity of the solution (A) i and ii (B) i and iii (C) a and iii (D) I...

1 year ago

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. The volume of stock solution required is (A)37~cm^{3}(B) (B)37.5~cm^{3}(C)27.8~cm^{3}(D) 25.4~cm^{3} 8. The mass of NaOH requir...

1 year ago

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 stock solution required is (A)37~cm^{3} (B)37.5~cm^{3}(C)27.8~cm^{3}(D) 25.4~cm^{3}

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8. The mass of NaOH required to prepare 250~cm^{3} of 0.1M NaOH is (A) 10g (B) 4g (C) 40g (D) 1g

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Question 35. Exothermic enthalpy changes are indicated with (A) positive AH value (B) negative AH value (C) ± AH value (D) none of these

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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] concentration are the same (8) the pH of pure water is 7 (C) pure water will never ionize (D) water do not contain free H 38. A pH...

1 year ago

Question 1 to 9 1. Time can be considered of all of the followings except? Event from past, present and future b. What clocks measure c. What keeps everything happening at ones d. It is a derived physical quantity 2. Which of the followings best described...

1 year ago

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\times10^{6}Pa. The bulk modulus is 125000\times10^{6}Pa. a. 1.024\times10^{-t}m^{3} b. -102\times10^{-1}m^{3} c. -1.024\times10...

1 year ago

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 a pressure of 20\times10^{6}Pa. The bulk modulus is 125000\times10^{6}Pa. a. 1.024\times10^{-t}m^{3} b. -102\times10^{-1}m^{3}...

1 year ago

12. The thermodynamic process carried out at constant pressure is known as a. isothermal b. adiabatic c. isobaric d. isovolumic

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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. 4.7\times10^{-26} . 3.0\times10^{23} c. 4.8\times10^{23}d.3.2\times10^{23} 14. At what pressure will the mean-free-path be 50\times10...

1 year ago

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 year ago

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 by the ball and how long does it take to return to the point it was thrown? (a) 20 s (b) 20.4 s (c )0.20~s(d)2.04 s 2. An objec...

1 year ago

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 (b) algebraic sum of forces acting at that point (c) product of force and perpendicular distance of its line of action from the...

1 year ago

Question 14 to 16. 14. The potential energy in an elastic string of force constant k which has been extended by x metres is expressed as (a) \frac{1}{2}kx^{2} (b) kx^{2}(c ) kx (d) \frac{1}{2}kx 15. The point beyond which stretched spring does not return...

1 year ago

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 50° with the ground, the work done in pushing the wheelbarrow through a distance of 50m is (a) 3124) (6) 3124MW (c) 3124W (d) 312...

1 year ago

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 1.67x10k-¹ (a)502.7cm² (b) 500.84cm² (d)500.05cm² (c)500.42cm³ The pressure and absolute temperature of the gas sample whose vo...

1 year ago

Question 28 28. The pressure and absolute temperature of the gas sample whose volume is fixed are related with one or more of the following ( 1)\frac{p_{1}}{r_{1}}=\frac{p_{2}}{r_{2}} (b) () \frac{p_{2}}{r_{1}}\approx\frac{p_{1}}{r_{2}} ) \frac{p_{1}}{T_{...

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Question 1. 1. ............................is an input device that utilizes a light-sensitive

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Question 2. 2. Word processing package is a type of software that can be described as an..................

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Q3. 3. Providing the user interface, controlling the computer's resources and running of programs are some functions of.........................

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Question 4. 4. ALU performs Logical operations in addition to....................

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Question 5. 5. The general speed of microprocessor chip is measured in...............

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Question 6. 6. .....................Is the unit responsible for converting the data received from the user into computer understandable format.

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Question 7. 7. ...................is the process of producing useful information for the user.

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Question 8. .................................8. are the devices that is used to print single or multiple-colored images and drawings.

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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

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Question 10. 10. The first-generation computer is known to have used vacuum tubes and............................

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egulation of a a) Homeostasis nearly constant b) Hormone internal c) Enzyme environment is d) Humidity

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Question 16 to 30. 16. When organisms get rid of unwanted materials from their bodies they carryout a) urination b) Faeces c) Excretion d) Abortion 17. The particular location of a gene on the chromosome called a) Gene b) Locus c ) Allele d) Nucleus 18. P...

1 year ago

Question 21 to 28. 21. The upward movement of water and nutrients in plants is primarily driven by_a) Capillary action b) Gravity c) Root pressure d) Transpiration 22. The word "cell" was first observed in 1665 by a scientist called a) Mathias Schleden b)...

1 year ago

Question 29 to 30. 29. The following are animals that exhibit internal fertilization except a) Human b) Cow c) Dog d) Fish 30. Testes are located in a sac called Sperm a) Ureter b) Bladder d)Scrot

1 year ago

Question 1 to 14. 1 ............is the wit of the computer that performs the Arithmetic, moving, and processing of information 2. ............ refers to the worldwide link of computers. 3. The bodily components of a computer can also be referred as..........

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Question 15 to 19. 15. The task of performing operations like arithmetic and logical operations s is called........... 16........ and........ might be the major motives for computer networks. 17.......... is the name of the network topology in which there...

1 year ago

Question 20 to 24. 20. A trackball is an example of the common computer a) Input devices b) Output devices c)Processing devices d) input and output. 21. The name of the program that displays the on- screen elements with which a user interacts is a) Softwa...

1 year ago

Question 21 to 24. 21. The name of the program that displays the on- screen elements with which a user interacts is a) Software System d) Application software c) Operating b) Utility program 22. Computers that manage network resources and provide centrali...

1 year ago

Question 20 to 21 20. A trackball is an example of the common computer a) Input devices b) Output devices devices c) Processing d) input and output 21. The name of the program that displays the on- screen elements with which a user interacts is a) Softwar...

1 year ago

20. A trackball is an example of the common computer a) Input devices b) Output devices devices c) Processing d) input and output

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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 a) utility program d) Application software c) Operating

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Question 22 to 24. 22. Computers that manage network resources and provide centralized storage areas are referred to as ) a workstations Clients d) Services b) Servers c) 23. Which of the following specifies the format of the packets that are sent and rec...

1 year ago

22. Computers that manage network resources and provide centralized storage areas are referred to as a) workstations b) servers C) Clients d) Services

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Question 23 to 24. 23. Which of the following specifies the format of the packets that are sent and received among router and end systems? a) IP protocol b) formatting protocol c) processing protocol d) TCP 24. TCP offers one of following services to the...

1 year ago

Question 23 23. Which of the following specifies the format of the packets that are sent and received among router and end systems? a) IP protocol b) formatting protocol c) processing protocol d) TCP

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24. TCP offers one of following services to the processes at the application layer a) linkage delivery service b) optimization service c)Stream Delivery Service is one d) link dat

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1. a. Copy and complete the following table of difference between FTP and TFTP S.N. Parameter FTP TFTP Operation Authentication Transferring Files 2 Yes No 3 Protocol 4 Ports 21-Control, 20 - Data 5 Control and Data 6 Data Transfer Reliable Unreliable b....

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2. a. Briefly explain the classes of language translators given at-least an example for each b. Define communication software and briefly explain the types of communication software citing relevant examples C. State any four advantages of mesh topology yo...

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17........... is the name of the network topology in which there are bidirectional links between each possible node

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18............. is a carrier used to interconnect computers in a network, such as coaxial cable, twisted pair and optical fibre cable

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19........... Is the set of defined rules that allows devices to communicate across the network.

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Question 1 to 7. Q1.In Mendeleev's periodic table, elements are arranged in the increasing order of their (A) numbers of neutrons (B) atomic number (C)Atomic weight (D) Atomic volume Q2) The law of trend in periodic table was proposed by (A) Dobereiner (B...

1 year ago

Question 7 to 20 Q7) All are periodic properties except (A) ionization energy (B) electronegativity ( dipole rooment (D) electron affinity Q8) The force with which atoms combine with each other, is called bond (C) three (D) none of these Q9) The formation...

1 year ago

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) 8kJ (B) 12kJ (C) 20kJ (D) -12kJ Q22) For an equilibrium to be established, one of the following must always hold. (A) r_{f}=1(...

1 year ago

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 Ka (D) Ka and Kb Q24) The equilibrium partial pressures of H_{2}, S_{2} and H_{2}S gases are 0.2atrn, 0.2atrn and 1.6atm, res...

1 year ago

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 che overall order is 3. What is the order with respect to [HBr]? (A) 1 (B) 2 (C) 3 (D) 4 Q36) The term "atom" comes from Gree...

1 year ago

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 Question 37 to 50 Q37) expressed that all matter consists of a very small indivisible particle called atom. (A) John Dalton(B) Democ...

1 year ago

Question 51 to 70. Q51) London force is also known as (A) dispersion force (B) Vander-Waals forces (C) hydrogen bonding (D) covalent bonds Q52) HCl is an example of (A) dipole-dipole interactions(B) dipole-induced dipole interactions (C) London interactio...

1 year ago

Question 1 to 17. 1. According to Bronsted - Lowry definition, an acid is a (a) Proton acceptor (b) proton donor (c) electron pair acceptor (d) none of these 2. An acid reacts with a trioxosulphate (iv) salt to liberate colorless and odorless (b) efferves...

1 year ago

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) 1.758820 x 10¹¹ ckg (c) 1.758820 × 1010 Ckg-1 (d) 1.708820 × 1011 Ckg-1 20. Who did the oll drop experiment? (a) R.A Millikan (b...

1 year ago

1a. With equations, explain (1) Oxidation and (il) Dehvaration 5. How does (1) rock type (ii) slope (iii) climate influence weathering? c. Explair how (i) geological factor and (ii) over grazing cause erosion

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3a. Why do rocks formed at greater depths weather easily under surface conditions? b. With equations, state what is leaching c. What are the residual minerals of Quart, Fe-Mg minerals and calcite after weathering?

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4a. Draw the rock cycle. State two characteristics of the three (3) main rock types b. State three (3) characteristics of a mineral. c. State the composition and three (3) properties of the core.

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4a. Draw the rock cycle. State two characteristics of the three (3) main rock types

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Q1. Positive and negative natural numbers are called (A) (C) Irrational numbers Q2. The sum of the first 16 terms of the sequence : 2,5,3,11,14,...,fs (A) 196 Q3. Which term of the sequence \overline{2187,729,243,...is=?} \frac{1}{9}? (A) 10 Rational numb...

1 year ago