Numerade

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--- ### **Q.I: Select the correct answer.** 1. Addition of glycerol is recommended for titration of A) Boric acid B) Hydrochloric acid C) Oxalic acid D) All of the mentioned 2. Double indicator titrations can be used when the difference between pKa of two acids equal to A) One unit B) Two units C) Three units D) Four units 3. One molar solution of sodium hydroxide contains A) 4 gram L B) 14 gram L C) 10 gram L D) 24 gram L 4. pH value of 0.01 molar hydrochloric acid solution is A) 1 B) 2 C) 0.1 D) 0.01 5. Methyl orange and phenolphthalein can be used as an indicator for determination of A) Salicylic acid B) Acetic acid C) Boric acid D) All of the above 6. Methyl orange indicator effective range is A) 5-6.2 B) 7-8.5 C) 3.1-4.4 D) 1-2 7. Back titrations can be used mainly for A) Nonvolatile substances B) Soluble substances C) Volatile substances D) Colloidal substances 8. When the titration recommends adding of known excess reagent it is known as A) Direct titrations B) Indirect titrations C) Back titrations D) All of the above 9. The characters of the chemical reaction recommended for volumetric analysis are A) Slow B) Simple C) Complex D) All of the above 10. For a good indicator, effective range should not exceed A) 1 pH units B) 2 pH units C) 3 pH units D) 4 pH units --- ### **Q.II: Write short notes on the following.** 1. Requirements for volumetric titrations 2. Determination of mixture of hydrochloric acid and acetic acid 3. Reasons for using back titrations

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List and explain three specific examples from everyday life of energy changing form

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Question 22 22. Which of the following statements is not true about the diet of aging individuals? a. their kilocalorie needs decrease b. their calcium needs increase c. their vitamin D needs increase d. their sodium needs increase 1 pts

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QUESTION 3 Claims are: a. Something that is known to be true O b. Assertions about the way things are or should be c. Always supported by evidence O d. b & c O e. All of the above (a, b, c) are characteristics of claims

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The text appears to be free of spelling, typographical, grammatical, OCR, and mathematical errors. The formatting is clear and coherent.

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The manufacturing department of Closets! Closets! Closets! Inc. has current sales of $1,300,000, current operating income of $182,000 and an investment turnover of 1.5. What is Closets! Closets! Closets! Inc's current return on investment (ROI)? Group of answer choices a- 28% b- 21% c- 9.3% d- 14%

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Q3] (10 Marks) Create a Visual Basic Project to find the value of the following series. $y = \frac{2}{x^2} - \frac{3}{x^6} + \frac{4}{x^{12}} - \frac{2}{x^8} + \frac{3}{x^{15}} - \frac{4}{x^{24}} \dots$, where $x$ are constants.

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1. (20 points) a three-bit pulse mode counter with pulse input x1 and x2. When pulse x1 arrives, the counter counts with the following sequence: 0 -> 3 -> 5 -> 6 -> 1 -> 7 -> 2 -> 4 When pulse x2 arrives, the counter counts with the following sequence: 0 -> 7 -> 5 -> 3 -> 6 -> 2 -> 4 -> 1 Use D-flip-flop in the master rank. (a) Construct a counter state transition table (b) Construct the excitation table for the pulse-mode counter (c) Perform logic minimization. Solution:

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Can a triangle be constructed with sides of lengths 3 cm, 7 cm, and 8 cm? Solution: 3 + 7 > 8 7 + 8 > 3 3 + 8 > 7 Sum of any two lengths is greater than the third length.

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Let X be a discrete random variable for which $E[X] = \mu$ and $Var(X) = \sigma^2$. (a) Show that $E[X(X - 1)] = \mu(\mu - 1) + \sigma^2$. (b) Show that $E[(X - c)^2] = (\mu - c)^2 + \sigma^2$ for any constant c.

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tyler h.