Which of the following is a strong electrolyte? (a) NaNO_3 (b) H_2S (c) CO_2 (d)

Question

Which of the following is a strong electrolyte? (a) NaNO_3 (b) H_2S (c) CO_2 (d) NH_3 Which of the following gases effuses the fastest? (a) He (b) Ne (c) Ar (d) F_2 Which of the following items has the shortest de Broglie wavelength when they all move at the same speed? (a) proton (b) neutron (c) bee (d) Dr. Chang Which of the following has the lowest first ionization energy? (a) K (b)Ca (c)Se (d) Br Which of the following species has the largest radius? (a) Li^+ (b)AI (c)Cl^-(d)F Which of the elements listed below would most likely form a polar covalent bond when bonded to oxygen? (a)Al (b)Na (c)C (d) O Which one of the following molecules is nonpolar A) NH_3 B) OF_2 C) CH_3CI D) H_2O E) BeCI_2 A 45 mL sample of nitrogen gas is cooled from 135degreeC to 15degreeC in a container that can contract or expand at constant pressure, what is the new volume of the nitrogen gas? A) 64 mL B) 5.0 mL C) 410 mL D) 32 mL H) 41 mL

Explanation / Answer

I have solved first four problem, post one more question to get the remaining answers

1) NaNO3 is a salt of strong acid HNO3 and strong base NaOH, hence it will dissociate completely forming Na+ and NO3-, hence NaNO3 is highly ionic in nature and will be a strong electrolyte

2) Effusion rate is inversely proportional to the mass

Since the mass of Helium is lowest, hence the effusion rate will be highest for Helium

Hence the correct answer is Option A

3) Debrogile wavelength, lambda = h/mv

Since the mass of Dr.Chang will be highest hence the debrogile wavelength will be least for Dr. Chang

Hence the correct answer is Option D

4) The correct answer is Option A, since K will lose one electron to form nearest inert gas configuration

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