Question

1) How many moles are in 4.4 g of CO2? (Molar Muss of CO2 = 44 u) 2) 10℃ = ………………………………………. ℉. 3) How many neutrons are in 52 2 + 25 4) Which of the following set of quantum number is not possible? (A) n=3, l=2, m=-1, s=-1/2 (B) n=4, l=2, m=-2, s=+1/2 (C) n=3, l=1, m=2, s=-1/2 (D) n=4, l=1, m=1, s=+1/2 5) Write ground state electronic configuration of Cr. Section – B  Answer the question no. 6 to 8 in brief. Each of 2 mark. [06] 6) What is the concentration of sugar (C12 H22 O11) in mol L-1 if its 20 g are dissolved in enough water to make a final volume up to 2 L? [ Atomic mass : C=14, H=1, O=16 u ] OR 6) Calculate the mole fraction of ethanol in solution prepared by dissolving 46 g of ethanol in 90 g of water. [Molar mass of ethanol = 46 u] 7) Calculate wavelength of an electron moving with a velocity of 2.05 × 107 ms-1 [ Mass of electron = 9.1 × 10 -31 kg] 8) State the limitation of Bohr’s atomic model. UNIT TEST STANDARD - 11 TOTAL MARKS - 25 SUB - CHEMISTRY TIME -1 Hr. CODE – 052 MEDIUM - ENGLISH X ? Section – C  Answer the question no. 9 to 11 in detail. [Each of 3 mark] 9) Chlorine is prepared in the laboratory by treating MnO2 with aqueous hydrochloric acid according to reaction 4 HCl(aq) + MnO2(s) 2H2O(l) + MnCl2(aq) + Cl2(g) How many grams of HCl react with 5 g of MnO2? [ Atomic Mass : Cl = 35.5 and Mn =55 u ] 10) State the points of Dalton’s atomic theory. 11) Yellow Light emitted from a sodium lamp has wavelength () of 580 nm. Calculate the frequency (V- ) and wavenumber (V - ) of the yellow light OR 11) What is the number of photons of light with a wavelength of 4000 pm that provide 1 J of energy? Section – D  Answer the following question no. 12 as directed. 12)Explain electronic configuration of He and N according to Pauli and Hund’s principle.

Answer 1

Answer:

gshsjksksgsusejjejeuyafw hshshsjososo ahead and the world to me and I

Explanation:

very good time in a few days ago I am so proud to

gshaha ty for a few days ago I was a few days later

Answer 2

Answer:

Basic Korean Phrases

neh. Yes.

ah-nee-oh. No.

jwe-song-ha-ji-mahn. Please.

gahm-sah-hahm-ni-da. Thank you.

chon-mahn-eh-yo. You're welcome.

sil-le-hahm-ni-da. Excuse me.

ahn-nyong-ha-se-yo. Good morning.