- Organic Chemistry
- Aldehydes and Ketones
- Alkyl Halides, Alcohols and ethers
- Amines and other nitrogen compounds
- Aromatic Chemistry
- Carbohydrates, Amino acids, protein, Vitamin and Fat
- Carboxylic acids and its derivatives
- Chemistry in daily life
- General Mechanism in organic compounds
- Hydrocarbons
- Nomenclature and isomerism
215 - Chemistry Questions Answers
IS BASICITY OF ACETIC ACID IS 1? PLS SEND THE BASICITY OF OTHER ACIDS WHICH ARE USUALLY ASKED IN ENTRANCE EXAM
HCl, HNO3 , HCOOH are mono basic acids
COOH-COOH, H2SO4 are di basic acids
similarly others
what is the relation b/w E1 &E2 whose respective wavelength r 400& 800 Ao . SIR I WANT TO KNOW THE RELATn b/w ENERGY & WAVELENGTH . ARE THEY DIRECTLY PROPTIONAL ? ANS OF THIS QUES IS E1=2E2
E = hc/λ
so E is inversely proportional to λ
THE FIRST EMISSION LINE IN THE ATOMIC SPECTRUM OF HYDROGEN IN BALMER SERIES APPEAR AT ?
ANS 5R/36cm-1
for balmer series of hydrogen atom
1/λ = R ( 1/22 - 1/32)
solve for λ
IF n & l are principle & azimuthal quantum no. respectively then expression for calculating total no. of e- in any energy level is?
summation from l=0 to n-1 (2(2l+1)) HOW
for nth level values of l will be 0, 1, 2, 3, 4, 5, .....................(n-1)
for l = 0 means s subshell no. of electrons = 2 = 2(2*0+1)
for l = 1 means p subshell no. of electrons = 6 = 2(2*1+1)
for l = 2 means d subshell no. of electrons = 10 = 2(2*2+1)
similarly for others
0.2 g OF SAMPLE OF H2O2 REQUIRED 10ml OF 1N KMnO4 SOLn IN A TITRATION IN +NCE OF dil H2SO4 . THE % PURITY OF H2O2 IS?
ANS 85
No. of gm. equivalent of KMnO4 = No. of gm. equivalent of H2O2
so 1*10/1000 = x / 17 (17 is eq. wt. of H2O2)
so x = 0.17
so % purity = 0.17*100/0.2 = 85
HOW MUCH WATER IS TO BE ADDED TO DILUTE 10ml OF 10N HCl TO MAKE IT DECINORMAL ?
ANS 100ml
N1V1 = N2V2
so 10*10 = 0.1*v
or v = 1000 ml
so extra water added will be 990 ml
the normality of 10% (w/v) acetic acid is ?
1.7N
10 % w/v acetic acid means 10 gm. in 100 ml. soln.
so 1000 ml soln. contains 100 gm acetic acid
so 1 litre contains 100/60 moles of acetic acid
so M = 100/60 = 1.67
so N = M * basicity = 1.67*1 = 1.67
the ques which i have already submitted i.e. d ques in which we have to find min transitional energy in terms ofRH , IS THE ANS IS RH. PLS AGAIN TELL THAT SOLn so that i can understand more easily
for max transitional energy we will use
E = hcRH {1/12 - 1/∞2}
so E will be proportional to RH
oxide of E react with KOH & give compd like KMnO4 WHAT IS THE FORMULA OF OXIDE OF E
EO
E2O3
E2O7 OR ANY OTHER ANS (& IF ANY OTHER ONE THEN GIVE THAT ANS WITH SOLn)
- 2 EO2 + 4 KOH + O2 → 2 K2EO4 + 2 H2O
- and
- 3 K2EO4 + 2 CO2 → 2 KEO4 + 2 K2CO3 + EO2
- so oxide will be EO2
IF D POSITn OF Na+ & Cl - rR INTERCHANGED IN NaCl having FCC ARRANGEMENT OF Cl- THEN IN D UNIT CELL OF NaCl
Na + WILL INCREASE BY 1 WHILE Cl- DECREASE BY 1
PLS TELL D REASON
No,
These will be no change by making this type of change