Ncert Solutions Chemistry Class 11th
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Water sample is called cleanest on the basis of which one of the BOD values given below:
Water sample is called cleanest on the basis of which one of the BOD values given below:
BOD is biological oxygen demand which represents the amount of oxygen required to degrade organic matter in water.
Higher the BOD more polluted the water is
So; here water sample with BOD = 3 ppm is the cleanest
Upvote 
Choose the correct order of density of the alkali meals:
Choose the correct order of density of the alkali meals:
Density of metal a very specific and depends upon many factors.
Li -> 0.53 gm/cm3
Na -> 0.97 gm/cm3
K -> 0.86 gm/cm3
Rb ->1.53 gm/cm3
Cs -> 1.90 gm/cm3
Upvote The measured BOD values for four different water sample (A-D) are as follows
A = 3 ppm; B = 18 ppm: C = 21 ppm; D = 4 ppm.
The water samples which can be called as highly polluted with organic wastes, are
The measured BOD values for four different water sample (A-D) are as follows
A = 3 ppm; B = 18 ppm: C = 21 ppm; D = 4 ppm.
The water samples which can be called as highly polluted with organic wastes, are
Highly polluted water has higher value of BOD ≥17 ppm
Upvote Which one of the following is an example of disproportionation reaction?
Which one of the following is an example of disproportionation reaction?
The oxide which contains an odd electron at the nitrogen atom is
The oxide which contains an odd electron at the nitrogen atom is
Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to
Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to
During removal of temporary hardness of water.
Upvote Identify the correct statement from B2H6 from those given below :
(A) In B2H6, all B-H bonds are equivalent
(B) In B2H6, there are four 3-centre 2- electron bonds
(C) B2H6 is a Lewis acid
(D) B2H6 can be synthesized from both BF3 and NaBH4.
(E) B2H6 is planar molecule.
Choose the most appropriate answer from the options given below :
Identify the correct statement from B2H6 from those given below :
(A) In B2H6, all B-H bonds are equivalent
(B) In B2H6, there are four 3-centre 2- electron bonds
(C) B2H6 is a Lewis acid
(D) B2H6 can be synthesized from both BF3 and NaBH4.
(E) B2H6 is planar molecule.
Choose the most appropriate answer from the options given below :
B2H6 has 4 2 c -2e bonds and 2 3c-2e bonds.
Bridging (B-H) bonds have more value of bond- length then terminal (B – H) bonds
Bridging bonds are in one plane, but terminal bonds are in perpendicular plane.
Due to presence of (3c-2e) bonds, it behaves as electrons deficient and prone to get attached by &
Upvote Which of the following statements are correct?
(A) Both LiCl and MgCl2 are soluble in ethanol
(B) The oxides Li2O and MgO combine with excess of oxygen to give superoxide.
(C) LiF is less soluble in water than other alkali metal fluorides.
(D) Li2O is more soluble in water than other alkali metal oxides.
Choose the most appropriate answer from the options given below :
Which of the following statements are correct?
(A) Both LiCl and MgCl2 are soluble in ethanol
(B) The oxides Li2O and MgO combine with excess of oxygen to give superoxide.
(C) LiF is less soluble in water than other alkali metal fluorides.
(D) Li2O is more soluble in water than other alkali metal oxides.
Choose the most appropriate answer from the options given below :
Due to higher extent of polarization by Li+ and Mg2+, LiCl and Mgcl2 have covalent character. Therefore they are soluble in ethanol.
Due to very high value of lattice energy, LiF is having very less solubility in water.
Upvote The highest industrial consumption of molecular hydrogen is to produce compounds of element :
The highest industrial consumption of molecular hydrogen is to produce compounds of element :
The highest industrial consumption of hydrogen gas is in the synthesis of ammonia gas (Having manufacturing of N-based fertizers)
Upvote The highest industrial consumption of molecular hydrogen is to produce compounds of element :
The highest industrial consumption of molecular hydrogen is to produce compounds of element :
The highest industrial consumption of hydrogen gas is in the synthesis of ammonia gas (Having manufacturing of N-based fertizers)
Upvote