Explore topic-wise InterviewSolutions in Current Affairs.

Answer:

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Explanation:

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ANSWER:

f

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f

f is your CORRECT answer

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Cross-pollination is the TRANSFER of pollen from the anther of one flower to the STIGMA of another flower on a different individual of the same species. Self-pollination occurs in flowers where the stamen and carpel mature at the same time, and are positioned so that the pollen can land on the flower's stigma.

ANSWER:

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EXPLANATION:

Explanation:

Use sodium hydroxide's MOLAR mass to DETERMINE how MANY grams would contain this many moles. If you add 0.64 g of solid sodium hydroxide to the STOCK solution you'll GET a 0.2-M solution of (approximately) the same volume.

<STRONG>Answer:

sodium acetate formed by reaction of WEAK acid acetic acid and strong BASE sodium HYDROXIDE

ANSWER:

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f

f

t

gg

y

s

s

s

s

ss

d

d

d

d

d

d

d

ANSWER:

disha ye kon hai

Explanation:

AAP jante HO KYA

Answer:

Aur agar maine air badhadi to .

take care,STAY safe.

good morning.

have a good afternoon.

have a nice lunch.

have a nice day.

Always be happy .

you are a nice person.

because you are special.

I hope you & your LOVED ones are staying safe & healthy.

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May god bless you &

people help you.

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ANSWER:

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the branch of SCIENCE concerned with the substances of which matter is COMPOSED, the INVESTIGATION of their properties and reactions, and the use of such reactions to FORM new substances.

2.

the complex emotional or psychological interaction between people.

ANSWER:

C AND D

Explanation:

MAKE AS BRAINALIST

Answer:

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ANSWER-

RUTHERFORD deduced that the atomic nucleus was positively CHARGED because the ALPHA particles that he fired at the METAL foils were positively charged, and like charges repel. ... In Rutherford's experiments most of the alpha particles passed straight through the foil without being deflected

Here is your answer..

GLUE because the MOLECULE ATTRACT each other

ANSWER:

A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a CONVENIENT unit to use because of the great number of atoms, molecules, or others in any substance.

Answer:

We found that toothpaste COVERED EGG STAINED LESS than that non toothpaste covered egg.

ANSWER:

DISSOLUTION of SUGAR and water

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EXPLANATION:

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ANSWER:

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Answer:

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ANSWER:

INTERNATIONAL union of PURE and applied CHEMISTRY

Explanation:

ANSWER:

here is the lecture!

Explanation:

Atomic Mass

Atomic mass is based on a relative scale and the mass of 12C

(carbon twelve) is DEFINED as 12 amu; so, this is an exact number.

Why do we specify 12C? We do not simply state that the mass of a C atom is

12 AMU because elements exist as a variety of isotopes.

Carbon exists as two major isotopes, 12C, and 13C ( 14C exists and has

12.011 amu. No single carbon atom has a mass of 12.011, but in a handful

of C atoms the average mass of a carbon atom is 12.011.

Why 12.011?

If a sample of carbon was placed in a mass spectrometer the

spectrometer would detect two different C atoms, 12C and 13C.

The natural abundance of 14C, 10C and 11C in geologic (i.e. old) samples is so low that we cannot

detect the effect these isotopes have on the average mass.

From the information collected from the mass spectrometer the average

mass of a carbon atom is calculated.

The mass of 12C is, of course, 12 amu.

13C is 1.0836129 times heavier than 12C; so, the mass of 13C is 13.003355

24

amu.

98.89% of the sample is 12C, and

1.11% of the sample is 13C.

So, the natural abundance of 13C is 1.11%, and the natural abundance of 12C is 98.89%

The average mass is simply a weighted average.

If we know the natural abundance (the natural abundance of an

isotope of an element is the percent of that isotope as it

occurs in a sample on EARTH) of all the isotopes and the mass

of all the isotopes we can find the average atomic mass. The

average atomic mass is simply a weighted average of the masses of all

the isotopes.

average mass C = (0.9889 x 12(exact) amu) + (0.0111 x 13.00335)

amu

= 11.8668 + 0.144337

= 12.011137185

12.01 amu

Determine the average atomic mass of oxygen.

Isotope Atomic Mass

(amu)

Natural

Abundance

16  

8O 15.99491 99.759%

17  

8O 16.99913 0.037%

18  

8O 17.99916 0.204%

25

average mass = (15.99491 amu x 0.99759) + (16.99913 amu x 0.00037) +

(17.99916 amu x 0.00204)

average mass = 15.999 amu

Sig figs above are correct. After the multiplication step the significant figures which

remain are in red. The last place that can be used after adding is the thousandths place.

0.00629

15.99937

+ 0.03672

15.95636

Another kind of question could be asked...

Copper has two isotopes 63Cu and 65Cu. The atomic mass of copper is

63.54. If the atomic masses of 63Cu and 65Cu are 62.9296 and 64.9278 amu

respectively what is the natural abundance of each isotope.

ave mass = (% 63Cu /100 x mass 63Cu amu) + (% 65Cu /100 x mass 65Cu amu)

63Cu 62.9296 amu

65Cu 64.9278 amu

63.54 amu = (% 63Cu /100 x 62.9296 amu) + (% 65Cu /100 x 64.9278 amu)

since (% 63Cu) + (% 65Cu) = 100

(% 63Cu) = 100 – (% 65Cu)

substitute

63.54 amu = ((100 – % 65Cu)/100 x 62.9296 amu) + (% 65Cu /100 x 64.9278 amu)

solve,

63.54 amu = 62.9296 amu – 0.629296 (% 65Cu) + 0.649278 (%

65Cu)

0.6104 = 0.019982 (% 65Cu)

26

31.0479 = (% 65Cu)

(% 65Cu) = 31.05

(% 63Cu) = 68.98

Of course, a question like the one above could be turned around

another way.

Gallium, atomic mass 69.72 amu, has two major isotopes, 69Ga, atomic

mass 68.9257 amu, and 71Ga. If the natural abundance of each

isotope is 60.00 and 40.00 % respectively, what is the mass (in amu) of

71Ga.

69.72 amu = (0.6000 x 68.9257 amu) + (0.4000 x 71Ga)

71Ga = 70.9249 amu

27

The mole

Element Average Mass

of

1 Atom

Average Mass

of

100 Atoms

C 12.01 amu 1,201 amu

H 1.0079 amu 100.79 amu

W 183.9 amu 18,390 amu

1 Atom 100 Atoms

(AMU) (AMU)

C = 12.01 = 1201 = 1  

H 1.0079 100.79 0.08400

C = 12.01 = 1201 = 1  

W 183.9 18390 15.31

As long as we count the same number of atoms the ratio of the

atomic masses stays the same.

Since atoms of C are so small, we could place enough of them on a

balance so that the mass would be 12.01 g.

The same could be done with W; that is, 183.9 g of W could be

placed on a balance.

mass of W = 183.9 g = 15.31

mass of C 12.01 g 1

Since the ratio of the masses is the same, each sample contains

28

the same number of atoms.

We have given this special number of atoms a name. It is a mole.

Even before a mole could be calculated it was used.

1 mole of C atoms » 6.02214 x 1023 atoms » 12.01 g of C atoms

1 mole of eggs » 6.02214 x 1023 eggs

29

The atomic mass of C is 12.01 amu. What is the mass of 1 C atom?

1 C atom

6.02214 x 1023 C atoms 1 mol C atoms

1 mol C atoms 12.011 g C x x = 1.9945 x 10-23 g C

Molar Mass/Molecular Mass

The molar mass of a molecule is simply the SUM of the atomic masses.

CH4

= 1 mole C atoms + 4 moles H atoms

12.01 12.01

+ 4 x 1.0079 + 4.0316

16.0416 = 16.04 g/mole

30

Answer:

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Explanation:

C)coal

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Answer:

C WATER vapour.

EXPLANATION:

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ANSWER:

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the smallest unit of life is known as CELL

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ANSWER:

A COLLOID is a heterogeneous mixture whose particles are not as small as solution but they are so small that cannot be seen by naked eye. When a beam of light is passed through a colloid then the PATH of the light becomes visible. For example milk, smoke etc

Explanation:

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Explanation:

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Answer:

39.997 g/mol

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ANSWER:

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Answer:

EXPLANATION:

Solution

verified

Verified by Toppr

The balanced EQUATION is,

2C  

2

​

H  

6

​

+7O  

2

​

→4CO  

2

​

+6H  

2

​

O

As rate of DIFFUSION is inversely PROPORTIONAL to square root of MOLAR mass, Gas with lowest molar mass will have HIGHEST rate of diffusion

ANSWER:

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Answer:

a) 48% B) 43%

EXPLANATION:

a) Limestone formula = CACO3

Mass of Limestone = 40+12+3×16 = 100

Mass of OXYGEN in Limestone = 48

Percentage of Oxygen = Mass of O in CaCO3/ Mass of CaCO3×100 = 48/100×100 = 12/25×100 = 48%

b) Washing soda formula = Na2CO3

Mass of washing soda = 2×23+12+3×16 = 106

Mass of SODIUM in washing soda = 46

Percentage of Sodium = Mass of Na in Na2CO3/ Mass of Na2CO3 ×100 = 46/106×100 = 23/53×100 = 43%

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ANSWER:

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Answer:

An imbalance or overproduction of ACID in the mouth is the root of bad oral health as it promotes plaque formation and tooth erosion. From this point of VIEW, using BAKING soda to prevent tooth decays effectively as it rebalances the ph level inside the mouth.

Explanation:

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Explanation:

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Answer:

Anomalous behaviour of lithium with respect to other alkali metals: The melting POINT and boiling point of lithium are higher that than other alkali metals. The hardness of lithium is higher than other metals. Lithium NITRATE decomposes to form an oxide WHEREAS other metals on HEATING give nitrites.

Explanation:

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Answer:

two moles of an ideal gas are EXPANDED isothermally and reversible from 20 L to 30 L at 300 K calculate work done ( R= 8.314 J K-1mol-1)

ANSWER:

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EXPLANATION:

SERIOUSLY ha ha ha (σ≧▽≦)σ

kyu??

ANSWER:

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EXPLANATION:

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ANSWER:

GOOD, good, good MORNING

ANSWER:

sodic SOIL

EXPLANATION:

Answer:

NUMBER of moles of NA  

2

​

CO  

3

​

=  

106

25.3

​

=0.239 moles

Molarity of SOLUTION=  

0.25

0.239

​

=0.956mol/litre

Na  

2

​

CO  

3

​

⟶2Na  

+

+CO  

3

2−

​

∴ CONCENTRATION of CO  

3

2−

​

=0.956M

Concentration of Na  

+

=2×0.956=1.912M

Answer:

Tidal energy is similar to traditional hydroelectric POWER in that it harnesses the KINETIC energy of MOVING water. ... Dynamic tidal power utilizes dams stretching into the OCEAN to HARNESS the kinetic energy of tides across a wide area, rather than in concentrated streams.