52639 + Interview Questions in Secondary School in Chemistry

1.	Reactions of electrolytic decomposition of molten sodium chloride
Answer» Reaction for decomposition of MOLTEN common SALT is PINNED with it

1.

Reactions of electrolytic decomposition of molten sodium chloride

Answer»

Reaction for decomposition of MOLTEN common SALT is PINNED with it

2.	Name two elements which exhibit the property of catenation
Answer» ,...................... CARBON ..HOPE so ,don't KNOW CLEARLY.

Discussion

3.	Naphthalene reaction with nitric acid and sulphuric acid
Answer» Explanation: QUERCUS infectoria, the Aleppo oak, is a species of oak, bearing galls that have ... The GALLIC and ellagic ACID hydrolyzable tannins react with proteins to produce TYPICAL tanning effects; ...

3.

Naphthalene reaction with nitric acid and sulphuric acid

Answer»

Explanation:

QUERCUS infectoria, the Aleppo oak, is a species of oak, bearing galls that have ... The GALLIC and ellagic ACID hydrolyzable tannins react with proteins to produce TYPICAL tanning effects; ...

Discussion

4.	State and explain oswalds dilution law.Mentions its limitations
Answer» LIMITATIONS of astwald dilution law limitation of oswalds dilution law the law HOLDS goods only for weak electrolyte and fail completely in the case of STRONG electrolytes

Discussion

5.	State any five chemical properties that prove aluminium is a metal
Answer» Explanation: it is a good CONDUCTOR of electricity it is mellable it is DUCTILE it has lucture REACTS with air and produce aluminium OXIDE reacts with water it reacts with acid to produce salt and hydrogen hope this answer helps u

5.

State any five chemical properties that prove aluminium is a metal

Answer»

Explanation:

it is a good CONDUCTOR of electricity
it is mellable
it is DUCTILE
it has lucture
REACTS with air and produce aluminium OXIDE
reacts with water
it reacts with acid to produce salt and hydrogen

hope this answer helps u

Discussion

6.	Significance of carboxyllation and decarboxyllation reaction
Answer» Answer: CARBOXYLATION is a chemical REACTION in which a carboxylic acid group is PRODUCED by TREATING a substrate with carbon dioxide. The opposite reaction is DECARBOXYLATION

6.

Significance of carboxyllation and decarboxyllation reaction

Answer»

Answer:

CARBOXYLATION is a chemical REACTION in which a carboxylic acid group is PRODUCED by TREATING a substrate with carbon dioxide.

The opposite reaction is DECARBOXYLATION

Discussion

7.	Why dissolution increase increase with temperature
Answer» ANSWER: For many solids DISSOLVED in liquid water, the solubility INCREASES with temperatures. I hope this helps you PLEASE MARK as Brainliest

7.

Why dissolution increase increase with temperature

Answer»

ANSWER:

For many solids DISSOLVED in liquid water, the solubility INCREASES with temperatures.

I hope this helps you

PLEASE MARK as Brainliest

Discussion

8.	A most active non metal displace a less active non metals from its _____ in solution
Answer» HEYA UR ANSWER IS..... compound (salt)

8.

A most active non metal displace a less active non metals from its _____ in solution

Answer»

HEYA UR ANSWER IS.....

compound (salt)

Discussion

9.	State de broglies hypothesis.
Answer» EXPLANATION: The de BROGLIE hypothesis states that particles of MATTER can behave as both waves and particles, just LIKE LIGHT.

9.

State de broglies hypothesis.

Answer»

EXPLANATION:

The de BROGLIE hypothesis states that particles of MATTER can behave as both waves and particles, just LIKE LIGHT.

Discussion

10.	Express the relation between conductivity and molar conductive of a solution
Answer» Answer: The molar CONDUCTIVITY of a solution at a GIVEN concentration is the conductance of volume V of a solution containing 1 MOLE of the ELECTROLYTE KEPT between two electrodes with the area of cross-section A and distance of unit length, the conductivity of the solution is given by the following relation.

10.

Express the relation between conductivity and molar conductive of a solution

Answer»

Answer:

The molar CONDUCTIVITY of a solution at a GIVEN concentration is the conductance of volume V of a solution containing 1 MOLE of the ELECTROLYTE KEPT between two electrodes with the area of cross-section A and distance of unit length, the conductivity of the solution is given by the following relation.

Discussion

11.	A most active nommetal displace a less active nonmetals from its ______ in solution
Answer» *<U>here* it UR *ANSWER* *Salt* *hope* *its* *HELP* u

11.

A most active nommetal displace a less active nonmetals from its ______ in solution

Answer»

<U>here it UR ANSWER

Salt

hope its HELP u

Discussion

12.	9. You might have noted that when copper powderis heated in a china dish, the surface of copperpowder becomes coated with a black coloursubstance.(a) How has this black coloured substanceformed?(b) What is that black substance?(c) Write the chemical equation of the reactionthat takes place.[CBSE 2011]
Answer» ⓣⓗⓐⓣ ⓑⓛⓐⓒⓚ ⓢⓤⓑⓢⓣⓐⓝⓒⓔ ⓘⓢ ⓒⓐⓡⓑⓞⓝ... ⓕⓞⓡⓜⓤⓛⓐ. ⓒ ⓕⓞⓡⓜⓔⓓ ⓑⓔⓒⓐⓤⓢⓔ ⓞⓕ ⓒⓔⓡⓣⓐⓘⓝ ⓡⓔⓐⓒⓣⓘⓞⓝⓢ ⓑⓔⓒⓐⓤⓢⓔ ⓞⓕ ⓗⓔⓐⓣ

12.

9. You might have noted that when copper powderis heated in a china dish, the surface of copperpowder becomes coated with a black coloursubstance.(a) How has this black coloured substanceformed?(b) What is that black substance?(c) Write the chemical equation of the reactionthat takes place.[CBSE 2011]

Answer»

ⓣⓗⓐⓣ ⓑⓛⓐⓒⓚ ⓢⓤⓑⓢⓣⓐⓝⓒⓔ ⓘⓢ ⓒⓐⓡⓑⓞⓝ...

ⓕⓞⓡⓜⓤⓛⓐ. ⓒ

ⓕⓞⓡⓜⓔⓓ ⓑⓔⓒⓐⓤⓢⓔ ⓞⓕ ⓒⓔⓡⓣⓐⓘⓝ ⓡⓔⓐⓒⓣⓘⓞⓝⓢ ⓑⓔⓒⓐⓤⓢⓔ ⓞⓕ ⓗⓔⓐⓣ

Discussion

13.	8. Identify the reducing agent in the followingreactions:(a) 4NH, + 50,-→ 4NO + 6H,O(6) H.O + F, - → HF + HOF(c) Fe,O, + 3C0 - 2Fe + 3CO,(d) 2H, + 0, 2H,0
Answer» ANSWER: a-hydrogen b-oxygen c-oxygen d-nothing

13.

8. Identify the reducing agent in the followingreactions:(a) 4NH, + 50,-→ 4NO + 6H,O(6) H.O + F, - → HF + HOF(c) Fe,O, + 3C0 - 2Fe + 3CO,(d) 2H, + 0, 2H,0

Answer»

ANSWER:

a-hydrogen

b-oxygen

c-oxygen

d-nothing

Discussion

14.	15. Fused Nacl conducts electricity because of(a) free ions(b) free electrons(c) free molecules(d) None of these
Answer» ANSWER: this is your answer GUYS below because of FREE IONS

14.

15. Fused Nacl conducts electricity because of(a) free ions(b) free electrons(c) free molecules(d) None of these

Answer»

ANSWER:

this is your answer GUYS below

because of FREE IONS

Discussion

15.	State of matter with example
Answer» ANSWER: Solid Liquid and GAS Explanation: Solid : Ice, IRON etc. Liquid: Water, MERCURY at room temperature Gas: Water vapour, Gaseous oxygen

15.

State of matter with example

Answer»

ANSWER:

Solid Liquid and GAS

Explanation:

Solid : Ice, IRON etc.

Liquid: Water, MERCURY at room temperature

Gas: Water vapour, Gaseous oxygen

Discussion

16.	Lation.”7. Zinc liberated hydrogen gas when reacted withdilute hydrochloric acid, whereas copper doesnot. Explain why?E 2015)
Answer» ANSWER: because COPPER do not have CAPACITY and copper not a LIQUID

16.

Lation.”7. Zinc liberated hydrogen gas when reacted withdilute hydrochloric acid, whereas copper doesnot. Explain why?E 2015)

Answer»

ANSWER:

because COPPER do not have CAPACITY and copper not a LIQUID

Discussion

17.	Write the chemical formula of baking soda and their uses in food
Answer» ANSWER: EXPLANATION: NAHC03 Helps in MAKING cakes

17.

Write the chemical formula of baking soda and their uses in food

Answer»

ANSWER:

EXPLANATION:

NAHC03

Helps in MAKING cakes

Discussion

18.	What happens when samples of metal's and nonmetal are mixed with water
Answer» Answer: ✋ Hello Metals Metals are materials HOLDING or POSSESSING the characteristics of being shiny, hard, FUSIBLE, malleable, ductile, etc. Few EXAMPLES of metals (materials) are – Gold, Silver, Aluminium, Copper, Iron, etc. Non Metals Non – metals are materials not holding the characteristics of metals, means they are not shiny, hard, fusible, malleable, ductile, etc. Many materials like coal and Sulphur are very soft and dull in appearance. They break down into very fine thin powdery mass on tapping with the hammer. They are neither in – sonorous and also are a very poor conductor of heat and ELECTRICITY. Few examples of non – metals are carbon, oxygen, Sulphur, etc FOLLOW ME "B"

18.

What happens when samples of metal's and nonmetal are mixed with water

Answer»

Answer:

✋

Hello

Metals

Metals are materials HOLDING or POSSESSING the characteristics of being shiny, hard, FUSIBLE, malleable, ductile, etc. Few EXAMPLES of metals (materials) are – Gold, Silver, Aluminium, Copper, Iron, etc.

Non Metals

Non – metals are materials not holding the characteristics of metals, means they are not shiny, hard, fusible, malleable, ductile, etc. Many materials like coal and Sulphur are very soft and dull in appearance. They break down into very fine thin powdery mass on tapping with the hammer. They are neither in – sonorous and also are a very poor conductor of heat and ELECTRICITY. Few examples of non – metals are carbon, oxygen, Sulphur, etc

FOLLOW ME "B"

Discussion

19.	Metals and non-metals used in space research, satellites, astronaut's suit , helmet and space programmes ?
Answer» ANSWER: Metals are aluminium chromium alloys of STEEL Non metals are diamond SULPHUR

19.

Metals and non-metals used in space research, satellites, astronaut's suit , helmet and space programmes ?

Answer»

ANSWER:

Metals are aluminium chromium alloys of STEEL

Non metals are diamond SULPHUR

Discussion

20.	The sugar with the molecular formula of c6h12o6 is called
Answer» The SUGAR with MOLECULAR FORMULA C6H12O6 is GLUCOSE

Discussion

21.	Which effect does the concentration of h + Aqueous ion have on the nature of the solution?
Answer» ANSWER: What effect does the concentration of H+(aq) IONS have on the NATURE of the SOLUTION? Answer: The concentration of H+ (aq) ions determines the acidic nature of solution. Hence, acidity of a solution INCREASES with increases in concentration of H+ (aq) ions and vice versa.

21.

Which effect does the concentration of h + Aqueous ion have on the nature of the solution?

Answer»

ANSWER:

What effect does the concentration of H+(aq) IONS have on the NATURE of the SOLUTION? Answer: The concentration of H+ (aq) ions determines the acidic nature of solution. Hence, acidity of a solution INCREASES with increases in concentration of H+ (aq) ions and vice versa.

Discussion

22.	Three uses of sulphur
Answer» Answer: here's your SOLUTION 1) SULFUR is USED as GUN powder in guns. 2) sulphur is used in laboratory for the purpose of chemical reaction. 3) sulfur is used in many industries of non ferrous METALS , pigments. ------" By Enrique

22.

Three uses of sulphur

Answer»

Answer:

here's your SOLUTION

1) SULFUR is USED as GUN powder in guns.

2) sulphur is used in laboratory for the purpose of chemical reaction.

3) sulfur is used in many industries of non ferrous METALS , pigments.

------" By Enrique

Discussion

23.	Weight n volume percent of solutn is 22 n 44 find density
Answer» ANSWER: DENSITY = Mass/Volume Density = 22/44 =1/2 = 0.5

23.

Weight n volume percent of solutn is 22 n 44 find density

Answer»

ANSWER:

DENSITY = Mass/Volume

Density = 22/44

=1/2

= 0.5

Discussion

24.	Which among the following are endothermic or exothermic(a) decomposition of ferrous sulphate(b) dilution of sulphuric acid(c) dissolution of sodium hydroxide in water(d) dissolution of ammonium chloride in water
Answer» a) exothermic b)endothermic c)endothermic d) exothermic mark me as BRAINILEST ANSWER

24.

Which among the following are endothermic or exothermic(a) decomposition of ferrous sulphate(b) dilution of sulphuric acid(c) dissolution of sodium hydroxide in water(d) dissolution of ammonium chloride in water

Answer»

a) exothermic

b)endothermic

c)endothermic

d) exothermic

mark me as BRAINILEST ANSWER

Discussion

25.	A metal used to make automobile batteries
Answer» Answer: PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? Explanation: Some of the most common TYPES of SECONDARY batteries with metals used in them include : ... b) Lead–ACID : This BATTERY makes use of lead and sulfuric acid and is one of the oldest battery type with common application in car engines. c) NiMH : The metal under use is just Nickel, with hydrogen acting as anode. PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ? PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ?

25.

A metal used to make automobile batteries

Answer»

Answer:

PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ?

Explanation:

Some of the most common TYPES of SECONDARY batteries with metals used in them include : ... b) Lead–ACID : This BATTERY makes use of lead and sulfuric acid and is one of the oldest battery type with common application in car engines. c) NiMH : The metal under use is just Nickel, with hydrogen acting as anode.

PLEAZE....MARK IT AS THE BRAINLIEST ANSWER!? ?

Discussion

26.	Are the cathode rays a stream of electrons and anode rays a stream of protons
Answer» Hi there, ☆ Cathode RAYS are negative CHARGE particals (electrons) ☆ ANODE rays are positive charge paricals ( cations) ☆《Both broduced when gas in discharge tube under low pressure and high voltage ☆ Cations are differs according to atomic mass of the gas so its not protons ☆ Anode rays are protons if the gas is hydrogen ♡ Hope the ANSWER is helpful ♡ Plz mark it as BRAINLIEST

26.

Are the cathode rays a stream of electrons and anode rays a stream of protons

Answer»

Hi there,

☆ Cathode RAYS are negative CHARGE particals (electrons)

☆ ANODE rays are positive charge paricals ( cations)

☆《Both broduced when gas in discharge tube under low pressure and high voltage

☆ Cations are differs according to atomic mass of the gas so its not protons

☆ Anode rays are protons if the gas is hydrogen

♡ Hope the ANSWER is helpful

♡ Plz mark it as BRAINLIEST

Discussion

27.	Name 20compounds along with their chemical formulae and colour
Answer» H2O water SO3 sulphur trioxide CCl4 carbontertachloride CO2 carbon dioxide H2SO4 SULPHURIC acid NO nitrogen monoxide CO carbon monoxide HNO3 NITRIC acid C2H5OH ethanol C2H2 ethyne CH4 methane C6H6 benzene HCOH formaldehyde

Discussion

28.	Write a short note on BEC
Answer» ANSWER: Your answer is in PICTURES

28.

Write a short note on BEC

Answer»

ANSWER:

Your answer is in PICTURES

Discussion

29.	Which+chemical+present+in+pollutants+
Answer» Answer: OZONE,CO,lead,OXIDES of nitrogen, SO2

29.

Which+chemical+present+in+pollutants+

Answer»

Answer:

OZONE,CO,lead,OXIDES of nitrogen, SO2

Discussion

30.	How does the movement of the diaphragm causes the air to go in and out of the lungs
Answer» Answer:- because diaphagram is falxible in NATURE .when daiphagram EXPAND then air GO out from the lungs and when DIAPHRAGM contract air come in to the lungs.. that's why due to diaphragm MOVEMENT air go in and out of the lungs...

30.

How does the movement of the diaphragm causes the air to go in and out of the lungs

Answer»

Answer:-

because diaphagram is falxible in NATURE .when daiphagram EXPAND then air GO out from the lungs and when DIAPHRAGM contract air come in to the lungs.. that's why due to diaphragm MOVEMENT air go in and out of the lungs...

Discussion

31.	The merging of a free electron and a hole is called
Answer» Answer: The MERGING of a free electron and a HOLE is called. A. COVALENT bonding. Lifetime. RECOMBINATION

31.

The merging of a free electron and a hole is called

Answer»

Answer:

The MERGING of a free electron and a HOLE is called. A. COVALENT bonding. Lifetime. RECOMBINATION

Discussion

32.	Roll of acetic acid in limit test for heavy metals
Answer» Answer: LIMIT Test of HEAVY Metals ... ADJUST the PH between 3 to 4 by adding dilute acetic acid ' Sp' or dilute ammonia SOLUTION 'Sp', Adjust the pH

32.

Roll of acetic acid in limit test for heavy metals

Answer»

Answer:

LIMIT Test of HEAVY Metals ... ADJUST the PH between 3 to 4 by adding dilute acetic acid ' Sp' or dilute ammonia SOLUTION 'Sp', Adjust the pH

Discussion

33.	prepare a project report on various sample of : a) A mixture b) A compound c) An element (metal and non metal)
Answer» Different types of substances and divided into elements compounds and mixture based on their composition. Explanation: The element is a type of PURE material CONTAINING only one type of substance. the elements can be divided into metals and nonmetals. The atoms either gain or lose electron to gain stability. As a result of this those atoms which lose electron to become stable are known as metals example: iron, and those elements which gain electron to become stable are known as nonmetals example:oxygen. A compound is a pure substance of two or more ION in which there is chemical bond between the two types of ion. A compound can be divided into ionic compound ,covalent compound and co-ordinate covalent compound. A mixture is a collection or of two or more substances between which there is no chemical bond. A mixture can be homogeneous and heterogeneous. In case of homogenous mixture, the composition of the substance remains same all throughout the the mixture whereas in case of heterogeneous mixture the composition varies. To know more about elements and compounds, CLASSIFY the following substances into elements and compounds ... brainly.in/question/5045670 Give 4-5 DIFFERENCE between Elements and Compounds - Brainly.in brainly.in/question/6007033

33.

prepare a project report on various sample of : a) A mixture b) A compound c) An element (metal and non metal)

Answer»

Different types of substances and divided into elements compounds and mixture based on their composition.

Explanation:

The element is a type of PURE material CONTAINING only one type of substance. the elements can be divided into metals and nonmetals. The atoms either gain or lose electron to gain stability. As a result of this those atoms which lose electron to become stable are known as metals example: iron, and those elements which gain electron to become stable are known as nonmetals example:oxygen.

A compound is a pure substance of two or more ION in which there is chemical bond between the two types of ion. A compound can be divided into ionic compound ,covalent compound and co-ordinate covalent compound.

A mixture is a collection or of two or more substances between which there is no chemical bond. A mixture can be homogeneous and heterogeneous. In case of homogenous mixture, the composition of the substance remains same all throughout the the mixture whereas in case of heterogeneous mixture the composition varies.

To know more about elements and compounds,

CLASSIFY the following substances into elements and compounds ...

brainly.in/question/5045670

Give 4-5 DIFFERENCE between Elements and Compounds - Brainly.in

brainly.in/question/6007033

Discussion

34.	prepare a project report on various sample of :a) A mixture b) A compound c) An element ( metal and non metal)
Answer» $\huge\bold{HEY:)-}$ ⭐⭐⭐⭐⭐⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ❤❤❤⭐⭐⭐⭐ $\\ \\ \\ \\ \\$ ⤵⤵⤵⤵ FOLLOW , BRAINLIST ME☺☺PLZZ =========== Metals APPEAR lustrous (BENEATH any patina); form mixtures (alloys) when combined with other metals; tend to lose or share electrons when they REACT with other SUBSTANCES; and each forms at least one predominantly basic oxide.

34.

prepare a project report on various sample of :a) A mixture b) A compound c) An element ( metal and non metal)

Answer»

$\huge\bold{HEY:)-}$

⭐⭐⭐⭐⭐⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ❤❤❤⭐⭐⭐⭐ $\\ \\ \\ \\ \\$

⤵⤵⤵⤵

FOLLOW , BRAINLIST ME☺☺PLZZ

===========

Metals APPEAR lustrous (BENEATH any patina); form mixtures (alloys) when combined with other metals; tend to lose or share electrons when they REACT with other SUBSTANCES; and each forms at least one predominantly basic oxide.

Discussion

35.	Calcium oxide is dissolved in water to produce a compound X. This comp--ound X reacts with carbon dioxide to give another compound Y which isused forwhite washing. Identify X and Y. Also write the chemical reactioninvolved.
Answer» ANSWER: Explanation: X COMPOUND is calcium HYDROXIDE Ca(OH)2 . Y compound is calcium CARBONATE CaCO3. EQUATION: Ca(OH)2 +CO2= CaCO3+H2O

35.

Calcium oxide is dissolved in water to produce a compound X. This comp--ound X reacts with carbon dioxide to give another compound Y which isused forwhite washing. Identify X and Y. Also write the chemical reactioninvolved.

Answer»

ANSWER:

Explanation:

X COMPOUND is calcium HYDROXIDE Ca(OH)2 .

Y compound is calcium CARBONATE CaCO3.

EQUATION:

Ca(OH)2 +CO2= CaCO3+H2O

Discussion

36.	What are the advantages of base?
Answer» ANSWER: I don't answer Explanation: It's too MUCH EASY

36.

What are the advantages of base?

Answer»

ANSWER:

I don't answer

Explanation:

It's too MUCH EASY

Discussion

37.	Que8) Which has the highest freezing point?(a) 1M glucose (b) 1M NaCl (c) 1M CaCl2 (d) 1M AlF3
Answer» ANSWER: (C)1M CACL2. ............

37.

Que8) Which has the highest freezing point?(a) 1M glucose (b) 1M NaCl (c) 1M CaCl2 (d) 1M AlF3

Answer»

ANSWER:

(C)1M CACL2. ............

Discussion

38.	Certain plastic item are called Unbreakable what is this material write its formula
Answer» Answer: those PLASTICS are CALLED as thermosetting plastics. they are MADE by cross-linked POLYMERS.

38.

Certain plastic item are called Unbreakable what is this material write its formula

Answer»

Answer:

those PLASTICS are CALLED as thermosetting plastics. they are MADE by cross-linked POLYMERS.

Discussion

39.	Phosphate solubilization test pgpr actinomycetes pseudomonas
Answer» EXPLANATION: There is a broad spectrum of MINERAL phosphate chemistries; but in arid to SEMIARID SOILS the predominant forms are the calcium phosphates. Calcium phosphates are soluble to varying degrees in the presence of the wide ARRAY of organic acids produced by microorganisms.

39.

Phosphate solubilization test pgpr actinomycetes pseudomonas

Answer»

EXPLANATION:

There is a broad spectrum of MINERAL phosphate chemistries; but in arid to SEMIARID SOILS the predominant forms are the calcium phosphates. Calcium phosphates are soluble to varying degrees in the presence of the wide ARRAY of organic acids produced by microorganisms.

Discussion

40.	On the basis of bohrs model the approximate radius of lithium ion
Answer» EXPLANATION: RADIUS of LITHIUM ION = 0.529 *1/3 = 0.176 A° APPROX

40.

On the basis of bohrs model the approximate radius of lithium ion

Answer»

EXPLANATION:

RADIUS of LITHIUM ION = 0.529 *1/3

= 0.176 A° APPROX

Discussion

41.	Mass percent of different element present in na2so4
Answer» Here is ur ANSWER... HOPE it HELPS... PLZ MARK me as brainliest...

41.

Mass percent of different element present in na2so4

Answer»

Here is ur ANSWER...

HOPE it HELPS...

PLZ MARK me as brainliest...

Discussion

42.	a solution of substance X is used for testing carbon dioxide identify X what will be its reaction with carbon dioxide write a balanced equation for the reaction
Answer» Hi there, ♡ Welcome to brainly family ☆《 X 》is calcium hydroxide [CA(OH)2] ☆ And its COMMON name is LIME water ☆ When its react with carbon dioxide it turns milky ( white precipitate ) So, lime water used as CO2 detector ♡ Hope the answer is helpful ♡ Plz mark it as brainliest

42.

a solution of substance X is used for testing carbon dioxide identify X what will be its reaction with carbon dioxide write a balanced equation for the reaction

Answer»

Hi there,

♡ Welcome to brainly family

☆《 X 》is calcium hydroxide [CA(OH)2]

☆ And its COMMON name is LIME water

☆ When its react with carbon dioxide it turns milky ( white precipitate )

So, lime water used as CO2 detector

♡ Hope the answer is helpful

♡ Plz mark it as brainliest

Discussion

43.	19. Proper increasing order of acidity isA) HCI> HI> HBr> HFC) HI> HBr> HCI> HFB) HF> HCI> HBr> HID) HBr> HI> HCI> HF
Answer» heyya MATE following is your ANSWER.. C) HI>HBR >HCl>HF... hope it helps

43.

19. Proper increasing order of acidity isA) HCI> HI> HBr> HFC) HI> HBr> HCI> HFB) HF> HCI> HBr> HID) HBr> HI> HCI> HF

Answer»

heyya MATE following is your ANSWER..

C) HI>HBR >HCl>HF...

hope it helps

Discussion

44.	10 facts of chemistry
Answer» Explanation: The only solid elements that assume liquid form at room temperature are bromine and mercury. However, you can melt gallium by holding a lump in the warmth of your hand. Unlike many substances, WATER expands as it freezes. An ice cube takes up about 9% more volume than the water used to make it. If you pour a handful of salt into a full glass of water, the water level will actually go down rather than overflowing the glass. Similarly, if you mix half a liter of ALCOHOL and half a liter of water, the total volume of the liquid will be less than one liter. There is about 1/2 lb or 250 g of salt (NaCl) in the average adult human body. A pure element takes many forms. For example, diamond and GRAPHITE both are forms of pure carbon. Many radioactive elements actually glow in the dark. The chemical name for water (H2O) is dihydrogen monoxide. The only letter not appearing on the periodic table is J. Lightning strikes produce O3, which is ozone, and strengthen the ozone layer of the atmosphere. The only two non-silvery metals are gold and copper. Although oxygen gas is COLORLESS, the liquid and solid forms of oxygen are blue.

44.

10 facts of chemistry

Answer»

Explanation:

The only solid elements that assume liquid form at room temperature are bromine and mercury. However, you can melt gallium by holding a lump in the warmth of your hand.

Unlike many substances, WATER expands as it freezes. An ice cube takes up about 9% more volume than the water used to make it.

If you pour a handful of salt into a full glass of water, the water level will actually go down rather than overflowing the glass.

Similarly, if you mix half a liter of ALCOHOL and half a liter of water, the total volume of the liquid will be less than one liter.

There is about 1/2 lb or 250 g of salt (NaCl) in the average adult human body.

A pure element takes many forms. For example, diamond and GRAPHITE both are forms of pure carbon.

Many radioactive elements actually glow in the dark.

The chemical name for water (H2O) is dihydrogen monoxide.

The only letter not appearing on the periodic table is J.

Lightning strikes produce O3, which is ozone, and strengthen the ozone layer of the atmosphere.

The only two non-silvery metals are gold and copper.

Although oxygen gas is COLORLESS, the liquid and solid forms of oxygen are blue.

Discussion

45.	Is egg an acidic and cheese a basic substance??
Answer» ANSWER: egg is MADE up of calcium CARBONATE so it may be BASIC in nature

45.

Is egg an acidic and cheese a basic substance??

Answer»

ANSWER:

egg is MADE up of calcium CARBONATE so it may be BASIC in nature

Discussion

46.	Sodium reacts with water to form sodium hydroxide and hydroxide
Answer» MARK my answer as the brainliest PLS... I need 1 brainiest answer to ACHIEVE expert RANK

46.

Sodium reacts with water to form sodium hydroxide and hydroxide

Answer»

MARK my answer as the brainliest PLS...

I need 1 brainiest answer to ACHIEVE expert RANK

Discussion

47.	In which state of matter do the constituent particles have the minimum energy? Justify.
Answer» ANSWER: solid Explanation: in solid because kinetick ENERGY is least in solods and its PARTICLES hardly MOVES from there place and VIBRATE

47.

In which state of matter do the constituent particles have the minimum energy? Justify.

Answer»

ANSWER:

solid

Explanation:

in solid because kinetick ENERGY is least in solods and its PARTICLES hardly MOVES from there place and VIBRATE

Discussion

48.	What are the half reactions for electroplating of copper on iron?
Answer» Answer: When the iron NAIL is connected to negative terminal it is known as cathode and copper metal is connected to positive terminal it is known as anode. At the anode : copper metal dissolves to form CU2+ ions. It will be presented in this HALF EQUATION: Cu gives Cu2+ + 2e. HOPE IT'S HELPFUL........... Plzz MARK AS BRAINLIST............... Explanation:

48.

What are the half reactions for electroplating of copper on iron?

Answer»

Answer:

When the iron NAIL is connected to negative terminal it is known as cathode and copper metal is connected to positive terminal it is known as anode. At the anode : copper metal dissolves to form CU2+ ions. It will be presented in this HALF EQUATION: Cu gives Cu2+ + 2e.

HOPE IT'S HELPFUL...........

Plzz MARK AS BRAINLIST...............

Explanation:

Discussion

49.	On an a-4 pastel sheet write the two laws of chemical combination
Answer» ANSWER: OH where can I buy a a 4 PASTEL sheet

49.

On an a-4 pastel sheet write the two laws of chemical combination

Answer»

ANSWER:

OH where can I buy a a 4 PASTEL sheet

Discussion

50.	Oil and fat containing food items are flushed with nitrogen, why?
Answer» EXPLANATION: oil and FAT containing FOOD items flushed with NITROGEN because nitrogen ACTS as an antioxidant and it prevent them from being oxidised.

50.

Oil and fat containing food items are flushed with nitrogen, why?

Answer»

EXPLANATION:

oil and FAT containing FOOD items flushed with NITROGEN because nitrogen ACTS as an antioxidant and it prevent them from being oxidised.

Discussion

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Explanation:

On an a-4 pastel sheet write the two laws of chemical combination

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