52639 + Interview Questions in Secondary School in Chemistry

1.	Sodium carbonate solution on reaction with hydrochloric acid to give sodium chloride and sodium hydrogen carbonate
Answer» YES PLZZZZZZ WRITE the?

Discussion

2.	Derive the formula of Magnesium sulphate
Answer» MGSO4 FOMULA OF MAGNESIUM SULPHATE

Discussion

3.	What is a good process of separating mud and water
Answer» CENTRIFUGATION PROCESS

Discussion

4.	The product of the following reaction : CH2 = CH – CCl3 + HBr(a) CH3 – CH(Br) – CCl3 (b) CH2(Br) – CH2 – CCl3 (c) BrCH2 – CHCl – CHCl2 (d) CH3 – CH2 – CCl3
Answer» Answer: The correct answer is (a). EXPLANATION: $CH_2=CH-CCl_3 +\overset{HBr}\rightarrow CH_3-CH(Br)-CCl_3$ Given REACTION is in the PRESENCE of hydrogen bromide which means that addition of proton and bromide ion will take place in ACCORDANCE with Markovnikov's rule. That is proton from HBr will get bonded to the carbon atom where more number hydrogen atoms are present and bromide ion will get bonded to stable carbo-cation. Markovnikov's rule states that during addition reaction in ALKENES, stable carbo-cation will form and proton will get attached to that carbon atom which have more number of hydrogen atoms. Hence,the correct answer is (a).

4.

The product of the following reaction : CH2 = CH – CCl3 + HBr(a) CH3 – CH(Br) – CCl3 (b) CH2(Br) – CH2 – CCl3 (c) BrCH2 – CHCl – CHCl2 (d) CH3 – CH2 – CCl3

Answer»

Answer: The correct answer is (a).

EXPLANATION:

$CH_2=CH-CCl_3 +\overset{HBr}\rightarrow CH_3-CH(Br)-CCl_3$

Given REACTION is in the PRESENCE of hydrogen bromide which means that addition of proton and bromide ion will take place in ACCORDANCE with Markovnikov's rule. That is proton from HBr will get bonded to the carbon atom where more number hydrogen atoms are present and bromide ion will get bonded to stable carbo-cation.

Markovnikov's rule states that during addition reaction in ALKENES, stable carbo-cation will form and proton will get attached to that carbon atom which have more number of hydrogen atoms.

Hence,the correct answer is (a).

Discussion

5.	Chlorophenyl methane
Answer» The FORMULA of chlorophenyl METHANE is C9H13Cl3

Discussion

6.	Class 10 chemistry chapter:- chemical reaction and equations
Answer» Hey mate here is your answer : (1).The metal M is SILVER ( Ag ) and the gas X2 is Chlorine (CL2). (2). The chemical reaction involved is $decomposition \: reaction.$ Equation : AgCl2 = Ag + Cl2 Hope you LIKE it please mark as brainliest.

Discussion

7.	Give a reaction which shows that water contain hydrogen
Answer» H + O2 =H2O.................

Discussion

8.	Help out please......
Answer» Here is your ANSWER GLAD YOU LIKE IT PLEASE NOTE MY ANSWER AS BRAINLIEST

Discussion

9.	Find the number of atom of potassium present in 117 gram
Answer» The number of atoms of potassium PRESENT in 117 grams of K K is equal to 39

Discussion

10.	Which technique can be used for purification of iodine that contains traces of NaCl?
Answer» IODINE can be separated from sodium chloride by sublimation. Iodine sublimes and its vapour can be condensed on a COLD SURFACE whereas sodium chloride is left behind. MARK AS BRAINLIEST AND also RATE it well

10.

Which technique can be used for purification of iodine that contains traces of NaCl?

Answer»

IODINE can be separated from sodium chloride by sublimation. Iodine sublimes and its vapour can be condensed on a COLD SURFACE whereas sodium chloride is left behind.

MARK AS BRAINLIEST

AND also RATE it well

Discussion

11.	Please help........................
Answer» Here is your ANSWER \| answer is OPTION - D GLAD YOU LIKE IT PLEASE NOTE MY ANSWER AS BRAINLIEST

Discussion

12.	Write the information about any 4 carbon compounds.
Answer» HEYAAA,,,,, HERE IS YOUR ANSWER DEAR....:) 4 carbon compounds : FOUR CARBON COMPOUNDS ARE: 1. Carbohydrates monosaccarides, disaccarides, olgiosaccarides and POLY saccarides. Hydrophillic. (CnH2O)n 2. Disaccarides sucrose lactose malatose 3. Lipids hydrophobic, organic. It has 5 main types. 4. Monosaccarides glucose, galatose, fructose HOPES ITS HELPFUL... MARK ME BRAINLIEST PLZ.... :)

12.

Write the information about any 4 carbon compounds.

Answer»

HEYAAA,,,,,

HERE IS YOUR ANSWER DEAR....:)

4 carbon compounds :

FOUR CARBON COMPOUNDS ARE:

1. Carbohydrates

monosaccarides, disaccarides, olgiosaccarides and POLY saccarides. Hydrophillic. (CnH2O)n

2. Disaccarides

sucrose lactose malatose

3. Lipids

hydrophobic, organic. It has 5 main types.

4. Monosaccarides

glucose, galatose, fructose

HOPES ITS HELPFUL...

MARK ME BRAINLIEST PLZ....

:)

Discussion

13.	calculate the mass of water which contain the same number of molecules as a contained in 60 gram of oxygen
Answer» Here is your ANSWER GLAD YOU LIKE IT PLEASE NOTE MY ANSWER AS BRAINLIEST

Discussion

14.	What part of electromagnetic spectrum does balmer series belong?
Answer» VISIBLE REGION of ELECTROMAGNETIC SPECTRUM

Discussion

15.	What is the formula for the compound formed by calcium and nitrogen
Answer» (D) is the CORRECT OPTION.

Discussion

16.	Which gas is evolved when copper is treated with dilute HNO3?
Answer» NITROGEN DIOXIDE (NO2) is RELEASED

Discussion

17.	The number of molecules in 22.4 cm cube of Nitrogen gas at STP is
Answer» 1metre CUBE= 1000litres or,1 LITRE = 10^-3 METRE cube=10^3 CENTIMETRE cube. NOW,here 22.4litres of nitrogen gas at STP = 6.022 ×10^23 molecules of nitrogen gas or,22.4×10^3 centimetre cube of nitrogen gas at STP= 6.022×10^23 molecules of nitrogen gas or,1 centimetre cube of nitrogen gas at STP= 6.022×10^23/22.4×10^3 molecules of nitrogen gas or,22.4centimetre cube of nitrogen gas at STP= 6.022×10^23×22.4/22.4×10^3 molecules of nitrogen gas = 6.022×10^20 molecules of nitrogen gas

Discussion

18.	Help please.................
Answer» 0.8 Mole hope it HELPS you

Discussion

19.	Help out....................
Answer» The ANSWER is 21 MOLES

Discussion

20.	Periodic table of elements first 30 with atomic weights valency and charge
Answer» HEYAAAA,,,, The First 30 Elements: Element-Symbol-Atomic number-Atomic mass-Valency Hydrogen-H(symbol)-1(Atomic number)-1(Atomic mass)-1(Valency) Helium-He-2-4-0 Lithium-Li-3-7-1 Beryllium-Be4-9-2 Boron-B-5-11-3 Carbon-C-6-12-4 Nitrogen-N-7-14-3 Oxygen-O-8-16-2 Fluorine-F-9-19-1 Neon-Ne-10-20-0 Sodium-Na-11-23-1 Magnesium-Mg-12-24-2 Aluminum-Al-13-27-3 Silicon-Si-14-28-4 Phosphorus-P-15-31-3 Sulphur-S-16-32-2 Chlorine-Cl-17-35.5-1 Argon-Ar-18-40-0 Potassium-K-19-39-1 Calcium-Ca-20-40-2 Scandium-Sc-21-44-3 Titanium-Ti-22-48-4 Vanadium-V-23-51 Chromium-Cr-24-52 Manganese-Mn-25-55 Iron-Fe-26-56 Cobalt-Co-27-59 Nickel-Ni-28-58 Copper-Cu-29-63.5 Zinc-Zn-30-65 ,....... Valencies are variable for elements 23-30 HOPES ITS HELPFUL... MARK ME BRAINLIEST PLZ:) GLAD TO HELP U...:)

20.

Periodic table of elements first 30 with atomic weights valency and charge

Answer»

HEYAAAA,,,,

The First 30 Elements:

Element-Symbol-Atomic number-Atomic mass-Valency

Hydrogen-H(symbol)-1(Atomic number)-1(Atomic mass)-1(Valency)

Helium-He-2-4-0

Lithium-Li-3-7-1

Beryllium-Be4-9-2

Boron-B-5-11-3

Carbon-C-6-12-4

Nitrogen-N-7-14-3

Oxygen-O-8-16-2

Fluorine-F-9-19-1

Neon-Ne-10-20-0

Sodium-Na-11-23-1

Magnesium-Mg-12-24-2

Aluminum-Al-13-27-3

Silicon-Si-14-28-4

Phosphorus-P-15-31-3

Sulphur-S-16-32-2

Chlorine-Cl-17-35.5-1

Argon-Ar-18-40-0

Potassium-K-19-39-1

Calcium-Ca-20-40-2

Scandium-Sc-21-44-3

Titanium-Ti-22-48-4

Vanadium-V-23-51

Chromium-Cr-24-52

Manganese-Mn-25-55

Iron-Fe-26-56

Cobalt-Co-27-59

Nickel-Ni-28-58

Copper-Cu-29-63.5

Zinc-Zn-30-65

,....... Valencies are variable for elements 23-30

HOPES ITS HELPFUL...

MARK ME BRAINLIEST PLZ:)

GLAD TO HELP U...:)

Discussion

21.	How is tooth decay related to ph
Answer» The lower the pH, the higher the acidity, and the higher the pH, the higher the alkaline levels. ... While we KNOW that sugar feeds the BACTERIA that produces acids and turns into cavities, it is actually PROLONGED ACIDIC oral pH that can cause tooth decay and a demineralization of your ENAMEL.

Discussion

22.	Daltons law of partial pressure is not applicable to
Answer» $\huge\green{Hello there}$ _____________ $\huge\pink{DALTON'S LAW OF PARTIAL PRESSURE }$ It states that The TOTAL pressure is EQUAL to partial pressure of INDIVIDUAL gases (non REACTING gases). $\huge\brown{DALTON'S LAW IS NOT APPLICABLE TO }$ 1▪ It is not applicable to liquids 2▪ It is not applicable to individual gas 3▪ It is not applicable to reacting gases ______________ $\huge\red{INSHALLAH IT WILL HELP U}$

Discussion

23.	What are isotopes and give an example and explain in details
Answer» Isotopes are atoms of same element having same atomic number but DIFFERENT MASS number. The atoms have same number of PROTONS but different number of neutrons. For e.g. Chlorine Atomic no = 17 ( 2, 8, 7) Isotopes Chlorine-35 Chlorine-37 Hope this helps....

Discussion

24.	Structural formula of the following(1).2 carbamoyl cyclo butane 1 carboxylic acid(2).2 methyl propane 2 ol
Answer» Explanation: Structural formula of a molecules tells us about the NUMBER of atoms and POSITION of the atoms in MOLECULE of that COMPOUND. 1) 2-carbamoyl cyclobutane-1-carboxylic acid Structural formula of GIVEN compound as shown in the image attached. $(NH_2-CO-)-C_4H_6-(COOH)$ (2).2-methyl propane-2-ol Structural formula of given compound is : $CH_3-C(OH)(CH_3)-CH_3$

24.

Structural formula of the following(1).2 carbamoyl cyclo butane 1 carboxylic acid(2).2 methyl propane 2 ol

Answer»

Explanation:

Structural formula of a molecules tells us about the NUMBER of atoms and POSITION of the atoms in MOLECULE of that COMPOUND.

1) 2-carbamoyl cyclobutane-1-carboxylic acid

Structural formula of GIVEN compound as shown in the image attached.

$(NH_2-CO-)-C_4H_6-(COOH)$

(2).2-methyl propane-2-ol

Structural formula of given compound is : $CH_3-C(OH)(CH_3)-CH_3$

Discussion

25.	10 examples of true solution in daily life
Answer» Here is your answer.... ______________________ ✔ SUGAR in water ✔ Common SALT in water ✔ ACETIC acid in water ✔ lemonade ✔Soda water ✔Vinegar ✔Filtered Tea ✔ Juice ✔Soft drinks ✔Copper sulphate solution _________________________ Hope this HELPS you......

Discussion

26.	Day by day use of electroplating?
Answer» Electroplating is used to COAT a surface with a thin layer of metal through electrochemical processes. As students, we MAY remember such demonstrations from SCIENCE class, in which electroplating was used to illustrate the chemical principles underlying the PROCESS, but the technique has many PRACTICAL applications.. .. make me brain list and follow

Discussion

27.	Why do HCl gas do not change the colour of blue litmus though it is an acid
Answer» HCl has is not ACIDIC it needs H2O to dissociate HCl into H(+) and Cl(-). DUE to this reason it doesn't change the COLOR of blue litmus. Here is your ANSWER GLAD YOU LIKE IT PELASE NOTE MY ANSWER AS BRAINLIEST

Discussion

28.	Oxidation number of oxygen is +2 in oxygen difluroide give reason
Answer» Oxygen TAKES such OXIDATION number to MAKE the COMPOUND neutral Here is your answer GLAD YOU LIKE IT PLEASE NOTE MY ANSWER AS BRAINLIEST

Discussion

29.	5 a molecule, z, contains two atoms of oxygen, six atoms of hydrogen and three atoms of carbon. What is the formula of z?
Answer» Hello BRO haping that i helped you my FRIEND if having doubt you can ask me

Discussion

30.	Is 3f sub shell is allowed in an atom ?justify your answer
Answer» $\huge\green{Hello there}$ __________ Electronic configuration is given as :- 1s2 , 2S2, 2p6 3s2 , 3p6 , 3d10 4s2 , 4p6, 4D10 , 4f14 5S2, 5p6 , 5D10 , 5f14 SO .......... 3f subshell is not allowed I mean it isn't there . _________________ $\huge\red{INSHALLAH IT WILL HELP U }$

Discussion

31.	Examples for halides
Answer» HELLO mate ANSWER is Fluorine, CHLORINE ,Bromine, Iodine please mark as BRAINLILIST

Discussion

32.	Name the type of potential difference produced between the phase recharge layer and diffuse layer having opposite charge around the colloidal particle
Answer» Elecrokinetic POTENTIAL or ZETA potential

Discussion

33.	Why are lithium sodium and potassium called alkali metals give reaction
Answer» These metals are present in the FIRST group of the periodic table which consists of alkali metals . These elements lose electrons very easily and form +1 ION. They react very vigorously with WATER and form HYDROGEN gas and hydroxide ion.

Discussion

34.	4nh3+5o2=4no+6h2o which is an oxidising agent and which is a reducing agent
Answer» OXIDISING AGENT - 4nh3 reducing agent - 5O2

Discussion

35.	What are Halides? Can anybody explain it
Answer» HEY, here is your answer A binary compound of a HALOGEN with another element or GROUP is called Halides. Hope it helps you

Discussion

36.	When destructive distillation of coal is done, the non volatile residue left ?a.coke b.anthracite c.coal gas d.coke
Answer» HEY mate Hope its correct The ANSWER is COKE OK

36.

When destructive distillation of coal is done, the non volatile residue left ?a.coke b.anthracite c.coal gas d.coke

Answer»

HEY mate

Hope its correct

The ANSWER is COKE

OK

Discussion

37.	Calculate the concentration of a solution containing 23g of NaCl in 250g of water
Answer» Molality-? GIVEN mass of solvent = 250 g given mass of SOLUTE = 23g no. of MOLES = 23g/Molar mass of NaCL Molality =No. of moles of solute×1000/ Mass of solvent in kg Further solving will give you the RESULT.

Discussion

38.	Which shows anamalous expansion
Answer» HIYA ! HERE'S THE ANSWER ..... when water is cooled from room temperature , it first contracts in VOLUME and becomes increasingly dense as other LIQUIDS do ...........this freezing goes until water reaches 0oC i.e it becomes ice ... ----------------- The anomalous expansion of water is an abnormal property of water whereby it expands INSTEAD of contracting when the temperature goes from 4OC to 0oC, and it becomes less dense. The density becomes less and less as it freezes because molecules of water normally FORM open crystal structures when in solid form

38.

Which shows anamalous expansion

Answer»

HIYA !

HERE'S THE ANSWER .....

when water is cooled from room temperature , it first contracts in VOLUME and becomes increasingly dense as other LIQUIDS do ...........this freezing goes until water reaches 0oC i.e it becomes ice ...

-----------------

The anomalous expansion of water is an abnormal property of water whereby it expands INSTEAD of contracting when the temperature goes from 4OC to 0oC, and it becomes less dense. The density becomes less and less as it freezes because molecules of water normally FORM open crystal structures when in solid form

Discussion

39.	Name the heaviest solid metal ?
Answer» OSMIUM is the HEAVIEST SOLID METAL

Discussion

40.	Name of fourth and fifth member of homologous series of acetic acid
Answer» So, if we put n = 4 in the general FORMULA CnH2n +1OH then the molecular formula of the fourth MEMBER of the homologous SERIES will BECOME C4H2 * 4 + 1OH or C4H9OH. So, if we put n = 5 in the general formula CnH2n + 1OH, then the molecular formula of the fifth member of the alcohol series will become C5H2 * 5 + 1OH or C5H11OH.So, if we put n = 5 in the general formula CnH2n + 1OH, then the molecular formula of the fifth member of the alcohol series will become C5H2 * 5 + 1OH or C5H11OH.

40.

Name of fourth and fifth member of homologous series of acetic acid

Answer»

So, if we put n = 4 in the general FORMULA CnH2n +1OH then the molecular formula of the fourth MEMBER of the homologous SERIES will BECOME C4H2 * 4 + 1OH or C4H9OH.

So, if we put n = 5 in the general formula CnH2n + 1OH, then the molecular formula of the fifth member of the alcohol series will become C5H2 * 5 + 1OH or C5H11OH.So, if we put n = 5 in the general formula CnH2n + 1OH, then the molecular formula of the fifth member of the alcohol series will become C5H2 * 5 + 1OH or C5H11OH.

Discussion

41.	Name of salt produced by hydrochloric acid reacts with calcium hydroxide
Answer» HCl+CaOH= CaCl+H2O. HOPE it HELPS

Discussion

42.	Why does adding salt increase the boiling point of water??
Answer» The WATER molecules need more energy to produce more pressure to escape the boiling POINT .Thus when salt is ADDED to water the boiling point of water increases if you have any DOUBT PLEASE ask

Discussion

43.	IUPAC name of the following compound
Answer» KAUN SA wala solve karna HAI

Discussion

44.	Which is the oxidizing Agent,substamce oxidized,Reducing Agent,Substance reduced in (4Fe+3O2---------2Fe2O3).
Answer» Oxidising AGENT is OXYGEN substance oxidised is FERROUS oxide

Discussion

45.	Two characterstatics of the compound of an homologous series class 10
Answer» HOLA MATEY :) here's the answer...... ALL THE MEMBERS OF THE HOMOLOGOUS SERIES CONTAIN SAME FUNCTIONAL GROUP AND THEY CAN BE REPRESENTED BY GENERAL FORMULA ALL THE MEMBERS OF THIS SERIES HAVE SAME CHEMICAL PROPERTIES DUE TO SAME FUNCTIONAL GROUP ANY TWO ADJACENT HOMOLOGOUS DIFFER BY ONE CARBON ATOM AND TWO HYDROGEN ATOM IN THEIR FORMULA THEY HAVE THE SAME GENERAL METHOD OF PREPARATION as in :all alkalines can be prepared by the reduction of alkyl halides { CnH₂n₊₁₋₋X}} WISH THIS WILL HELP YOU #_#

45.

Two characterstatics of the compound of an homologous series class 10

Answer»

HOLA MATEY :)

here's the answer......

ALL THE MEMBERS OF THE HOMOLOGOUS SERIES CONTAIN SAME FUNCTIONAL GROUP AND THEY CAN BE REPRESENTED BY GENERAL FORMULA

ALL THE MEMBERS OF THIS SERIES HAVE SAME CHEMICAL PROPERTIES DUE TO SAME FUNCTIONAL GROUP

ANY TWO ADJACENT HOMOLOGOUS DIFFER BY ONE CARBON ATOM AND TWO HYDROGEN ATOM IN THEIR FORMULA

THEY HAVE THE SAME GENERAL METHOD OF PREPARATION as in :all alkalines can be prepared by the reduction of alkyl halides { CnH₂n₊₁₋₋X}}

WISH THIS WILL HELP YOU

#_#

Discussion

46.	Calculate mole fraction of HCL in a solution containing 24.8 % of HCL by mass
Answer» Hey dude your answer is!!!!!! ==============÷==================÷======= mole fraction = (MOLES of SOLUTE)/(moles of solute + moles of solvent) So, we have to ALWAYS assume (unless otherwise stated) that we have 100g of total mass. This means that we have 24.8g of HCl. On mol of HCl is 36.45g. So to find moles, we take 24.8/36.45 which gives us .68 moles of HCl. Now, 100-24.8 will give us how much water we have. Since we have 75.2 grams of water, we can now find the total moles of water. 75.2/18(WEIGHT of one mol of water)=4.18 moles. Back to our original equation.. (.68)/(.68+4.18)= about .14. Hope this HELPS you plzz mark as brainliest

Discussion

47.	An alkali metal in period 2 which dissolve in water given a strong alkali
Answer» any metal of GROUP 2 so it is CALLES alkali EARTH METALS

Discussion

48.	Which is the oxidixing agent ,reducing agent ,substance oxidinzed,substance reduced in (Fe+2HCl------FeCl2+H2)
Answer» OXIDISING AGENT cl reducing agent H

Discussion

49.	Sample paper of 9class (sanik school)
Answer» Why are you WRITE a SAMPLE PAPER for 9TH CLASS

Discussion

50.	how much amount of CaCO3 in gram having percentage purity 50% produces 0.56l of CO2 at STP on heating?
Answer» Hey dude your ANSWER is ============================= At STP, any gas has volume 22.4L for 1mol. So, 0.56L of CO2 = 1×0.5622.4=0.025 mol Now, the reaction is: CaCO3 ⇌ CaO+CO2Reaction stoichiometryCompound Coefficient Molar Mass Moles WeightCaCO3 1 100 0.025 2.50CaO 1 56 0.025 1.40CO2 1 44 0.025 1.10 So, the real amount of CaCO3 = 2.5 g But, since the SAMPLE is 50% pure, so actual amount of CaCO3 = 5g Hope it helps you plzz MARK as brainliest

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Sodium carbonate solution on reaction with hydrochloric acid to give sodium chloride and sodium hydrogen carbonate

Derive the formula of Magnesium sulphate

What is a good process of separating mud and water

The product of the following reaction : CH2 = CH – CCl3 + HBr​(a) CH3 – CH(Br) – ​CCl3 (b) CH2(Br) – CH2 – ​CCl3 (c) BrCH2 – CHCl – CHCl2 (d) CH3 – CH2 – CCl3

Chlorophenyl methane

Class 10 chemistry chapter:- chemical reaction and equations

Give a reaction which shows that water contain hydrogen

Help out please......

Find the number of atom of potassium present in 117 gram

Which technique can be used for purification of iodine that contains traces of NaCl?

Please help........................

Write the information about any 4 carbon compounds.

HEYAAA,,,,,

HERE IS YOUR ANSWER DEAR....:)

4 carbon compounds :

FOUR CARBON COMPOUNDS ARE:

1. Carbohydrates

monosaccarides, disaccarides, olgiosaccarides and POLY saccarides. Hydrophillic. (CnH2O)n

2. Disaccarides

sucrose lactose malatose

3. Lipids

hydrophobic, organic. It has 5 main types.

4. Monosaccarides

glucose, galatose, fructose

HOPES ITS HELPFUL...

MARK ME BRAINLIEST PLZ....

:)

calculate the mass of water which contain the same number of molecules as a contained in 60 gram of oxygen

What part of electromagnetic spectrum does balmer series belong?

What is the formula for the compound formed by calcium and nitrogen

Which gas is evolved when copper is treated with dilute HNO3?

The number of molecules in 22.4 cm cube of Nitrogen gas at STP is

Help please.................

Help out....................

Periodic table of elements first 30 with atomic weights valency and charge

HEYAAAA,,,,

The First 30 Elements:

Element-Symbol-Atomic number-Atomic mass-Valency

Hydrogen-H(symbol)-1(Atomic number)-1(Atomic mass)-1(Valency)

Helium-He-2-4-0

Lithium-Li-3-7-1

Beryllium-Be4-9-2

Boron-B-5-11-3

Carbon-C-6-12-4

Nitrogen-N-7-14-3

Oxygen-O-8-16-2

Fluorine-F-9-19-1

Neon-Ne-10-20-0

Sodium-Na-11-23-1

Magnesium-Mg-12-24-2

Aluminum-Al-13-27-3

Silicon-Si-14-28-4

Phosphorus-P-15-31-3

Sulphur-S-16-32-2

Chlorine-Cl-17-35.5-1

Argon-Ar-18-40-0

Potassium-K-19-39-1

Calcium-Ca-20-40-2

Scandium-Sc-21-44-3

Titanium-Ti-22-48-4

Vanadium-V-23-51

Chromium-Cr-24-52

Manganese-Mn-25-55

Iron-Fe-26-56

Cobalt-Co-27-59

Nickel-Ni-28-58

Copper-Cu-29-63.5

Zinc-Zn-30-65

,....... Valencies are variable for elements 23-30

HOPES ITS HELPFUL...

MARK ME BRAINLIEST PLZ:)

GLAD TO HELP U...:)

How is tooth decay related to ph

Daltons law of partial pressure is not applicable to

What are isotopes and give an example and explain in details

Structural formula of the following(1).2 carbamoyl cyclo butane 1 carboxylic acid(2).2 methyl propane 2 ol

10 examples of true solution in daily life

Day by day use of electroplating?

Why do HCl gas do not change the colour of blue litmus though it is an acid

The product of the following reaction : CH2 = CH – CCl3 + HBr(a) CH3 – CH(Br) – CCl3 (b) CH2(Br) – CH2 – CCl3 (c) BrCH2 – CHCl – CHCl2 (d) CH3 – CH2 – CCl3