52639 + Interview Questions in Secondary School in Chemistry

1.	Analyse the statement and given below and correct the wrong statementa)as distance from nucleus increases , energy of shells decreaseb) electron filling in shell occurs in the increasing order of energyc) as distance increases, attraction between nucleus and electron decreasesd) s and p subshells are common in all shells
Answer» ANSWER: d Explanation: s subshell is common to all the shells but not p sub shell as alkali METALS and alkali earth metal last electron entre to s subshell so it is not possible for them to enter in p sub shell as already there last electron had entered to s sub shell yes expect s block ELEMENT in p block and d block and f block p sub shell is common but not in s block as shell STARTS from s,p,d,f so statement d is wrong among other options i.e your answer is ( D) hope it was helpful !!

1.

Analyse the statement and given below and correct the wrong statementa)as distance from nucleus increases , energy of shells decreaseb) electron filling in shell occurs in the increasing order of energyc) as distance increases, attraction between nucleus and electron decreasesd) s and p subshells are common in all shells

Answer»

d

Explanation:

s subshell is common to all the shells but not p sub shell as alkali METALS and alkali earth metal last electron entre to s subshell so it is not possible for them to enter in p sub shell as already there last electron had entered to s sub shell yes expect s block ELEMENT in p block and d block and f block p sub shell is common but not in s block as shell STARTS from s,p,d,f

so statement d is wrong among other options

i.e your answer is ( D)

hope it was helpful !!

5.	2.If magnesium reacts with hydrochloric acid, what gas is produced?A) HydrogenB) carbon dioxideC) oxygenD) chlorine
Answer» if MAGNESIUM REACTS with HYDROCHLORIC acid hydrogen gas is PRODUCED

14.	Which of the following sets of particles represents an ion?A) 19 protons, 19 neutrons, and 19 electronsB) 20 protons, 19 neutrons, and 20 electronsC) 19 protons, 20 neutrons, and 19 electronsD) 19 protons, 19 neutrons, and 18 electrons
Answer» D) 19 PROTONS, 19 NEUTRONS, and 18 ELECTRONS

24.	The Formula Of Sulphate Of Metal a M is M2SO4, Determine The Valancy Of The Metal M And Predict Of It's Dichromate , Carbide , Nitrate And Phosphateplease guys do it fast I have to write it down somewhere and the one who will give correct answer I'll give five star rating and heart and brainliest answer badge so please help me
Answer» VALENCY of METAL is 1 Dichromate M2Cr2O7 ; valency =1 MNO3( NITRATE) valency 1

Explore topic-wise InterviewSolutions in Current Affairs.

(b) Mendeleev's contributions to the concept of periodic table laid the foundation for the Modern Periodic Table. Give reasons.​

Why does Solid have the highest density? Why do Gases exhibit the mostrandom motion among the three state of matter​

//solid are RIGID so they have high DENSITY to maintain their shape

//gas EXHIBIT the most random motion because the the ATTRACTION between PARTICLES is the really low

2.If magnesium reacts with hydrochloric acid, what gas is produced?A) HydrogenB) carbon dioxideC) oxygenD) chlorine​

A. Out of zinc, iron and copper, which metal.candisplace the other two metals from their saltsolutions? Justify your response.​

The subshell electronic configuration of an element is given in two way1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹​which among these is the correct electronic configuration ? give reason.​

Which of the following is the shape of PCl5 moleculea.trigonal pyramidal b.trigonal bipyramidal c.octahydral d.trigonal planar ​

The subshell electronic configuration of an element is given in two way1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹​

Heisenberg's uncertainity principle is given mathematically asAx x A(mv.) To observe minimum uncertainty the value of 'n' must be(A) 1(B) 4(C) 6(D) 3​

3. Balance the following chemical equations.(a) NaOH+H,SO, “Na SO, +1,0(b) KCIO, ”KCI + 0(C) Hg (NO3),+ KI → HgI,+KNO,1​

Calculate the Bond lengthif HCL molecule if it's moment of inertia is 2.71×10 ^-40gcm and reduced is 1.63×10^-24g.​

The uncertainity in position of an electron is where I is the de-Broglie wavelength. The uncertainity in velocity will be4(A)(B) v(C) 3V(D)146

Which of the following sets of particles represents an ion?A) 19 protons, 19 neutrons, and 19 electronsB) 20 protons, 19 neutrons, and 20 electronsC) 19 protons, 20 neutrons, and 19 electronsD) 19 protons, 19 neutrons, and 18 electrons

The de-Broglie wavelength associated with a photo electron varies with frequency (v) of the incident radiation as (2-threshold frequency)Σ(Α) λα(ν) 1/2Σ(Β) λα(ν)1a1(C) λα(D) λα(ν)145

Sodium chloride salt is used for cookingIt is formed when hydoro chloric acid isadded to sodium hydroxide solution aboth of which are corrosive in nature.But sodium chloride is not . Give reasons.​

Heya mates help pls!!!itz CHEMISTRYHey Samir!!I'm a student of ICSE board...​

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According to the temperature of quotient equation decreasing the temperature of 10 degree the rate of reaction becomesa.1/2b.2/3c.1d.2

When temperature of the reaction medium is decreased by 10°C , the rate of reaction becomes ½.

The uncertainity in the position of moving bullet of mass 10 gm is 10-5 m. The uncertainity in its velocity is(A) 5.2 x 10-28m/ sec(B) 3.0 x 10-2828 m/ sec(C) 5.2 x 10-22m/ sec(D) 3 x 10-22m/sech​

Match the followinga) k2co3 b) Na2O c) HNO3 d) So2 a)624 b)1384 c)644 d)634​

The uncertainity in the position of moving bullet of mass 10 gm is 10-5 m. The uncertainity in its velocity is(A) 5.2 x 10-28m/ sec(B) 3.0 x 10-28m/sec(C) 5.2 x 10-22m/sec(D) 3 x 10-22m/ sec​

On dissolving moderate amount of sodium metal in liquid NHg at low temperature, which one of the following does not occur(A) Blue coloured solution is due to ammoniated electrons(B) Liq NHbecomes good conductor of electricity(C) Liq NH, solution is paramagnetic(D) Liq NH, solution is diamagnetic​

Which of the following order is not correct as per the property indicated against it(A) LI

Define boiling. Why does temperature remain constant during boiling till all the liquidhas changed to vapor?(2)​

28. Complete and balance the following equations -a. Cu(NO3)2 + H250.-b. MgCO, + CH3COOHc. NaHCO, + H2SO4​

Lithium halides are covalent. This is because of(A) High hydration enthalpy of Li ion(B) High polarisation capability of Li ion(C) Large size of Li+ ion when compared to other elements in the same group(D) All of these​

⭐Explaination needed⭐Please don't post spam and copied answers ​___________________An organic compound containing carbon hydrogen and chlorine has 10% of carbon, 0.84 % of hydrogen and rest chlorine. what is the empirical formula of the compound.​

Orbital angular momentum depends =hence, it depends only on 'I' honpe it helps ​

M + 02 (Excess) → MO2 (sup er oxide)The element 'M' cannot be(A) Li(B) K(C) Rb(D) Cs​

Which is correct statement?For 4f, n=4, l=2For 3p, n=3, l=2For 1s, n=1, l=0For 4d, n=4, l=1

Mg + f2 -----> 2mgf here how do they say that electropositive element has been removed?

The mass of one mole of chloride formed by metal 'X' is 111.0 g. Which one could the formula of chloride. *XCl2XCl4XCl3XCl

OR(a) List the main points of difference between orbit and orbital.(b) List the main features of the "quantum mechanical model of atom".​

Features of quantum MECHANICAL model of atom

The electrons in an atom have only quantized value of energy.

These quantized values of energy are obtained from the SOLUTION of SCHRODINGER WAVE Equation. ...

The wave function Ψ is simply a function of coordinates of the electron and has no physical significance as such.

If heat of combustion of ch4is -XKJ/mol, then heat releasedduring Combustion ofa 0.16g ofCH4 will be​

11.Calculate the uncertainty in the momentum of an electron if it is confined to a linear region of length1 * 10-10.(h=6.626 *10-34)​

For the reaction 2A + 3BProducts, A is in excess and on chan-ging the concentration of B from 0.1M to 0.4 M, rate becomes doubled,Thus, rate law isdx = K[A]? [B]?dt​

Why do Different substances have different ignition temperature.plz don't spam and write other questions answer​

29.The principle source of volatile organics (Hydrocarbons) isa)Transportation b) Industrial processesc) Stationary fuel combustiond) Volcanoes​

30.The list of industrial sources of air pollution and their emissions are given. Match the following.A. Ammonia 1. Carbon monoxideB. Plating 2. ParticulatesC. Fertilizers 3. Metal fumesThe correct order isa) A-1, B-2, C-3b) A-3, B-2, C-1c) A-1, B-3, C-2d) A-3, B-1, C-2​

The Kinetic energy of one electron is 2.8 x 10-13 J. The de-Broglie wavelength is(A) 9.25 x 10-13 m(B) 9.25 x 10-16m(C) 9.25 x 10-8m(D) 18.5 x 10-13 m​

Which one of the following conditions is incorrect for a well behaved wave function ()(Α) ψ must be finite(B) Ümust be single valued(C) Umust be infinite(D) U must be continuousАB.C​

When the electron transition takes place from L-shell of an atom to M-shell the spectrum isa) atomic emission spectrum b) molecular emission spectrumc) atomic absorption spectrum d) molecular absorption spectrum

Which one of the following regions of electromagnetic radiation, the line spectrum appears when the electron transition occurs from energy level n = 5 to energy level n = 1 ?a) ultraviolet b) visible c) infrared d) for infrared

The splitting of line spectrum of hydrogen atom into finer lines under the influence of external magnetic field isa) Stark effect b) Photoelectric effect c) Zeeman effect d) Compton effect

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Which set of quantum numbers( n,l,m,s) is not possible for "f"orbitalA. 4,2,2,+1/2B. 4,3,-2,-1/2C. 5,3,0,+1/2D. 5,3,2,-1/2​

If sample of urea has meltingpoint of129 degree celsius then -a.It is impureb. It ispure©it cannotbe predictedd.Thecompound is not a urea​

(b) Mendeleev's contributions to the concept of periodic table laid the foundation for the Modern Periodic Table. Give reasons.

Why does Solid have the highest density? Why do Gases exhibit the mostrandom motion among the three state of matter

2.If magnesium reacts with hydrochloric acid, what gas is produced?A) HydrogenB) carbon dioxideC) oxygenD) chlorine

A. Out of zinc, iron and copper, which metal.candisplace the other two metals from their saltsolutions? Justify your response.

The subshell electronic configuration of an element is given in two way1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹which among these is the correct electronic configuration ? give reason.

Which of the following is the shape of PCl5 moleculea.trigonal pyramidal b.trigonal bipyramidal c.octahydral d.trigonal planar

The subshell electronic configuration of an element is given in two way1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹

Heisenberg's uncertainity principle is given mathematically asAx x A(mv.) To observe minimum uncertainty the value of 'n' must be(A) 1(B) 4(C) 6(D) 3

3. Balance the following chemical equations.(a) NaOH+H,SO, “Na SO, +1,0(b) KCIO, ”KCI + 0(C) Hg (NO3),+ KI → HgI,+KNO,1

Calculate the Bond lengthif HCL molecule if it's moment of inertia is 2.71×10 ^-40gcm and reduced is 1.63×10^-24g.

Sodium chloride salt is used for cookingIt is formed when hydoro chloric acid isadded to sodium hydroxide solution aboth of which are corrosive in nature.But sodium chloride is not . Give reasons.

Heya mates help pls!!!itz CHEMISTRYHey Samir!!I'm a student of ICSE board...

The uncertainity in the position of moving bullet of mass 10 gm is 10-5 m. The uncertainity in its velocity is(A) 5.2 x 10-28m/ sec(B) 3.0 x 10-2828 m/ sec(C) 5.2 x 10-22m/ sec(D) 3 x 10-22m/sech

Match the followinga) k2co3 b) Na2O c) HNO3 d) So2 a)624 b)1384 c)644 d)634

The uncertainity in the position of moving bullet of mass 10 gm is 10-5 m. The uncertainity in its velocity is(A) 5.2 x 10-28m/ sec(B) 3.0 x 10-28m/sec(C) 5.2 x 10-22m/sec(D) 3 x 10-22m/ sec

On dissolving moderate amount of sodium metal in liquid NHg at low temperature, which one of the following does not occur(A) Blue coloured solution is due to ammoniated electrons(B) Liq NHbecomes good conductor of electricity(C) Liq NH, solution is paramagnetic(D) Liq NH, solution is diamagnetic

Define boiling. Why does temperature remain constant during boiling till all the liquidhas changed to vapor?(2)

28. Complete and balance the following equations -a. Cu(NO3)2 + H250.-b. MgCO, + CH3COOHc. NaHCO, + H2SO4

Lithium halides are covalent. This is because of(A) High hydration enthalpy of Li ion(B) High polarisation capability of Li ion(C) Large size of Li+ ion when compared to other elements in the same group(D) All of these

⭐Explaination needed⭐Please don't post spam and copied answers ___________________An organic compound containing carbon hydrogen and chlorine has 10% of carbon, 0.84 % of hydrogen and rest chlorine. what is the empirical formula of the compound.

Orbital angular momentum depends =hence, it depends only on 'I' honpe it helps

M + 02 (Excess) → MO2 (sup er oxide)The element 'M' cannot be(A) Li(B) K(C) Rb(D) Cs

OR(a) List the main points of difference between orbit and orbital.(b) List the main features of the "quantum mechanical model of atom".

If heat of combustion of ch4is -XKJ/mol, then heat releasedduring Combustion ofa 0.16g ofCH4 will be

11.Calculate the uncertainty in the momentum of an electron if it is confined to a linear region of length1 * 10-10.(h=6.626 *10-34)

For the reaction 2A + 3BProducts, A is in excess and on chan-ging the concentration of B from 0.1M to 0.4 M, rate becomes doubled,Thus, rate law isdx = K[A]? [B]?dt

Why do Different substances have different ignition temperature.plz don't spam and write other questions answer

29.The principle source of volatile organics (Hydrocarbons) isa)Transportation b) Industrial processesc) Stationary fuel combustiond) Volcanoes

30.The list of industrial sources of air pollution and their emissions are given. Match the following.A. Ammonia 1. Carbon monoxideB. Plating 2. ParticulatesC. Fertilizers 3. Metal fumesThe correct order isa) A-1, B-2, C-3b) A-3, B-2, C-1c) A-1, B-3, C-2d) A-3, B-1, C-2

The Kinetic energy of one electron is 2.8 x 10-13 J. The de-Broglie wavelength is(A) 9.25 x 10-13 m(B) 9.25 x 10-16m(C) 9.25 x 10-8m(D) 18.5 x 10-13 m

Which one of the following conditions is incorrect for a well behaved wave function ()(Α) ψ must be finite(B) Ümust be single valued(C) Umust be infinite(D) U must be continuousАB.C

Which set of quantum numbers( n,l,m,s) is not possible for "f"orbitalA. 4,2,2,+1/2B. 4,3,-2,-1/2C. 5,3,0,+1/2D. 5,3,2,-1/2

If sample of urea has meltingpoint of129 degree celsius then -a.It is impureb. It ispure©it cannotbe predictedd.Thecompound is not a urea