100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS Page 502 InterviewSolution

25051.	The metal that is extracted from sea water is: (a) Mg (b) Be (c) Ca (d) Sr
Answer» The metal that is extracted from sea water is Mg.

Discussion

25052.	The p-block element of group 15 that forms predominantly basic oxide is(a) N (b) P (c) As (d) Bi
Answer» (d) Bi forms basic oxides whereas N and P form acidic and As and Sb form amphoteric oxides

Discussion

25053.	The correct decreasing order of basic strength is:(a) AsH3 > SbH3 > PH3 > NH3(b) SbH3 > AsH3 > PH3 > NH3(c) NH3 > PH3 > AsH3 > SbH3(d) PH3 > AsH3 > SbH3 > NH3
Answer» (c) As the size of central atom increases the lone pair of electrons occupies a larger volume. In other words electron density on the central atom decreases and consequently its tendency to donate a pair of electrons decreases along with basic character from NH₃to BiH₃.

Discussion

25054.	The material used in the solar cells contains. (a) Cs (b) Si (c) Sn (d) Ti
Answer» The material used in the solar cells contains Si.

Discussion

25055.	When iodine reacts with NaF, NaBr and NaCl:(a) It gives mixture of F2, Cl2 and Br2 (b) It gives chlorine (c) It gives bromine (d) None of the above
Answer» (d) None of the above

Discussion

25056.	The products formed when a solution of CuSO4 is added to conc. solution of KI are (a) I2 + Cu+2 (b) CuI2 (c) I2 + Cu (d) Cu2I2
Answer» The products formed when a solution of CuSO₄ is added to conc. solution of KI are Cu₂I₂ .

Discussion

25057.	Chlorobenzene is? (1) More reactive than ethyl bromide (2) More reactive than isopropyl chloride (3) As reactive as methyl chloride (4) Less reactive than benzyl chloride
Answer» Chlorobenzene is Less reactive than benzyl chloride

Discussion

25058.	Chlorobenzene is prepared commercially by (1) Dow’s process (2) Deacon’s process (3) Raschig’s process (4) Etard’s process
Answer» Chlorobenzene is prepared commercially by Raschig’s process

Discussion

25059.	What is principle of operation of exhaust fan? Explain the installation of exhaust fan in details.
Answer» Exhaust fans work by sucking hot or humid air out of a small, localised area, allowing fresh air to enter from elsewhere (perhaps a doorway or vent) in order to replace it. The warm air that's drawn out using an exhaust fan is then pulled through a ducting system and expelled outside. How effective are exhaust fans: As these fans are only really effective in smaller rooms, one that is capable of moving approximately 2 cubic metres per second usually provides sufficient ventilation. For larger areas, a larger ventilation system may be more appropriate. Installation of exhaust fan: 1. Drill a reference hole and mark the ceiling. 2. Cut the intake-port hole. 3. Put the fan in position 4. Secure the fan to the joists 5. Find a suitable exit point for the duct pipe 6. Attach the vent cap 7. Wire the connections in the housing unit. 8. Attach the grille

25059.

What is principle of operation of exhaust fan? Explain the installation of exhaust fan in details.

Answer»

Exhaust fans work by sucking hot or humid air out of a small, localised area, allowing fresh air to enter from elsewhere (perhaps a doorway or vent) in order to replace it. The warm air that's drawn out using an exhaust fan is then pulled through a ducting system and expelled outside.

How effective are exhaust fans:

As these fans are only really effective in smaller rooms, one that is capable of moving approximately 2 cubic metres per second usually provides sufficient ventilation. For larger areas, a larger ventilation system may be more appropriate.

Installation of exhaust fan:

1. Drill a reference hole and mark the ceiling.

2. Cut the intake-port hole.

3. Put the fan in position

4. Secure the fan to the joists

5. Find a suitable exit point for the duct pipe

6. Attach the vent cap

7. Wire the connections in the housing unit.

8. Attach the grille

Discussion

25060.	What will be the radio of de - broglie wave lenth of `e^(-)` accelerated with 400 volt and 100 volt :-A. `1:2`B. `2:1`C. `3:10`D. `10:3`
Answer» Correct Answer - A `lamda_(1)/lamda_(2)=sqrt(V_(2)/(V_(1)))=sqrt(100)/(400)=(1)/(2)`

Discussion

25061.	Angular momentum of orbital of d electron is :-A. `sqrt(3/(2)(h)/(pi))`B. `sqrt(6)(h)/(2pi)`C. `(h)/(sqrt2pi)`D. `sqrt(3h)/(2pi)`
Answer» Correct Answer - B Angular momentum `=sqrt(l(l+1))(h)/(2pi)` `=sqrt(6)(h)/(2pi)`

Discussion

25062.	Calculate the temperature above which the given reaction become spontaneous. `C_((s)) + H_(2)O_((g)) rarr CO_((g)) + H_(2(g))` `DeltaH^(@) = + 131.3 KJ//"mole"` , `DeltaS^(@) = + 0.1336 KJ//"mole" K`A. `98.8 K`B. `709.8^(@)C`C. `491.4 K`D. `354.9^(@)C`
Answer» Correct Answer - B `Delta G = DeltaH - TDeltaS` `0 = +131.3 - T(+0.1336)` (for spontaneity) `T gt (131.3)/(0.1336) = 982.8 K` `t^(@)C gt 982.8 - 273 = 709 .8^(@)C`

Discussion

25063.	A certain transition to H spectrum from an excited state to ground state in one or more steps gives rise to total `10` lines .How many of these belong to UV spectrum ?A. `2`B. `3`C. `4`D. `5`
Answer» Correct Answer - C `10` lines are obtained as a result of elctronic transition from `5^(th)` level to lower levels and lines corresponding to `UV` spectrum are as followos : `5 rarr 1, 4 rarr 1, 3 rarr 1, 2 rarr 1`

Discussion

25064.	An eletron is in one of the `3d` orbitals. Give the possible values of `n, l,` and `m_(1)` for this electron.
Answer» `n=3, l=2, m=-2, -1, 0, +1, +2,` (any one value)

Discussion

25065.	How is the vapour pressure of a solvent affected when a non volatile solute is dissolved in it?
Answer» A non volatile solute particle lowers the vapour pressure of solvent because solute particles become surrounded by solvent particles when dissolved. This causes the particles of solvent to evaporate less because it requires more energy for the particles to do this since the solvent to solute attraction are strong. So the vapour pressure of a solution is less than that of the pure solvent. Vapour pressure depends on · Nature of liquid · Temperature · Presence of impurities

25065.

How is the vapour pressure of a solvent affected when a non volatile solute is dissolved in it?

Answer»

A non volatile solute particle lowers the vapour pressure of solvent because solute particles become surrounded by solvent particles when dissolved. This causes the particles of solvent to evaporate less because it requires more energy for the particles to do this since the solvent to solute attraction are strong. So the vapour pressure of a solution is less than that of the pure solvent.

Vapour pressure depends on

· Nature of liquid

· Temperature

· Presence of impurities

Discussion

25066.	Which will produce hard water ?A. Saturation og water with `CaSO_4`B. Addition of `Na_2SO_4` to waterC. Saturation of water with `CaCO_3`D. Saturation of water with `MgCO_3`.
Answer» Correct Answer - A `Ca^(2+)` and `Mg^(2+)` ions are responsible for hardness. Also `CaSO_4` is soluble in water to an appreciable amount.

Discussion

25067.	The atoms of different elements having same mass number but different atomic number are known as isobars. The sum of protons and neutrons, in the isobars is always different.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.
Answer» Correct Answer - C The assertion that the isobars are the atoms of different elements having same mass number but different atomic number is correct but reason is false because atomic mass is sum of number of neutrons and protons which should be same for isobars.

Discussion

25068.	An atom consists of theree energy levels given by a ground state with energy `E_(0)=0`, the first excited state with energy `E_(1)=K` and the second excited state with energy `E_(2)=2K` where `K gt 0`. The atom is initially in the ground state. Light from a laser which emits photons with energy `1.5 K` is shined on the atom. Which of the following is`//`are correct?A. The photons are absorbed, putting one atom in a state `E_(1)` and one atom in a state `E_(2)`B. A photon will always be absorbed, but half the time the atom will go into the state with energy K and the other half into state with energy 2K. In this way, energy will be conserved on the averageC. The atom absorbs a photon, goes into the the first excited state with energy K and emits a photon with energy 0.5 K to conserve energyD. The atom does not absorb any photon and stays in the ground state.
Answer» Correct Answer - D The atom will absorb photon whose energy is equal to the energy gap between two energy levels of the atom.

Discussion

25069.	The largest wavelength in the ultraviolet region of the hydrogen spectrum is `122` nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) isA. 802 nmB. 823 nmC. 1882 nmD. 1648 nm
Answer» Correct Answer - B The series in uv region is Lyman series. Longest wavelength corresponds to minimum energy which occurs in transition from `n =2` to `n =1` `:. 122 = (1//R)/((1)/(1^(2)-(1)/(2^(2))` ….(1) The smallest wavelength in the infrared region corresponds to maximum energy of paschen series. `lamda = (1//R)/((1)/(3^(2))-(1)/(infty))`....(2) from (1) and (2) `lamda = 823.5 nm`.

Discussion

25070.	Which does not represent correct method?A. `TiCl_2 + 2Mg to Ti + 2MgCl_2`, KrollB. `Ni(CO)_4 to Ni + 4CO` , MondC. `Ag_2CO_3 to 2Ag+CO_2+1/2 O_2` : Van ArkelD. `Zrl_4 to Zr + 2I_2` , Van Arkel
Answer» Correct Answer - C This process is simply calcination.

Discussion

25071.	Which of the following units does not have the same dimensions as the henry? (a) joule (ampere)-2 (b) tesla (metre)2 (ampere)-2 (c) ohm second (d) (farad)-1 (second)-1
Answer» Correct Answer is: (d) (farad)^-1 (second)^-1

Discussion

25072.	Assume that helium obeys the Bohr theory exactly. Which of the following transitions in helium will not give rise to a spectral line which has the same wavelength as some spectral line in the hydrogen spectrum? (a) From n = 4 to n = 2 (b) From n = 6 to n = 2 (c) From n = 8 to n = 4 (d) From n = 6 to n = 3
Answer» Correct Answer is: (d) From n = 6 to n = 3 For a transition from n = p to n = q in hydrogen, the photon energy is ε₁ = 13.6 (1/q² - 1/p²) eV. For a transition from n = a to n = b in helium, the photon energy is ε₂ = 4 x 13.6 (1/b² - 1/a²) eV = 13.6 {(2/b)² - (2/a)²} eV. For photons of the same energy to appear in the two spectra, 1/q² - 1/p² = (2/b)² - (2a)². This will be satisfied if b = 2q and a = 2p.

25072.

Assume that helium obeys the Bohr theory exactly. Which of the following transitions in helium will not give rise to a spectral line which has the same wavelength as some spectral line in the hydrogen spectrum? (a) From n = 4 to n = 2 (b) From n = 6 to n = 2 (c) From n = 8 to n = 4 (d) From n = 6 to n = 3

Answer»

Correct Answer is: (d) From n = 6 to n = 3

For a transition from n = p to n = q in hydrogen, the photon energy is ε₁ = 13.6 (1/q² - 1/p²) eV.

For a transition from n = a to n = b in helium, the photon energy is ε₂ = 4 x 13.6 (1/b² - 1/a²) eV = 13.6 {(2/b)² - (2/a)²} eV.

For photons of the same energy to appear in the two spectra,

1/q² - 1/p² = (2/b)² - (2a)².

This will be satisfied if b = 2q and a = 2p.

Discussion

25073.	10%(w/v) solution of glucose is isotonic with 4% (w/v) solution of non - volative solution then molar mass of non - vplatile solute will be :-A. 36B. 72C. 54D. 63
Answer» Correct Answer - B `(10)/(180)xx10=(4)/(m_(w))xx10rArrm_(w)=4xx18=72`

Discussion

25074.	The vapour pressure of mixture of toluene and xylene at `90^(@)`C is 0.5 atm. If at this temperature 400 mm and 150 mm respectively then what will be the mole fraction of toluene in mixture ?A. 0.08B. 0.92C. 0.88D. 0.46
Answer» Correct Answer - B `P_(s)=X_(A)P_(A)^(@)+(1-X_(A))P_(B)^(@)`

Discussion

25075.	Which of the following is not an ore of aluminium ?A. AnglesiteB. MicaC. BerylD. Orthoclass.
Answer» Correct Answer - A Anglesite (PbS) is an ore of lead while all others are the ores of aluminium.

Discussion

25076.	Which of the following factors is of no significance for roasting sulphide ore to the oxide and not subjecting sulphide ore to carbon reduction directly ?A. `CO_(2)` is more volatile than`CS_(2)`B. Metal sulphides are thermodynamically more stable than `CS_(2)`C. `CO_(2)` is thermodynamically more stable than `CS_(2)`D. Metal sulphides are less stable than the corresponding oxides.
Answer» Correct Answer - A `CS_(2)` is more volatile than `CO_(2)`. Therefore this option is of no significance.

Discussion

25077.	What will be the freezing point of 0.2 molal aqueous solution of `MgBr_(2)` ? If salt dissociates 40% in solution and `K_(f)` for water is 1.86 KKg `mol^(-1)`A. `-3.35^(@)`CB. `-0.67^(@)`CC. `-0.6^(@)`CD. `-0.45^(@)`C
Answer» Correct Answer - B `Delta T_(f)=ixx(1000K_(f)w)/(mW)` `DeltaT^(f)=ixxK_(f)xx"molality` `MgBr_(2)hArrMg^(+2)+2Br^(-)` `i=1-alpha+3alpha` `=1-0.4+3xx0.4=1.8` `:.DeltaT_(f)=1.8xx1.86xx0.2` and `T_(1)T_(f)-DeltaT=-0.67^(@)`C

Discussion

25078.	A compound of formula A2B3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms(1) hcp lattice - A, 1/3 Tetrahedral voids - B (2) hcp lattice - A, 2/3 Tetrahedral voids - B (3) hcp lattice - B, 2/3 Tetrahedral voids - A (4) hcp lattice - B, 1/3 Tetrahedral voids - A
Answer» The correct option is (4) hcp lattice - B, 1/3 Tetrahedral voids - A Explanation: Let B form hcp lattice no. of B = 6 tetrahedral void occupied by A = 1/3 x 12 = 4 A₄B₆ or A₂B₃

25078.

A compound of formula A2B3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms(1) hcp lattice - A, 1/3 Tetrahedral voids - B (2) hcp lattice - A, 2/3 Tetrahedral voids - B (3) hcp lattice - B, 2/3 Tetrahedral voids - A (4) hcp lattice - B, 1/3 Tetrahedral voids - A

Answer»

The correct option is (4) hcp lattice - B, 1/3 Tetrahedral voids - A

Explanation:

Let B form hcp lattice

no. of B = 6

tetrahedral void occupied by

A = 1/3 x 12 = 4

A₄B₆ or A₂B₃

Discussion

25079.	Excessive release of CO2 into the atmosphere results in : (1) depletion of ozone (2) polar vortex (3) global warming (4) formation of smog
Answer» The Correct option is (3) global warming

Discussion

25080.	Amongs the following which will show geometrical isomerism. (a) [Ni(NH3)5Cl]+ (b) [Ni(NH3)4ClBr] (c) [Ni(NH3)3Cl]+ (d) [Ni(NH3)2(NO2)2] (1) b, d (2) a, b (3) a, b & c (4) a, b, c & d
Answer» Answer: (b) [Ni(NH₃)₄ClBr], (d) [Ni(NH₃)₂(NO₂)₂] Ma₄bc can show 2 G.I. Ma₂b₂ can show 2 G.I. (Square planar)

25080.

Amongs the following which will show geometrical isomerism. (a) [Ni(NH3)5Cl]+ (b) [Ni(NH3)4ClBr] (c) [Ni(NH3)3Cl]+ (d) [Ni(NH3)2(NO2)2] (1) b, d (2) a, b (3) a, b & c (4) a, b, c & d

Answer»

Answer: (b) [Ni(NH₃)₄ClBr], (d) [Ni(NH₃)₂(NO₂)₂]

Ma₄bc can show 2 G.I.

Ma₂b₂ can show 2 G.I.

(Square planar)

Discussion

25081.	The percentage of carbon in cast iron isA. `5-10`B. `0.250-2.5`C. `2.5-4.5`D. `0.12-0.2`
Answer» Correct Answer - C Cast iron has 2.5- 4.5 percent of carbon.

Discussion

25082.	Which method is used for refining `Zr` and `Ti`? Explain with equation.
Answer» Var Arkel method is used for the refining or Zr and Ti.

Discussion

25083.	Consider the following table : Gasa/(k Pa dm6 mol–1 )b/(dm3 mol–1 )A642.320.05196B155.210.04136C431.910.05196D155.210.4382a and b are vander Waals constants. The correct statement about the gases is : (1) Gas C will occupy more volume than gas A; gas B will be more compressible than gas D (2) Gas C will occupy lesser volume than gas A; gas B will be more compressible than gas D (3) Gas C will occupy lesser volume than gas A; gas B will be lesser compressible than gas D (4) Gas C will occupy more volume than gas A; gas B will be lesser compressible than gas D
Answer» The Correct option is(1) Gas C will occupy more volume than gas A; gas B will be more compressible than gas D.

Discussion

25084.	I need three _______ of yogurt from the dairy section. A) tubes B) pounds C) containers D) dozens
Answer» Correct option is C) containers

Discussion

25085.	In comparison to boron, berylium has : (1) lesser nuclear, charge and greater first ionisation enthalpy (2) greater nuclear charge and greater first ionisation enthalpy (3) greater nuclear charge and lesser first ionisation enthalpy (4) lesser nuclear charge and lesser first ionisation ethalpy
Answer» (1) lesser nuclear, charge and greater first ionisation enthalpy

Discussion

25086.	Peptization is a: (1) process of converting soluble particles to form colloidal solution (2) process of converting precipitate into colloidal solution (3) process of bringing colloidal molecule into solution (4) process of converting a colloidal solution into precipitate
Answer» Correct option (2) process of converting precipitate into colloidal solution Explanation: fact peptization is a process of converting precipitate into colloidal solution.

25086.

Peptization is a: (1) process of converting soluble particles to form colloidal solution (2) process of converting precipitate into colloidal solution (3) process of bringing colloidal molecule into solution (4) process of converting a colloidal solution into precipitate

Answer»

Correct option (2) process of converting precipitate into colloidal solution

Explanation:

fact peptization is a process of converting precipitate into colloidal solution.

Discussion

25087.	The electronic spectrum of [Ti(H2O)6 ]3+ shows a single broad peak with a maximum at 20,300 cm–1. The crystal field stabilization energy (CFSE) of the complex ion, in kJ mol–1, is : (1) 242.5 (2) 83.7 (3) 145.5 (4) 97
Answer» (4) 97 CFSE = 0.4 Δ₀ = 0.4 × 20300 / 83.7 = 97 kJ/mol

25087.

The electronic spectrum of [Ti(H2O)6 ]3+ shows a single broad peak with a maximum at 20,300 cm–1. The crystal field stabilization energy (CFSE) of the complex ion, in kJ mol–1, is : (1) 242.5 (2) 83.7 (3) 145.5 (4) 97

Answer»

(4) 97

CFSE = 0.4 Δ₀

= 0.4 × 20300 / 83.7

= 97 kJ/mol

Discussion

25088.	Thermal power plants can lead to : (1) Ozone layer depletion (2) Eutrophication (3) Acid rain (4) Blue baby syndrome
Answer» (3) Acid rain Thermal power plants lead to acid rain.

25088.

Thermal power plants can lead to : (1) Ozone layer depletion (2) Eutrophication (3) Acid rain (4) Blue baby syndrome

Answer»

(3) Acid rain

Thermal power plants lead to acid rain.

Discussion

25089.	Bond order and magnetic nature of CN– are respectively (1) 3, diamagnetic (2) 3, paramagnetic (3) 2.5, paramagnetic (4) 2.5, diamagnetic
Answer» The answer is (1) 3, diamagnetic CN^– is a 14 electron system.

25089.

Bond order and magnetic nature of CN– are respectively (1) 3, diamagnetic (2) 3, paramagnetic (3) 2.5, paramagnetic (4) 2.5, diamagnetic

Answer»

The answer is (1) 3, diamagnetic

CN^– is a 14 electron system.

Discussion

25090.	Ellingaham diagram is used for - (1) Reduction(2) Electrolysis(3) Zone refining(4) Van-Arkel
Answer» The correct option is (1). Explanation: With the help of Ellingham diagram we can select proper reducing agent ( S(s) or CO or Al) for metal compound.

25090.

Ellingaham diagram is used for - (1) Reduction(2) Electrolysis(3) Zone refining(4) Van-Arkel

Answer»

The correct option is (1).

Explanation:

With the help of Ellingham diagram we can select proper reducing agent ( S(s) or CO or Al) for metal compound.

Discussion

25091.	Good reducing nature of H3PO2 attributed to the presence of (1) One P-OH bond (2) One P-H bond (3) Two P-H bonds (4) Two P-OH bonds
Answer» The correct option (3) Two P-H bonds Explanation: Then is two P-H bonds in the structure

25091.

Good reducing nature of H3PO2 attributed to the presence of (1) One P-OH bond (2) One P-H bond (3) Two P-H bonds (4) Two P-OH bonds

Answer»

The correct option (3) Two P-H bonds

Explanation:

Then is two P-H bonds in the structure

Discussion

25092.	Among the following the false statement is : (1) Latex is a colloidal solution of rubber particles which are positively charged. (2) Tyndall effect can be used to distinguish between a colloidal solution and a true solution. (3) Lyophilic sol can be coagulated by adding an electrolyte. (4) It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane.
Answer» Correct option: (1) Latex is a colloidal solution of rubber particles which are positively charged. Explanation: Rubber particles are negatively charged.

25092.

Among the following the false statement is : (1) Latex is a colloidal solution of rubber particles which are positively charged. (2) Tyndall effect can be used to distinguish between a colloidal solution and a true solution. (3) Lyophilic sol can be coagulated by adding an electrolyte. (4) It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane.

Answer»

Correct option: (1) Latex is a colloidal solution of rubber particles which are positively charged.

Explanation:

Rubber particles are negatively charged.

Discussion

25093.	In which of the following order of hydration energy correct.(1) Li+ > Na+ > K+ > Rb+ > Cs+ (2) Li+ > Na+ > K+ > Cs+ > Rb+ (3) Cs+ > Rb+ > K+ > Na+ > Li+ (4) Cs+ > Rb+ > K+ > Li+ > Na+
Answer» The correct option is (1). Explanation: Hydration decreases with decrement in charge density of ion.

25093.

In which of the following order of hydration energy correct.(1) Li+ > Na+ > K+ > Rb+ > Cs+ (2) Li+ > Na+ > K+ > Cs+ > Rb+ (3) Cs+ > Rb+ > K+ > Na+ > Li+ (4) Cs+ > Rb+ > K+ > Li+ > Na+

Answer»

The correct option is (1).

Explanation:

Hydration decreases with decrement in charge density of ion.

Discussion

25094.	Noradrenaline is one of the example :(a) Anti-depressant(b) Anti-Histamine(c) Nerurotransmitter(4) Antacid
Answer» Noradrenaline is one of the example of Nerurotransmitter

Discussion

25095.	Which of the following is incorrect about interstitial compounds.(1) Very reactive(2) High metallic conductivity(3) Very hard(4) High melting point
Answer» The correct option (1) Very reactive Explanation: Interstitial compound are almost inert so (A) is wrong statement.

25095.

Which of the following is incorrect about interstitial compounds.(1) Very reactive(2) High metallic conductivity(3) Very hard(4) High melting point

Answer»

The correct option (1) Very reactive

Explanation:

Interstitial compound are almost inert so (A) is wrong statement.

Discussion

25096.	Why is dihydrogen not preferred in weather balloons these days?
Answer» Dihydrogen is highly combustible and hence is likely to catch fire in excess of air (oxygen).

Discussion

25097.	There are two beakers (I) having pure volatile solvent and (II) having volatile solvent and non-volatile solute. If both beakers are placed together in a closed container then: (1) Volume of solvent beaker will decrease and solution beaker will increase (2) Volume of solvent beaker will increase and solution beaker will also increase (3) Volume of solvent beaker will decrease and solution beaker will also decrease (4) Volume of solvent beaker will increase and solution beaker will decrease
Answer» The answer is (1) Volume of solvent beaker will decrease and solution beaker will increase There will be lowering in vapour pressure in second beaker.

25097.

There are two beakers (I) having pure volatile solvent and (II) having volatile solvent and non-volatile solute. If both beakers are placed together in a closed container then: (1) Volume of solvent beaker will decrease and solution beaker will increase (2) Volume of solvent beaker will increase and solution beaker will also increase (3) Volume of solvent beaker will decrease and solution beaker will also decrease (4) Volume of solvent beaker will increase and solution beaker will decrease

Answer»

The answer is (1) Volume of solvent beaker will decrease and solution beaker will increase

There will be lowering in vapour pressure in second beaker.

Discussion

25098.	The incorrect statement(s) among (a) – (d) regarding acid rain is (are) : (a) It can corrode water pipes. (b) It can damage structures made up of stone. (c) It cannot cause respiratory ailments in animals. (d) It is not harmful for trees (1) (c) and (d) (2) (a), (b) and (d) (3) (c) only (4) (a), (c) and (d)
Answer» (2) (a), (b) and (d) (1) Acid rain corrodes water pipes resulting in the leaching of heavy of heavy metals such as iron, lead and copper into the drinking water. (2) Acid rain damages buildings and other structures made of stone or metal. (3) It causes respiratory aliments in human beings and animals. (4) It is harmful for agriculture, trees and plants as it wasshes down the nutrients needed for its growth.

25098.

The incorrect statement(s) among (a) – (d) regarding acid rain is (are) : (a) It can corrode water pipes. (b) It can damage structures made up of stone. (c) It cannot cause respiratory ailments in animals. (d) It is not harmful for trees (1) (c) and (d) (2) (a), (b) and (d) (3) (c) only (4) (a), (c) and (d)

Answer»

(2) (a), (b) and (d)

(1) Acid rain corrodes water pipes resulting in the leaching of heavy of heavy metals such as iron, lead and copper into the drinking water.

(2) Acid rain damages buildings and other structures made of stone or metal.

(3) It causes respiratory aliments in human beings and animals.

(4) It is harmful for agriculture, trees and plants as it wasshes down the nutrients needed for its growth.

Discussion

25099.	The question has two statements labeled as Assertion (A) and Reason (R). Choose the correct option from options given below.Assertion: If the net external force on the body is zero, then its acceleration is zero.Reason: Acceleration does not depend on force.1. A is correct but R is false.2. A is false but R is correct3. Both A and R are correct and R is the appropriate explanation of A4. Both A and R are correct but R is not an appropriate explanation of A
Answer» Correct Answer - Option 1 : A is correct but R is false. According to Newton’s second law, Force = Mass × Acceleration Means; Acceleration = Force/ Mass If the net external force on the body is zero (F = 0) Then; The acceleration of a body is also zero. Because the Mass of the body is not changed. So, Acceleration always depends upon the force. Hence, A is correct but R is false.

25099.

The question has two statements labeled as Assertion (A) and Reason (R). Choose the correct option from options given below.Assertion: If the net external force on the body is zero, then its acceleration is zero.Reason: Acceleration does not depend on force.1. A is correct but R is false.2. A is false but R is correct3. Both A and R are correct and R is the appropriate explanation of A4. Both A and R are correct but R is not an appropriate explanation of A

Answer» Correct Answer - Option 1 : A is correct but R is false.

According to Newton’s second law,

Force = Mass × Acceleration

Means;

Acceleration = Force/ Mass

If the net external force on the body is zero (F = 0)

Then;

The acceleration of a body is also zero.

Because the Mass of the body is not changed.

So, Acceleration always depends upon the force.

Hence, A is correct but R is false.

Discussion

25100.	Which among the following statements are correct ? (a) Aqua dag and oil dag are made up of graphite (b) Graphite reacts with conc. HNO3 to form mellitic acid C6(COOH)6 (c) C3O2 is also toxic like CO (d) Zircon, ZrSiO4 is a gemstone
Answer» (a) Aqua dag and oil dag are made up of graphite (b) Graphite reacts with conc. HNO₃to form mellitic acid C₆(COOH)₆ (d) Zircon, ZrSiO₄ is a gemstone

25100.

Which among the following statements are correct ? (a) Aqua dag and oil dag are made up of graphite (b) Graphite reacts with conc. HNO3 to form mellitic acid C6(COOH)6 (c) C3O2 is also toxic like CO (d) Zircon, ZrSiO4 is a gemstone

Answer»

(a) Aqua dag and oil dag are made up of graphite

(b) Graphite reacts with conc. HNO₃to form mellitic acid C₆(COOH)₆

(d) Zircon, ZrSiO₄ is a gemstone

Discussion

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