100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS Page 541 InterviewSolution

27001.	Corundum and carbonundum are respectively.:A. `Al_(2)O_(3),SiC`B. `SiC,Al_(2)O_(3)`C. `Mg_(3)B_(2),Al_(2)O_(3)`D. `Mg_(2)B_(2)SiC`
Answer» Carborundum is silicon carbide, corundum is `Al_(2)O_(3)`.

Discussion

27002.	Is there any reaction whose rate does not decrease with time ?
Answer» Correct Answer - Zero order.

Discussion

27003.	Membrane-bound distinct structures are called organelle. An organelle that is not bounded by membrane is seen in the chloroplast and mitochondria.1. Identify cell organelle. 2. Write down its functions.
Answer» 1. Ribosome 2. Protein synthesis

27003.

Membrane-bound distinct structures are called organelle. An organelle that is not bounded by membrane is seen in the chloroplast and mitochondria.1. Identify cell organelle. 2. Write down its functions.

Answer»

1. Ribosome

2. Protein synthesis

Discussion

27004.	Different cells have different sizes. Arrange the following cells in ascending order of their size. Choose the correct option among the following.i. Mycoplasma ii. Ostrich eggs iii. Human RBC iv. Bacteria
Answer» The correct option is: i – iv – iii – ii

27004.

Different cells have different sizes. Arrange the following cells in ascending order of their size. Choose the correct option among the following.i. Mycoplasma ii. Ostrich eggs iii. Human RBC iv. Bacteria

Answer»

The correct option is:

i – iv – iii – ii

Discussion

27005.	Consider the following statements about Solar Eclipse1. It is a natural event that takes place on Earth when the Earth moves in its orbit between Moon and the Sun2. It happens at New Moon, when the Sun and Moon are in conjunction with each other.Which of the above statements is/are correct?1. 1 only2. 2 only3. Both 1 and 24. Neither 1 nor 2
Answer» Correct Answer - Option 2 : 2 only The correct answer is 2 only. In News The total solar eclipse on December 14, Monday will be the last eclipse of the year. Apart from Chile and Argentina, people living in southern parts of South America, south-west Africa, and Antarctica will be able to witness a partial solar eclipse. What is a Solar Eclipse? It is a natural event that takes place on Earth when the Moon moves in its orbit between Earth and the Sun (this is also known as an occultation). Hence, Statement 1 is NOT correct. It happens at New Moon when the Sun and Moon are in conjunction with each other. Hence, Statement 2 is correct. During an eclipse, the Moon’s shadow (which is divided into two parts: the dark umbra and the lighter penumbra) moves across Earth’s surface. Why isn’t there a solar eclipse every month? If the Moon was only slightly closer to Earth and orbited in the same plane and its orbit was circular, we would see eclipses each month. The lunar orbit is elliptical and tilted with respect to Earth’s orbit, so we can only see up to 5 eclipses per year. Depending on the geometry of the Sun, Moon, and Earth, the Sun can be totally blocked, or it can be partially blocked.

27005.

Consider the following statements about Solar Eclipse1. It is a natural event that takes place on Earth when the Earth moves in its orbit between Moon and the Sun2. It happens at New Moon, when the Sun and Moon are in conjunction with each other.Which of the above statements is/are correct?1. 1 only2. 2 only3. Both 1 and 24. Neither 1 nor 2

Answer» Correct Answer - Option 2 : 2 only

The correct answer is 2 only.

In News

The total solar eclipse on December 14, Monday will be the last eclipse of the year.
- Apart from Chile and Argentina, people living in southern parts of South America, south-west Africa, and Antarctica will be able to witness a partial solar eclipse.

What is a Solar Eclipse?
- It is a natural event that takes place on Earth when the Moon moves in its orbit between Earth and the Sun (this is also known as an occultation). Hence, Statement 1 is NOT correct.
  - It happens at New Moon when the Sun and Moon are in conjunction with each other. Hence, Statement 2 is correct.
  - During an eclipse, the Moon’s shadow (which is divided into two parts: the dark umbra and the lighter penumbra) moves across Earth’s surface.
Why isn’t there a solar eclipse every month?
- If the Moon was only slightly closer to Earth and orbited in the same plane and its orbit was circular, we would see eclipses each month. The lunar orbit is elliptical and tilted with respect to Earth’s orbit, so we can only see up to 5 eclipses per year.
- Depending on the geometry of the Sun, Moon, and Earth, the Sun can be totally blocked, or it can be partially blocked.

Discussion

27006.	Two inductor are connected as shown in figure. Mutual inductance between the inductor is M. Equivalent self-inductance of the circuit is(1) Leq = L1 + L2 + 2M(2) Leq = L1 + L2 - 2M(3) Leq = L1 + L2 + M(4) Leq = L1 + L2 - M
Answer» Correct option is (2) Leq = L1 + L2 - 2M

Discussion

27007.	A block of mass M is released from rest from height of y. When it fall down by y. its kinetic energy is : (1) mg(y - y0)(2) 1/2 mgy02(3) mgy0 (4) mgy02
Answer» Correct option (1) mg(y - y₀) W by gravity = mgh h = y - y₀

27007.

A block of mass M is released from rest from height of y. When it fall down by y. its kinetic energy is : (1) mg(y - y0)(2) 1/2 mgy02(3) mgy0 (4) mgy02

Answer»

Correct option (1) mg(y - y₀)

W by gravity = mgh

h = y - y₀

Discussion

27008.	The earth's magnetic field at a certain point is \( 7.0 \times \) \( 10^{-5} T \). This field is to be balanced by a magnetic field at the centre of a circular current carrying coil of radius \( 5 cm \) by suitably orienting it. If the coil has 100 turns then the required current (up to nearest integer) is \( X \) \( mA \). Find \( X \).
Answer» Magnetic induction due to circular coil at centre \(B =\frac{\mu_0NI}{2R}\) Then \(I = \frac{B.2R}{\mu_0N}\) \(I = \frac{7\times 10^{-5}\times 2\times 0.05}{4\pi \times 10^{-7}\times 100}\) \(I = \frac{7\times 10^{-5}\times 2\times 0.05}{4\times 3.14 \times 10^{-7} \times 100}\) \(I = \frac{0.7\times 10^{-5}}{12.56\times 10^{-5}}\) \(I = 0.055\) \(I = 55\times 10^{-3} A\) \(I = 55 mA\) Then \(X = 55\)

27008.

The earth's magnetic field at a certain point is \( 7.0 \times \) \( 10^{-5} T \). This field is to be balanced by a magnetic field at the centre of a circular current carrying coil of radius \( 5 cm \) by suitably orienting it. If the coil has 100 turns then the required current (up to nearest integer) is \( X \) \( mA \). Find \( X \).

Answer»

Magnetic induction due to circular coil at centre

\(B =\frac{\mu_0NI}{2R}\)

Then

\(I = \frac{B.2R}{\mu_0N}\)

\(I = \frac{7\times 10^{-5}\times 2\times 0.05}{4\pi \times 10^{-7}\times 100}\)

\(I = \frac{7\times 10^{-5}\times 2\times 0.05}{4\times 3.14 \times 10^{-7} \times 100}\)

\(I = \frac{0.7\times 10^{-5}}{12.56\times 10^{-5}}\)

\(I = 0.055\)

\(I = 55\times 10^{-3} A\)

\(I = 55 mA\)

Then

\(X = 55\)

Discussion

27009.	Enthalpy change for the reaction `2N_((g))+6H_((g))to2NH_(3(g))is-900 KJ` The dissociation energy of N - H bond isA. `+450 KJ`B. `-450 KJ`C. `+150KJ`D. `-150 KJ`
Answer» Correct Answer - C `DeltaH_(rxn)=-900=-6BE.(N-H)` B.E(N-H)=150kg

Discussion

27010.	Let A = {1, a1, a2...... a18, 77} be a set of integers with 1 < a1 < a2 <..... < a18 < 77. Let the set A + A = {x + y : x,y ∈ A} contain elements. Then, the value of a1 + a2 + ..... + a18 is equal to _____.
Answer» Correct answer is 702 a₁ , a₂ , a₃ ,..., a₁₈, 77 are in AP i.e. 1, 5, 9, 13, ..., 77. Hence a₁ + a₂ + a₃ +...+ a₁₈ = 5 + 9 + 13 +...18 terms = 702

27010.

Let A = {1, a1, a2...... a18, 77} be a set of integers with 1 < a1 < a2 <..... < a18 < 77. Let the set A + A = {x + y : x,y ∈ A} contain elements. Then, the value of a1 + a2 + ..... + a18 is equal to _____.

Answer»

Correct answer is 702

a₁ , a₂ , a₃ ,..., a₁₈, 77

are in AP i.e. 1, 5, 9, 13, ..., 77.

Hence a₁ + a₂ + a₃ +...+ a₁₈ = 5 + 9 + 13 +...18 terms

= 702

Discussion

27011.	Find the equation of the plane passing through the point (0, 7, -7) and containing the line (x + 1)/-3 = (y - 3)/2 = (z + 2)/1.
Answer» Any plane passing through (0, 7, -7) is a (x - 0) + b(y - 7) + c(z + 7) = 0 ...(i) If (i) contains the give line then it must pass through the point (-1, 3, -2) and must be parallel to the given line. If (i) passes through (-1, 3, -2) then a(-1 - 0) + b(3 - 7) + c(-2 + 7) = 0 a + 4b - 5c = 0 ...(ii) If (i) is parallel to the given line then, (-3)a + 2b + 1.c = 0 -3a + 2b + c = 0 ...(iii) By cross multiplication of (ii) and (iii) we get a/(4 + 10) = b/(15 - 1) = c/(2 + 12) a/14 = b/14 = c/14 a/1 = b/1 = c/1 = k a = k, b = k, c = k Putting a = k, b = k and c = k in (i), we get the required equation of the plane as k(x - 1) + k(y - 7) + k(z - 7) = 0 x + (y - 7) + (z + 7) = 0 x + y + z = 0

27011.

Find the equation of the plane passing through the point (0, 7, -7) and containing the line (x + 1)/-3 = (y - 3)/2 = (z + 2)/1.

Answer»

Any plane passing through (0, 7, -7) is a (x - 0) + b(y - 7) + c(z + 7) = 0 ...(i)

If (i) contains the give line then it must pass through the point (-1, 3, -2) and must be parallel to the given line.

If (i) passes through (-1, 3, -2) then

a(-1 - 0) + b(3 - 7) + c(-2 + 7) = 0

a + 4b - 5c = 0 ...(ii)

If (i) is parallel to the given line then, (-3)a + 2b + 1.c = 0

-3a + 2b + c = 0 ...(iii)

By cross multiplication of (ii) and (iii)

we get a/(4 + 10) = b/(15 - 1) = c/(2 + 12)

a/14 = b/14 = c/14

a/1 = b/1 = c/1 = k

a = k, b = k, c = k

Putting a = k, b = k and c = k in (i), we get the required equation of the plane as k(x - 1) + k(y - 7) + k(z - 7) = 0

x + (y - 7) + (z + 7) = 0

x + y + z = 0

Discussion

27012.	In an examination, there are 5 multiple choice questions with 3 choices, out of which exactly one is correct There are 3 marks for each correct answer, -2 marks for each wrong answer and 0 mark if the question is not attempted. Then, the number of ways a student appearing in the examination gets 5 marks is_.
Answer» x₁ + x₂ + x₃ + x₄ + x₅ = 5 Only one possibilities 3, 3, 3, -2, -2 Number of ways is = \(\frac{5!}{3!2!}\times2\times2=40\)

27012.

In an examination, there are 5 multiple choice questions with 3 choices, out of which exactly one is correct There are 3 marks for each correct answer, -2 marks for each wrong answer and 0 mark if the question is not attempted. Then, the number of ways a student appearing in the examination gets 5 marks is_.

Answer»

x₁ + x₂ + x₃ + x₄ + x₅ = 5

Only one possibilities 3, 3, 3, -2, -2

Number of ways is = \(\frac{5!}{3!2!}\times2\times2=40\)

Discussion

27013.	The number of one-one function f : {a, b, c, d}→ {0, 1, 2, … .,10} such that 2f(a) – f(b) + 3f(c) + f(d) = 0 is ______
Answer» 2f(a) + 3f(c) = f(d) - f(b) Using fundamental principle of counting Number of one-one function is 31

27013.

The number of one-one function f : {a, b, c, d}→ {0, 1, 2, … .,10} such that 2f(a) – f(b) + 3f(c) + f(d) = 0 is ______

Answer»

2f(a) + 3f(c) = f(d) - f(b)

Using fundamental principle of counting

Number of one-one function is 31

Discussion

27014.	Consider the binary operation * on Q defined by x * y = 1 + 12x + xy. x, y ∈ Q then 2 * 3 equals. (A) 31 (B) 41 (c) 43 (D) 51
Answer» Answer is (A) 31

Discussion

27015.	Consider the binary operation * on Q defined by x * y = 1 + 12x + xy, ∀ x,y ∈ R then 2 * 3 equals.(A) 31 (B) 41 (C) 43 (D) 51
Answer» Correct option: (A) 31

27015.

Consider the binary operation * on Q defined by x * y = 1 + 12x + xy, ∀ x,y ∈ R then 2 * 3 equals.(A) 31 (B) 41 (C) 43 (D) 51

Answer»

Correct option:

(A) 31

Discussion

27016.	Which of the following is the strongest reducing agent in aqueous medium?A. MgB. NaC. LiD. Ca
Answer» Correct Answer - C In an aqueous medium, `Li` is the strongest reducing agent, since the high negative enthalpy of hydration compensates high `IE_1`.

Discussion

27017.	In the decomposition of `H_2O_2` at 300 K, the energy of activation was found to be `18 kcal//"mol"` white it decreases to `6 kcal//"mol"` when the decomposition was carried out in the presence of a catalyst at 300 K.How many (Give you answer by multiplying `10^7`)
Answer» Correct Answer - 48 times Decomposition of `H_2O_2` order (Rxn)`H_2O_2toH_2OtoH_2O+1/2O_2` Then we know `K=Ae(-Ea)/(RT)` For uncatalysed Rxn `K_1=Ae(-Ea)/(RT) " " [T=300 K , R=2]` `K=Ae(-18xx10^3)/(2xx300)`..(i) and for catalysed Rxn `K_2=Ae(-6xx10^3)/(2xx300)`...(ii) Equation (2)/(1) `K_2/K_1=e((18-6)xx10^3)/(2xx300)` `K_2/K_1=e^20` `K_2/K_1=4.85xx10^8` Then catalysed reaction is `4.85xx10^8` times faster than uncatalysed Rxn.

Discussion

27018.	There is no relation between the stoichiometry of the reaction and order of the reaction, order is always experimently calculated. Monitoring of the progress of the reaction can be done by pressure measurement (`P_0,P_t` & `P_oo` are total pressure of reaction mixture at time, t=0, t=t & `t=oo`) .All following reactions in Column-1 have half life 5 minutes. Select incorrect combination for `I^(st)` order reaction :A. (i)(i)(Q)B. (iv)(i)(Q)C. (iv)(iv)(S)D. (IV)(ii)(S)
Answer» Correct Answer - D In column-1 (i) &(iv) are `I^(st)` order reactions for `I^(st)` order `t_(3//4)=2t_(1//2)`

Discussion

27019.	C. Benzoic acid Splitting of ester by alcohol isa. Alcoholysisb. Acidolysisc. Hydrolysisd. Esterification
Answer» In Fischer esterification reaction, Benzoic acid is esterified with methanol in the presence of sulfuric acid (an acid catalyst) to produce methyl benzoate (an ester).

27019.

C. Benzoic acid Splitting of ester by alcohol isa. Alcoholysisb. Acidolysisc. Hydrolysisd. Esterification

Answer»

In Fischer esterification reaction,

Benzoic acid is esterified with methanol in the presence of sulfuric acid (an acid catalyst) to produce

methyl benzoate (an ester).

Discussion

27020.	A reaction with respect to X is zero order till the concentration is reduced to half of initial concentration.Then this reaction become first order with respect to it.If the value of rate constants for the zero order and first order are equal to k (in magnitude), then find the time taken to reduce the concentration of X to `1/16th` of its original concentration `X_0`.A. `1/(2k)+(3ln2)/k`B. `x_0/(2k)+(3ln2)/k`C. `x_0/(2k)+(4ln2)/k`D. `1/(2k)+(4ln2)/k`
Answer» Correct Answer - B `xto` product (zero order) Till the concentration of X changes from `X_0` to `X_0/2` , it is zero order with rate constant k. Time taken for concentration to becomes `X_0/2=(t_(1//2)` for zero order )=`X_0/(2k)` After reaching `X_0/2` , the reaction becomes first order `Xto`product (I order) `X_0/2underset((ln2)/k)toX_0/4underset((ln2)/k)toX_0/8underset((ln2)/k)toX_0/16implies ` total time of reach `X_0/16` from `X_0` is `=X_0/(2k)+(3ln2)/k`

Discussion

27021.	What is the rate of the reaction given below:2Na + Cl2 → 2NaCl
Answer» 2Na + Cl₂ → 2NaCl In the reaction, two different elements are combining together to form a compound, therefore, it is a combination reaction. Combination reaction is a reaction in which two or more simple substances combine under suitable conditions to form a single compound. Cl₂ + 2Na \(\longrightarrow\)2NaCl rate of reaction r = \(\frac{-d[Cl_2]}{dt}=-\frac12\frac{d[Na]}{dt}=+\frac12\frac{d[NaCl]}{dt}\)

27021.

What is the rate of the reaction given below:2Na + Cl2 → 2NaCl

Answer»

2Na + Cl₂ → 2NaCl

In the reaction, two different elements are combining together to form a compound, therefore, it is a combination reaction. Combination reaction is a reaction in which two or more simple substances combine under suitable conditions to form a single compound.

Cl₂ + 2Na \(\longrightarrow\)2NaCl

rate of reaction r = \(\frac{-d[Cl_2]}{dt}=-\frac12\frac{d[Na]}{dt}=+\frac12\frac{d[NaCl]}{dt}\)

Discussion

27022.	What is the atomicity of aluminium phosphate ?A. 8B. 6C. 5D. 13
Answer» Correct Answer - B The chemical formula for aluminium phosphate is `AIPO_(4)` Atomicity of heternuclear molecule = total number of atoms present `:.` Atomicity of `AIPO_(4) - 1 + 1 + 4 = 6`

Discussion

27023.	Amongst the following, the total number of compounds soluble in concentrated `NH_3` solution is: (A)`Ag_2CrO_4`, (B)`Cu(OH)_2 .CuSO_4`, (C )`PbSO_3` , (D)`Al(OH)_3` , (E)`NI(OH)_2` (F)`Zn_3(PO_4)_2`, (G)`BaSO_4`, (H)`Bi(OH)_2NO_3` , (I)`Mn(OH)_2`
Answer» Correct Answer - 4 (A)`Ag_2CrO_4darr(yellow)+NH_3to[Ag(NH_3)_2]^(+)+CrO_4^(2-)` (B)`Cu(OH)_2. CuSO_4 darr (blue )+8NH_3 to 2[Cu(NH_3)_4]^(2+)+SO_4^(2-)+2OH^(-)` (C )`PbSO_3darr(white)+4OH^(-)to[Pb(OH)_4]^(2-)+SO_3^(2-)` Soluble in sodium hydroxide not in `NH_3` (D)Soluble in sodium hydroxide not in `NH_3` (E)`Ni(OH)_2darr(green )+6NH_3to[ni(NH_3)_6]^(2-)`(deep blue colouration ) +`2OH^-` (F)`Zn_3(PO_4)_2darr(white)+12NH_3to3[Zn(NH_3)_4]^(2-)+2PO_4^(3-)` (G)Insoluble in `NH_3` , soluble appreciably in boiling concentrated `H_2SO_4` (H)`Bi(OH)_2NO_3` is insoluble in `NH_3` (I)Insoluble in `NH_3` but soluble in ammonium salts liberating `NH_3`

Discussion

27024.	The basicity of pyrophosphorus acid is(a) 2 (b) 4 (c) 1 (d) 5
Answer» (a) Pyrophosphorous acid (H₄P₂O₅) is a dibasic acid as it contains two P—OH bonds

Discussion

27025.	The oxidation state of phosphorus in cyclotrimetaphosphoric acid is(a) +3 (b) +5 (c) –3 (d) +2
Answer» (b) Formula of cyclotrimetaphosphoric acid is (HPO₃)₃ Oxidation state of ‘P’ is 3(+ 1 + x + 3 (– 2)) = 0 ⇒ x + – 6 + 1 = 0 ⇒ x = + 5

27025.

The oxidation state of phosphorus in cyclotrimetaphosphoric acid is(a) +3 (b) +5 (c) –3 (d) +2

Answer»

(b) Formula of cyclotrimetaphosphoric acid is (HPO₃)₃

Oxidation state of ‘P’ is 3(+ 1 + x + 3 (– 2)) = 0

⇒ x + – 6 + 1 = 0 ⇒ x = + 5

Discussion

27026.	Which among the following compounds is obtained when ethane nitrile is acid hydrolysed?A. Formic acidB. AcetamideC. FormamideD. Acetic acid
Answer» Correct Answer - D Acetic acid is obtained when ethanenitrile is acid hydrolysed. The equation for the reaction can be written as: `underset("Ethane nitrile")(CH_(3)CN) + 2H_(2) O overset(H^(+))(to) underset("Acetic acid")(CH_(3)COOH) + NH_(4)CI`

Discussion

27027.	Consider the following statements:Statement I: Isobutanol does not give idoform test. Statement II: It does not have α-hydrogen.Of these statements:(a) Both the statement are true and Statement II is the correct explanation of Statement I(b) Both the statement are true, but statement II is not the correct explanation of Statement I(c) Statement I is true, but Statement II is false(d) Statement I is false. but Statement II is true
Answer» Answer (c) Statement I is true, but Statement II is false

Discussion

27028.	Complete the following: `CaC_(2)+2D_(2)Oto`?
Answer» `CaC_(2)+2D_(2)Oto Ca(OD)_(2)+DC-=CD`

Discussion

27029.	Consider the following statements:Statement I: [CO(NH3)3Cl3] gives white precipitate with AgNO3 solution. Statement II: Chlorine is not present in the ionising sphere.Of these statements:(a) Both the statement are true and Statement II is the correct explanation of Statement I(b) Both the statement are true, but statement II is not the correct explanation of Statement I(c) Statement I is true, but Statement II is false(d) Statement I is false. but Statement II is true
Answer» Answer (d) Statement I is false. but Statement II is true

Discussion

27030.	Which of the following statements is incorrect?A. Silver glance mainly contains silver sulphideB. Gold is found in native stateC. Zinc blende mainly contains zince chlorideD. Copper pyrites also contain `Fe_(2)S_(3)`
Answer» Correct Answer - C Zince belnds is `ZnS` not `ZnC1_(2)`.

Discussion

27031.	Which of following is/are not affected by temperature?(a) Molarity(b) Mole fraction(c) Molality(d) Normality
Answer» Answer (c,d) Molality, Normality

Discussion

27032.	Which of the following is not an ore of lead?A. GalenaB. AnglesiteC. CalamineD. Cerussite
Answer» Correct Answer - C Galena `(PbS)`, Anglesite `(PbSO_(4))` Calamine `(ZnSCO_(3))`, Cerussite `(PbCO_(3))`

Discussion

27033.	Which of the following is not a refining process?A. DressingB. van Arkel processC. CementationD. Poling
Answer» Correct Answer - C Cementation is not a refining process

Discussion

27034.	Among the following statements, the incorrect one isA. Calamine and siderite are carbonatesB. Argentite and cuprite are oxidesC. Zinc blende and pyrites are sulphidesD. Malachite and azurite are ores of copper
Answer» Correct Answer - B Cuprite `(Cu_(2)O)` and Argentite `(AG_(2)S)`

Discussion

27035.	Which one of the following is correct?A. A mineral cannot be an oreB. An ore cannot be a mineralC. All minerals are oresD. All ores are minerals
Answer» Correct Answer - D All ninerals are not suitable for the extraction of metals commercially. Thus all ores are minerals, but all minerals are not ores.

Discussion

27036.	Which of the following undergo aldol condensation?(a) HCHO(b) CH3CHO(c) C6H5CHO(d) CH3COCH3
Answer» Answer (b,d) CH₃CHO, CH₃COCH₃

Discussion

27037.	The auto reduction process is not used in the metallurgy ofA. FeB. CuC. PbD. Ag
Answer» Correct Answer - A Fe is electropositive

Discussion

27038.	Read carefully the passage and select the correct answer from the given four option of the questions:An orange solid (A) on heating gave a green residue (B), a colourless gas (C) and water vapour. The gas(C) on passing over heated Mg gave white solid (D) which on reaction with water gave a gas (E). The gas (E) forms white fumes with HCl.The white solid (D) formed is(a) NH4Cl(b) Mg3N2(c) NH4OH(d) (NH4)2CO3
Answer» Answer (a) NH₄Cl

Discussion

27039.	Among `TeF_6,SeF_6` and `SF_6` which is more stable?
Answer» `SF_6` is most stable.

Discussion

27040.	Arrange `H_(2)TeO_(3),H_(2)SeO_(3)` and `H_(2)SO_(3)` in increasing order of acid strength.
Answer» Acid strength: `H_2TeO_3ltH_2SeO_3ltH_2SO_3`

Discussion

27041.	What is the relation between acid strength and atomic number of central atom?
Answer» The strength of the oxoacid decreases as the atomic number of the ncentral atom increases.

Discussion

27042.	Which of the following is NOT present in DNA? (A) Adenine (B) Guanine (C) Thymine (D) Uracil
Answer» Answer is: (D) Uracil

27042.

Which of the following is NOT present in DNA? (A) Adenine (B) Guanine (C) Thymine (D) Uracil

Answer»

Answer is:

(D) Uracil

Discussion

27043.	Name the product obtained when Benzene is hydrogenated in presence of heated Nickel catalyst.
Answer» Cyclohexane when Benzene is hydrogenated in presence of heated Nickel catalyst.

Discussion

27044.	`CO` on passing over heated nickel givesA. `Ni(CO)_(4)`B. `NiCO_(3)`C. `CO + H_(2)`D. `CO_(2)+H_(2)`
Answer» Correct Answer - A `Ni + 4CO overset(Delta) rarr Ni(CO)_(4)`.

Discussion

27045.	There are many types of heat treating processes available to steel. The most common are ____________ quenching, and tempering.(a) dealing(b) healing(c) annealing(d) milling
Answer» The correct option is (c) annealing Explanation: Annealing is the process of heating the steel to a sufficiently high temperature to relieve local internal stresses. It does not create a general softening of the product but only locally relieves strains and stresses locked up within the material. Annealing goes through three phases: recovery, recrystallization, and grain growth. The temperature required to anneal a particular steel depends on the type of annealing to be achieved and the alloying constituents.

Discussion

27046.	Before introducing `FeO` in blast furance, it is converted to `Fe_(2)O_(3)` by roasting so thatA. It may not be removed as slag with silicaB. Oresence of it may increase the melting point of chargeC. It may not evaporate in the furnaceD. None of the above
Answer» Correct Answer - A `FeO` forms slag with silica, `SiO_(2)` `FeO + SiO_(2) rarr FeSiO_(3)`.

Discussion

27047.	During Bessemerisation of copper, the reaction taking place in the Bessemer converter isA. `Cu_(2)S + 2Cu_(2)O rarr 6Cu + SO_(2)`B. `Cu_(2)O + FeS to Cu_(2)S + FeO`C. `FeO + SiO_(2) to FeSiO_(3)`D. None of the above
Answer» Correct Answer - A Auto-reduction of copper sulphide.

Discussion

27048.	In the metallurgy of aluminiumA. `Al^(3+)` is oxidised to Al (s)`B. graphite anode is oxidised to carbon monoxide and carbon dioxide.C. oxidation state of oxygen changes in the reaction at anode.D. oxidation state of oxygen changes in the overall reaction involved in the process.
Answer» Correct Answer - B It is the correct answer.

Discussion

27049.	In `Mac` Arthur Forest method, silver is extracted from the solution of `Na[Ag(CN)_(2)]` by the use ofA. FeB. MgC. CuD. Zn
Answer» Correct Answer - D In Mac-Arthur Forest method , silver is extracted from the solution of sodium argentocyanide by using zinc. `2Na[Ag(CN)_(2)]+Zn to Na_(2)[Zn(CN)_(4)]+2Ag darr `

Discussion

27050.	In which of the following pair of metals, both are commerically extracted from their respective ores by self-reduction method?A. `Zn,Cu`B. `Pb,Cu`C. `Sn,Zn`D. `A1,Ag`
Answer» Correct Answer - B (i) Extraction of tin (carbon reduction): `SnO_(2)+C rarr SnO +CO` (ii) Extraction of zinc (carbon reduction): `ZnO +C overset(coke,673)rarr Zn +CO` (iii) Extraction of lead (self- reduction): `PbS +2O_(2)rarrPbSO_(4)`, `PbS +3O_(2)rarr 2PbO+2SO_(2)`, `PbS + 2PbO rarr 3Pb + SO_(2)`, `PbS + PbSO_(4) rarr 2Pb + 2SO_(2)` (iv) Extraction of copper (self -reduction) `2CuFeS_(2) + 4O_(2) rarr Cu_(2)S+2FeO +3SO_(2)` `CU_(2)S +FEO +SiO_(2)rarrFeSiO_(3)` (fusible slag) `+Cu_(2)S` (matte) `2Cu_(2)S +3O_(2)rarr 2Cu_(2)O +2SO_(2)`, `2Cu_(2)O +Cu_(2)S rarr 6Cu +SO_(2)` (v) Extraction of aluminium (electroytic reduction, Hall-Heroult process): The purified `A1_(2)O_(3)` ia mixed with `Na_(3)A1F_(6)` (cryolite) or `CaF_(2)` (fluorspar) which lowers the melting point of the mixture and increases conductivity. The fused matrix is electrolysed. Cathode: `A1^(3+) ("melt") +3e^(-) rarr A1(1)` Anode: `C(s) +O^(2-) ("melt")rarr CO(g) +2e^(-)` `C(s) +2O^(2-)("melt") rarr CO_(2) +4e^(-)` (vi) Extraction of gold//silver (leaching and displacement method): `4Au//Ag(s) +8CN^(-) (aq)+2H_(2)O(aq)+O_(2) (g) rarr 4[Au//Ag(CN)_(2)]^(-)(aq) +4OH^(-)(aq)` `2(Au//Ag(CN)_(2)]^(-)(aq)+Zn(s) rarr 2Au//Ag(s) +[Zn(CN)_(4)]^(2-)(aq)`

Discussion

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Corundum and carbonundum are respectively.:A. `Al_(2)O_(3),SiC`B. `SiC,Al_(2)O_(3)`C. `Mg_(3)B_(2),Al_(2)O_(3)`D. `Mg_(2)B_(2)SiC`

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What is the rate of the reaction given below:2Na + Cl2 ​→ 2NaCl

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Complete the following: `CaC_(2)+2D_(2)Oto`?

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In the metallurgy of aluminiumA. `Al^(3+)` is oxidised to Al (s)`B. graphite anode is oxidised to carbon monoxide and carbon dioxide.C. oxidation state of oxygen changes in the reaction at anode.D. oxidation state of oxygen changes in the overall reaction involved in the process.

In `Mac` Arthur Forest method, silver is extracted from the solution of `Na[Ag(CN)_(2)]` by the use ofA. FeB. MgC. CuD. Zn

In which of the following pair of metals, both are commerically extracted from their respective ores by self-reduction method?A. `Zn,Cu`B. `Pb,Cu`C. `Sn,Zn`D. `A1,Ag`

Let A = {1, a1, a2...... a18, 77} be a set of integers with 1 < a1 < a2 <..... < a18 < 77. Let the set A + A = {x + y : x,y ∈ A} contain elements. Then, the value of a1 + a2 + ..... + a18 is equal to _____.

What is the rate of the reaction given below:2Na + Cl2 → 2NaCl