Explore topic-wise InterviewSolutions in Current Affairs.

(b). NO₂ withdraws e^- from ortho/para positions 

Roasting-

Roasting is the process of converting an ore into its metallic oxide by heating strongly temperature insufficient to melt in excess of air.

4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂

2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

2ZnS + 3O₂ → 2ZnO + 2SO₂; S + O → SO₂↑

Calcination-

Calcination is the process in which concentrated ore is heated strongly is the presence of a limited supply of air in a rever beratory furnance. By doing so moisture is removed and impurities escape as their volatile oxides.

CaCO₃ → CaO + CO₂; Al₂O₃.2H₂O → Al₂O₃ +2H₂O

2Al(OH)₃ → Al₂O₃ + 3H₂O

CuCO₃Cu(OH)₂ → 2CuO +H₂O +CO₂

Correct option: (d) Oxalic acid and KMnO₄

Explanation: 

Phenolphthalein is an acid-base indicator.

Cd²⁺ salt is white because Cd²⁺ ion has d-orbital which is completely filled (4d¹⁰)

[Pt(NH₃)₃Cl₂]Cl₂ -

Dieamine diechlorido platinum (IV) chloride

Correct option: (d) Slightly basic

Explanation: 

Blood is alkaline having pH in between 7.0 to 7.4

pH + pOH = 14 pOH = 14 – pH = 14 – 9.62 = 4.38 

pOH = 4.38 = – log₁₀ [OH^– ]; 4.38 = – log₁₀ [OH^– ]

log₁₀[ OH^– ] = – 4.38 ; [OH^–] = antilog (–4.38) 

= antilog (5 – 4.38 – 5) = antilog (0.62 – 5) 

= antilog (0.62) x 10^–5 = 4.169 × 10^–5 mol dm^–3.

Consider acidic buffer mixture, 

CH₃COOH ⇌ CH₃COO^- + H⁺; CH₃COONa → CH₃COO^- + Na⁺ 

Here, acetic acid is a weak electrolyte, in its solution there exists equilibrium between it’s ions and molecules. Where as sodium acetate completely dissociates into it’s ions. 

Therefore, the buffer mixture contains large number of CH₃COO^- ions followed by Na⁺, H⁺, CH₃COOH. 

Case (i) When an acid added to this solution: H⁺ ion of the acid combines with CH₃COO^- ion in buffer solution and makes equilibrium with acetic acid. CH₃COO^- + H⁺ ⇌ CH₃COOH 

As a result, pH remains constant. 

Case (ii) When a base is added to this solution: OH^- ion of the base combines with H⁺ ion in buffer solution forms water molecule. 

H⁺+ OH^- → H₂O. 

As a result, pH remains constant.

Correct option: (a)

Explanation: 

This is Henderson equation for for basic buffer mixtures.

Cu₂O - Cu₂(l)O

 SnCl₄ - Sn(IV)Cl₄

 MnO -  Mn(II)O

 Fe₂O₃ - Fe₂(III)O₃ 

V₂O₅ - V₂(V)O₅

1. Oxidation: Loss of electron(s) by any species. 

2. Reduction: Gain of electron(s) by any species. 

3. Oxidising agent: Any species which accepts electrons). 

4. Reducing agent: Any species which donates electron^).

Correct answer is

D. None of the above

Correct option  (a) 2, 3

Here the [Cr(NH₃) ₄Cl₂]⁺ has a positive charge. 
NH3 has zero charge.
Cl has one -ve charge.
Let the oxidation number of Cr be x. 
So simple mathematical equation for charge on compound will be -
x + 4*0 + 2*(-1) = +1 
Solving we get 
x = +3

So, Oxidation number of Cr in [Cr(NH3) 4Cl2]^+ is +3

[Cr(NH₃)₄Cl₂]⁺

Tetra-amine-diechlorido chromium (III) ion.

The oxidation state of Cr in [Cr ((NH₃)₄Cl₂]⁺ is +3

Correct option  (b)  ΔH = 0, ΔS = +, ΔG = -

a). [Co(NH₃)₅Cl]Cl₂

a). CH₃COCH₃

(i).  a 

(ii). d 

(iii). c 

(iv). c 

(v).  a

(i). b 

(ii). c 

(iii). b 

(iv). a

Adult means a person who has completed 18 years of age.

(i) It is given that a reaction is first order in A and second order in B. 

(a) The differential rate equation is as follows: 

Rate =k[A][B]² 

(b) On increasing the concentration of B three times, rate becomes 9 times. 

(d[B])² = 3² = 9 

(c) When the concentrations of both A and B are doubled, rate becomes 8 times. 

d[A](d[B])² = 2×2² = 8 

(ii) The Freundlich's adsorption Isotherm is written as 

x/m = Kp^1/n It is also written as Log x/m=log K+1/n log P where, 

x = mass of adsorbate 

m = mass of adsorbent 

p = Equilibrium pressure of adsorbate 

K = Constant 

For the adsorption of solutes from solution the nature of plot of log\(\Big(\frac{x}{m}\Big)\) vs log C is linear.

Correct option  (c) Nucleophile is a Lewis acid

Explanation: 

Reason : Nucleophiles are electron rich species so act as Lewis base.

Correct option  (b) Propane-1,2,3-tricarboxylic acid

Household having adult members desirous of seeking unskilled wage employment in MGNREGA may apply for registration. The application for registration may be given on prescribed form or plain paper to the local Gram Panchayat. To allow maximum opportunities to families that may migrate, registration shall also be opened throughout the year at the GP office.

“Household” means the members of a family related to each other by blood, marriage or adoption and normally residing together and sharing meals or holding a common ration card.

Correct option (c) HClO₄ and NaClO₄ 

HClO₄ and NaClO₄ cannot act as an acidic buffer as HClO₄ is strong Acid 

Bronchioles.

Lymphatic system of human body.

(1) 'n' indicates haploid state and '2n' indicates diploid state of chromosomes. 

(2) Meiosis occurs in sex cells during the information of gametes. 

(3) The chromosomal number will not be constant in successive generations. 

(4) Meiosis.

Green glands or Malpighian tubules.

Sensory neuron.

Group -B →Charles Darwin, Lamark, A.R. Wallace, Charles Lyell

(1) Photosynthesis 

(2) A - Stroma ; B - Granum 

(3) Dark reaction 

(4) In granum during light reaction.

Accredited Social Health Activist.

Correct option (a) 14

Four rings and 10 double bond present

C.B. Van Neil.

Door to door survey helps to identify eligible households who have been missed out and wish to be registered under the Act. It should be undertaken by each GP every year and need to be ensured that this survey is held at that time of the year when people have not migrated to other areas in search of employment or for other reasons.

A household having adult members desirous of seeking unskilled employment in MGNREGA may apply for registration.

Throughout the Year

The registration is valid for five years and may be renewed/re-validated following process prescribed for renewal/revalidation as and when required.

Correct option  (c) (i), (iii) and (iv)

Any adult member can apply on behalf of Household.

The Gram Panchayat need to verify: - 

Whether the household is really an entity as stated in the application 

- Applicant households are local residents in the GP concerned 

- Applicants are adult members of the household 

The process of verification shall be completed not later than a fortnight after the receipt of the application.

Adult members of a household willing to do unskilled manual work can register themselves to obtain a job card under MGNREGA.

The State Government may make a printed form available as per format prescribed in the relavant Annexures of the MGNREGA Operational Guidelines 2013. However, a printed form should not be insisted upon.

Correct option is (c) Ba^2- 

Due to the high heat of hydration of small cations, ionic mobility for the small cations is low. Order of ionic mobility is Be²⁺< Mg²⁺< Sr²⁺ < Ba²⁺