Question
| A. Tungsten | 1. Development of human civilization |
| B. Titanium | 2. Light bulb filament |
| C. Molybdenum | 3. Artificial joint |
| D. Copper | 4. Boiler plants |
✓
Answer
(A) - 2, (B) - 3, (C) - 4, (D) - 1
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
| Code. | A | B | C | D |
| (a) | 4 | 1 | 2 | 3 |
| (b) | 1 | 2 | 3 | 4 |
| (c) | 3 | 4 | 1 | 2 |
| (d) | 2 | 3 | 4 | 1 |
| List-I | List-II |
| A. Acid hydrolysis of an ester | 1. Fractional order reaction |
| B. Decomposition of $H _2 O _2$ | 2. Second order reaction |
| C. Decomposition of $CH _3 CHO$ | 3. Pseudo first order reaction |
| D. Substitution of methyl bromide with aqueous $KOH$. | 4. First order reaction |
| Code | A | B | C | D |
| (a) | 3 | 4 | 1 | 2 |
| (b) | 4 | 2 | 3 | 1 |
| (c) | 1 | 3 | 2 | 4 |
| (d) | 2 | 1 | 4 | 3 |
| Column-I | Column-II |
| A. Dow's process | 1. Salicylaldehyde |
| B. Schotten-Baumann reaction | 2. Phenol |
| C. Kolbe's reaction | 3. Phenyl benzoate |
| D. Reimer Tiemann Reaction | 4. Salicylic acid |
| Code. | A | B | C | D |
| (a) | 2 | 3 | 4 | 1 |
| (b) | 4 | 2 | 1 | 3 |
| (c) | 1 | 4 | 3 | 2 |
| (d) | 3 | 1 | 2 | 4 |
| A. Cr | 1. $[ Ar ] 3 d^{10} 4 s^2$ |
| B. Cu | 2. $[ Ar ] 3 d^5 4 s^1$ |
| C. Zn | 3. $[ Ar ] 3 d^1 4 s^2$ |
| D. Sc | 4. $[ Ar ] 3 d^{10} 4 s^1$ |
(i) Oxide ore - (a) Zinc blende
(ii) Carbonate ore - (b) Horn silver
(Hi) Sulphide ore - (c) Haematite
(iv) Chloride ore - (d) Calamine
(ii) Carbonate ore - (b) Horn silver
(Hi) Sulphide ore - (c) Haematite
(iv) Chloride ore - (d) Calamine
(i) White phosphorous – (a) Volcanic eruptions
(ii) Red phosphorous – (b) Yellow phosphorous
(iii) Phosphine – (c) Match boxes
(iv) $SO_2$ – (d) smoke screen
→(ii) Red phosphorous – (b) Yellow phosphorous
(iii) Phosphine – (c) Match boxes
(iv) $SO_2$ – (d) smoke screen
| Column-I | Column-II |
| A. Glycerol + dil. $HNO _3$ | 1. Meso oxalic acid |
| B. Glycerol + bismuth nitrate | 2. Oxalic acid |
| C. Glycerol + Fenton's reagent | 3. Glyceric acid + Tartronic acid |
| D. Glycerol + acidified $KMnO _4$ | 4. Glycerose |
| Code. | A | B | C | D |
| (a) | 3 | 1 | 4 | 2 |
| (b) | 1 | 2 | 3 | 4 |
| (c) | 4 | 3 | 2 | 1 |
| (d) | 2 | 4 | 1 | 3 |
| Electrolyte | Battery |
| (i) $NH _4 Cl + ZnCl _2+ H _2 O$ | (a) Mercury button cell |
| (ii) Paste of $KOH$ and $ZnO$ | (b) Lithium - ion battery |
| (iii) $38 \%$ by mass of $H _2 SO _4$ | (c) Leclanche cell |
| (iv) Lithium salt in an organic solvent | (d) Lead storage battery |
| Code: | A | B | C | D |
| $i$. | c | a | d | b |
| ii. | d | c | b | a |
| iii. | a | b | c | d |
| iv. | b | d | a | c |
| Column-I | Column-II |
| A. $K _{ a }=\frac{\alpha^2 c }{1- c }$ | 1. $pH$ value |
| B. $pH = pK _{ a }+\log \frac{\text { [salt }]}{\text { [acid }]}$ | 2. Buffer capacity |
| C. $\beta=\frac{ dB }{ d ( pH )}$ | 3. Ostwald's dilution law |
| D. $-\log _{10}\left[ H _3 O ^{+}\right]$ | 4. Henderson - Hasselbalch equation |
| (i) Li-ion battery | (a) Pacemakers |
| (ii) Mercury button cell | (b) Fuel cell |
| (iii) Lead storage battery | (c) Cell phone |
| (iv) $H _2- O _2$ cell | (d) Inverter |
| Code: | A | B | C | D |
| $i$. | a | b | c | d |
| ii. | d | c | b | a |
| iii. | b | d | a | c |
| iv. | c | a | d | b |