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Multiple Choice Questions
One and More than One Correct
1. Which of the vitamins given below is water soluble? [JEE Main 2015]
a. Vitamin C
b. Vitamin D
c. Vitamin E
d. Vitamin K
Answer: (a)
Solution:
Vitamin ‘B’ and ‘C’ are water soluble.
2. Which of the following compounds is not an antacid? [JEE Main 2015]
a. Aluminium hydroxide
b. Cimetidine
c. Phenelzine
d. Ranitidine
Answer: (c)
Solution:
Phenelzine is antidepressant drug.
3. The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of: [JEE Main 2016]
a. Fluoride
b. Lead
c. Nitrate
d. Iron
Answer: (c)
Solution:
Highest concentration is of nitrate ($100\text{ ppm}$).
4. Which of the following is an anionic detergent? [JEE Main 2016]
a. Sodium stearate
b. Sodium lauryl sulphate
c. Cetyltrimethyl ammonium bromide
d. Glyceryl oleate
Answer: (b)
Solution:
Sodium lauryl sulphate = detergent, anionic
Cetyltrimethyl ammonium bromide = detergent, cationic
Glyceryl oleate = detergent, non-ionic
Sodium stearate = soap, anionic
5. The distillation technique most suited for separating glycerol from spent-lye in the soap industry is: [JEE Main 2016]
a. Simple distillation
b. Fractional distillation
c. Steam distillation
d. Distillation under reduced pressure
Answer: (d)
Solution:
Glycerol is high liquid with B.P. $290^\circ\text{C}$. It can be separated from spent-lye by distillation under reduced pressure. Liquid is made to boil at lower temperature than normal temperature by lowering pressure on its surface, so external pressure is reduced and B.P. of liquid is lowered hence glycerol is obtained without decomposition at high temperature.
6. A water sample has ppm level concentration of following anions $\text{F}^- = 10$, $\text{SO}_4^{2-} = 100$, $\text{NO}_3^- = 50$. The anion/anions that make/makes the water sample unsuitable for drinking is/are
a. only $\text{SO}_4^{2-}$
b. only $\text{NO}_3^-$
c. both $\text{SO}_4^{2-}$ and $\text{NO}_3^-$
d. Only $\text{F}^-$
Answer: (d)
Solution:
$\text{NO}_3^-$ : The maximum limit of nitrate in drinking water is $50\text{ ppm}$. Excess nitrate in drinking water can cause disease, such as methemoglobinemia.
$\text{SO}_4^{2-}$ : above $500\text{ ppm}$ of $\text{SO}_4^{2-}$ ion in drinking water causes laxative effect otherwise, at moderate levels it is harmless.
$\text{F}^-$ : Above $2\text{ ppm}$ concentration of $\text{F}^-$ in drinking water causes brown mottling of teeth.
$\therefore$ The concentration given in question of $\text{SO}_4^{2-}$ and $\text{NO}_3^-$ in water is suitable for drinking but the concentration of $\text{F}^-$ (i.e $10\text{ ppm}$) make water unsuitable for drinking purpose.
7. The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting $[3\text{Ca}_3(\text{PO}_4)_2\cdot\text{Ca}(\text{OH})_2]$ to [JEE Main 2018]
a. $[3\{\text{Ca}_3(\text{OH})_2\}\cdot\text{CaF}_2]$
b. $[\text{CaF}_2]$
c. $[3(\text{CaF}_2)\cdot\text{Ca}(\text{OH})_2]$
d. $[3\text{Ca}_3(\text{PO}_4)_2\cdot\text{CaF}_2]$
Answer: (c)
Solution:
$\text{F}^-$ ions make the teeth enamel harder by converting $[3(\text{CaF}_2)\cdot\text{Ca}(\text{OH})_2]$
$$\text{Hydroxyapatite } [3\text{Ca}_3(\text{PO}_4)_2\cdot\text{Ca}(\text{OH})_2] \text{ to } [3\text{Ca}_3(\text{PO}_4)_2\cdot\text{CaF}_2] \text{ Fluorapatite}$$8. Which is wrong with respect to our responsibility as a human being to protect our environment? [JEE Main 2019]
a. Avoiding the use of floodlighted facilities
b. Restricting the use of vehicles
c. Using plastic bags
d. Setting up compost tin in gardens
Answer: (c)
9. A water sample has ppm level concentration of the following metals: Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is: [JEE Main 2019]
a. Zn
b. Fe
c. Mn
d. Cu
Answer: (c)
Solution:
(i) Zn = 2.0 (ii) Fe = 0.2 (iii) Mn = 5.0 (iv) Cu = 3.0
10. Which of the following conditions in drinking water causes methemoglobinemia ?
a. > 50 ppm of lead
b. > 100 ppm of sulphate
c. > 50 ppm of chloride
d. > 50 ppm of nitrate
Answer: (d)
Solution:
Concentration of nitrate $> 50\text{ ppm}$ in drinking water causes methemoglobinemia.
11. The temporary hardness of water is due to:- [JEE Main 2019]
a. Ca(HCO$_3$)$_2$
b. NaCl
c. Na$_2$SO$_4$
d. CaCl$_2$
Answer: (a)
Solution:
$\text{Ca}(\text{HCO}_3)_2$ is reponsible for temporary hardness of water.
12. Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them is: [JEE Main 2019]
a. A is more polluted than B
b. A is suitable for drinking, whereas B is not
c. B is more polluted than A
d. Both A and B are suitable for drinking
Answer: (c)
Solution:
Two glasses "A" and "B" have BOD values 10 and "20", respectively.
Hence, glass "B" is more polluted than glass "A".
13. The reaction that is NOT involved in the ozone layer depletion mechanism is the stratosphere is: [JEE Main 2019]
a. $\text{HOCl}(g) \xrightarrow{h\nu} \dot{\text{O}}\text{H}(g) + \dot{\text{C}}\text{l}(g)$
b. $\text{CF}_2\text{Cl}_2(g) \xrightarrow{uv} \dot{\text{C}}\text{l}(g) + \dot{\text{C}}\text{F}_2\text{Cl}(g)$
c. $\text{CH}_4 + 2\text{O}_3 \longrightarrow 3\text{CH}_2=\text{O} + 3\text{H}_2\text{O}$
d. $\text{ClO}(g) + \text{O}(g) \longrightarrow \dot{\text{C}}\text{l}(g) + \text{O}_2(g)$
Answer: (c)
14. A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of CO$_2$ at T = 298.15 K and p = 1 bar. If molar volume of CO$_2$ is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet? [Molar mass of NaHCO$_3$ = 84 g mol$^{-1}$] [JEE Main 2019]
a. 16.8
b. 8.4
c. 0.84
d. 33.6
Answer: (a)
15. An example of solid sol is: [JEE Main 2019]
a. Butter
b. Gem stones
c. Paint
d. Hair cream
Answer: (b)
16. Peroxyacetyl nitrate (PAN), an eye irritant is produced by: [JEE Main 2019]
a. Acid rain
b. Photochemical smog
c. Classical smog
d. Organic waste
Answer: (b)
Solution:
Photochemical smog produce chemicals such as formaldehyde, acrolein and peroxyacetyl nitrate (PAN).
17. Taj Mahal is being slowly disfigured and discoloured. This is primarily due to:- [JEE Main 2019]
a. Water pollution
b. Global warming
c. Soil pollution
d. Acid rain
Answer: (d)
Solution:
Taj Mahal is slowly disfigured and discoloured due to acid rain.
18. The higher concentration of which gas in air can cause stiffness of flower buds? [JEE Main 2019]
a. SO$_2$
b. NO$_2$
c. CO$_2$
d. CO
Answer: (a)
Solution:
Due to acid rain high concentration of $\text{SO}_2$ makes in plants the flower buds stiff and makes them fall.
19. Water samples with BOD values of 4 ppm and 18ppm, respectively, are: [JEE Main 2019]
a. Highly polluted and Clean
b. Highly polluted and Highly polluted
c. Clean and Highly polluted
d. Clean and Clean
Answer: (c)
Solution:
Clean water would have BOD value of less than $5\text{ ppm}$ whereas highly polluted water could have a BOD value of $17\text{ ppm}$ or more.
Matrix Match/Column Match
20. The correct match between Column I and Column II is: [JEE Main 2019]
Column I
A. Norethindrone
B. Ofloxacin
C. Equanil
Column II
1. Antibiotic
2. Anti-fertility
3. Hypertension
4. Analgesics
a. A$\rightarrow$2; B$\rightarrow$3; C$\rightarrow$4
b. A$\rightarrow$2; B$\rightarrow$1; C$\rightarrow$3
c. A$\rightarrow$4; B$\rightarrow$3; C$\rightarrow$1
d. A$\rightarrow$2; B$\rightarrow$3; C$\rightarrow$1
Answer: (b)
Solution:
A$\rightarrow$2; B$\rightarrow$1; C$\rightarrow$3
(A) Norethindrone – Antifertility
(B) Ofloxacin – Antibiotic
(C) Equanil – Hypertension (tranquillizer)
21. The correct match between Column I and Column II is: [JEE Main 2019]
Column I
A. Ester test
B. Carbylamine test
C. Phthalein dye test
Column II
1. Tyr
2. Asp
3. Ser
4. Lys
a. A$\rightarrow$2; B$\rightarrow$4; C$\rightarrow$1
b. A$\rightarrow$3; B$\rightarrow$2; C$\rightarrow$1
c. A$\rightarrow$2; B$\rightarrow$4; C$\rightarrow$3
d. A$\rightarrow$3; B$\rightarrow$4; C$\rightarrow$2
Answer: (a)
Solution:
A$\rightarrow$2; B$\rightarrow$4; C$\rightarrow$1
(A) Tyrosine (Tyr)
(B) Aspartic (Asp)
$$\text{H}-\text{O}-\text{C}(=\text{O})-\text{CH}_2-\text{CH}(\text{NH}_2)-\text{C}(=\text{O})-\text{OH}$$(C) Serine (Ser)
(D) Lysine (Lys)
A. Ester test $\rightarrow$ 2. Aspartic acid (Acidic amino acid)
B. Carbylamine $\rightarrow$ 4. Lysine ($\text{NH}_2$ group present)
C. Phthalein dye test $\rightarrow$ 1. Tyrosine
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