1. A
   The molecules of soap are sodium or potassium salts of long chain fatty acids
2. B
   The molecules of soap contain both hydrophobic and hydrophilic ends
3. C
   Detergents are more effective than soaps in hard water
4. D
   In micelles the ionic-end of the molecules is towards oil droplet while the other end faces outside

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1. A
   A neutron is formed by combination of an electron and a proton. Therefore, it is neutral
2. B
   The mass of an electron is about 1/2000 times that of a proton
3. C
   An isotope of cobalt is used in the treatment of goiter
4. D
   J. J. Thomson proposed that the nucleus of an atom contains only neutrons

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1. A
   Electron
2. B
   Proton
3. C
   Positron
4. D
   Neutron

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1. A
   There is a neutral center in an atom called nucleus
2. B
   Nearly all the mass of an atom resides in the nucleus
3. C
   The electrons revolve around the nucleus in a circular path
4. D
   The size of a nucleus is very small as compared to the size of atom

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1. A
   Na
2. B
   Al
3. C
   Mg
4. D
   K

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1. A
   $\text{CO}$
2. B
   $\text{CO}_2$
3. C
   $\text{Na}_2\text{O}$
4. D
   $\text{MgO}$

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1. A
   $\text{SiO}_2$
2. B
   $\text{CO}_2$
3. C
   $\text{CaO}$
4. D
   $\text{MgO}$

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1. A
   A scale measuring hydrogen ion concentration in a solution is called pH scale
2. B
   The higher the hydrogen ion concentration in a solution, higher is its pH
3. C
   We can measure pH generally from 0 to 14 on a pH scale
4. D
   The 'p' in pH stands for 'potenz' in German meaning power

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1. A
   Half mole of nitrogen gas is measured 11.2 liter at STP
2. B
   17 gram of ammonia gas contains $6.022 \times 10^{23}$ molecules at STP
3. C
   22.4 litre of $\text{CO}_2$ gas at STP contains 44 gram of molecules
4. D
   4 gram of hydrogen gas contains $6.022 \times 10^{23}$ molecules

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1. A
   A compound is a substance composed of two or more elements, chemically combined in a fixed proportion
2. B
   Properties of a compound are different from its constituent elements
3. C
   A compound is an impure substance
4. D
   The constituents of a compound can be separated only by chemical or electrochemical reactions

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1. A
   A-4 B-2 C-1 D-3
2. B
   A-4 B-1 C-2 D-3
3. C
   A-3 B-1 C-2 D-4
4. D
   A-3 B-2 C-1 D-4

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1. A
   $\text{N}_2\text{O}$
2. B
   $\text{NO}_2$
3. C
   $\text{N}_2\text{O}_3$
4. D
   $\text{N}_2\text{O}_5$

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1. A
   If a substance loses hydrogen during reaction, it is reduced
2. B
   If a substance loses oxygen during reaction, it is reduced
3. C
   If a substance gains hydrogen during reaction, it is reduced
4. D
   If a substance gains oxygen during reaction, it is oxidized

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1. A
   A-1 B-2 C-4 D-3
2. B
   A-3 B-4 C-2 D-1
3. C
   A-1 B-4 C-2 D-3
4. D
   A-3 B-2 C-4 D-1

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1. A
   7.0
2. B
   6.6
3. C
   5.6
4. D
   8.0

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1. A
   1, 2 and 3
2. B
   1 and 2 only
3. C
   1 and 3 only
4. D
   3 only

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1. A
   2, 3, 1
2. B
   1, 2, 3
3. C
   2, 1, 3
4. D
   1, 3, 2

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1. A
   1 only
2. B
   1 and 2 only
3. C
   2 and 3 only
4. D
   1, 2 and 3

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1. A
   1 only
2. B
   1 and 2
3. C
   2 and 3
4. D
   3 only

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1. A
   Arctic Circle
2. B
   Equator
3. C
   Tropic of Cancer
4. D
   Tropic of Capricorn

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   Coastal South Africa
2. B
   East coast of Australia
3. C
   South Japan
4. D
   South Argentina

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1. A
   Andhra Pradesh
2. B
   Odisha
3. C
   Telangana
4. D
   Tamil Nadu

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1. A
   1 only
2. B
   1 and 2 only
3. C
   2 and 3 only
4. D
   1, 2 and 3

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