Chemistry set 1 MCQs

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Showing 504 questions
Q.91 What is the product of the following chemical reaction? NaCl +H2O+CO2 +NH3
A Gypsum
B Baking soda
C Washing soda
D Bleaching powder
Discuss / Board
Q.92 The condition when the amount of dissolved oxygen in a water body is alarmingly decreased is called:
A anoxia
B hypothermia
C acidification
D hypoxia
Discuss / Board
Q.93 Which of the following is an example of a physical change? In this example, there is no change in chemical composition of matter. A: Coal changing into coal ash on burning B: Preparing a sweet drink by mixing sugar in water C: White washing walls using a solution of lime and water D: Mixing salt and lemon juice in a beaker
A Only D
B Only A
C Only C
D Only B
Discuss / Board
Q.94 In which year did John Dalton present his atomic theory, the second part of which states that all atoms of a particular element are equal?
A 1825
B 1808
C 1811
D 1800
Discuss / Board
Q.95 In the periodic table, what is the trend for atomic radius as you move from left to right across a period (horizontal row)?
A Atomic radius remains constant
B Atomic radius decreases
C Atomic radius exhibits irregular behaviour
D Atomic radius increases
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Q.96 At 10 ×104 Pa pressure and 300 K temperature, the volume of 0.09 mol CO 2 gas is 22.4 × 10−3 m3. What will be the volume of the gas if the pressure is decreased to 2 × 104 Pa ?
A 112.0 ×10−3 m3
B 37.4 × 10−3 m3
C 56.3 × 10−3 m3
D 28.1 × 10−3 m3
Discuss / Board
Q.97 The space-filling model emphasises the relative size of each atom based on its .
A van der Waals radius
B fixed radius for all atoms
C ionic radius
D covalent radius
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Q.98 Which type of molecules show dipole dipole interaction?
A Non-polar molecules
B Molecules possessing permanent dipole
C Molecules possessing transient dipole
D Ionic molecules
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Q.99 Which of the following is a natural indicator for acid and base?
A Phenolphthalein
B Turmeric
C Methyl orange
D Universal indicator
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Q.100 Which of the following is a molecular compound?
A Sodium chloride
B Calcium oxide
C Water
D Magnesium sulfate
Discuss / Board
Q.101 The black coating formed on silver jewellery is:
A AgNO3
B Ag2CO3
C AgCl
D Ag2 S
Discuss / Board
Q.102 Which of the following raw materials is NOT used to prepare the baking soda?
A NH3
B Na2CO3
C NaCl
D H2O
Discuss / Board
Q.103 The iodine value of oil and fat indicates:
A Degree of unsaturation
B Saponification value
C Acid value
D Peroxide value
Discuss / Board
Q.104 Moseley observed that the plot of √𝑣 against atomic number (𝑍) gave a straigth line. What does 𝑣 indicate here?
A Frequency of 𝛾-rays emitted
B Frequency of 𝛼-rays emitted
C Frequency of X-rays emitted
D Frequency of 𝛽-rays emitted
Discuss / Board
Q.105 0.25 g of an organic compound, on treatment with fuming nitric acid followed by AgNO3, gave 0.22 g of AgBr . The percentage of bromine in the compound is ...........
A 88.00%
B 50.00%
C 37.45%
D 34.04%
Discuss / Board
Q.106 To which of the following classes of compounds does cyclohexane belong?
A Heterocyclic compound
B Non-benzenoid aromatic compound
C Benzenoid aromatic compound
D Alicyclic compound
Discuss / Board
Q.107 Non-polar molecules possess .
A partial charge
B no dipole moment
C permanent dipole moment
D instantaneous dipole moment
Discuss / Board
Q.108 The approximate number of water molecules present in 9 gm of water is .
A 6.022 ×1023
B 6.022 × 1022
C 3.011 ×1023
D 9.023 ×1023
Discuss / Board
Q.109 0.25 g of an organic compound gave 0.20 gof CO2 after complete combustion. The percentage composition of carbon is .
A 80.00%
B 78.18%
C 21.82%
D 4.60%
Discuss / Board
Q.110 Which of the following pollutants is responsible for the acidification of ocean?
A Carbon monoxide (CO)
B Carbon dioxide (CO2)
C Nitrogen Dioxide (NO2)
D Sulphur dioxide (SO2)
Discuss / Board
Q.111 The amount of dissolved oxygen in water becomes lowest at what time of the day?
A In the dawn
B In the evening
C At night time
D In the afternoon
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Q.112 The IUPAC name of CH3 −(CH2)18 − CH3 is .
A decane
B icosane
C triacontane
D dodecane
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Q.113 Which inorganic compound is known to undergo solid state reaction to form urea?
A Ammonium phosphate
B Ammonium cyanate
C Ammonium acetate
D Ammonium nitrate
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Q.114 What is the percentage of 's' character in the carbon atom of acetylene?
A 75%
B 25%
C 50%
D 33.33%
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Q.115 Helium gas can be converted to the liquid form by the .
A dipole-dipole forces of attraction
B London forces of attraction
C dipole-induced dipole forces of attraction
D hydrogen bonding interaction
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Q.116 What is the chemical formula for butane?
A C4H8
B C2H10
C C2H6
D C4H10
Discuss / Board
Q.117 What is the correct way to mix acid and water?
A The water must be added to the acid.
B The water must be heated before mixing.
C The acid must be heated before mixing.
D The acid must be slowly added to the water.
Discuss / Board
Q.118 What is the number of protons present in beryllium.
A 2
B 6
C 8
D 4
Discuss / Board
Q.119 Identify the number of electrons found in the outermost shell of halogen.
A 7
B 5
C 8
D 6
Discuss / Board
Q.120 The tendency of an atom or a functional group to attract a shared pair of electrons toward itself, is known as:
A electronegativity
B electron affinity
C electro-positivity
D electro attraction
Discuss / Board

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