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question_answer1)
Different substances are classified as:
I Pure substance |
II Homogeneous mixture |
III Heterogeneous mixture |
A few common substances are listed below.
(i) Air,
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(ii) Graphite,
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(iii) Gasoline,
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(iv) Diamond,
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(v) Tap water,
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(vi) Iron,
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(vii) Sodium chloride,
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(viii) Iodised salt,
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(ix) Brass,
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(x) Oil and water
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Which of the following represents the correct classification of the given substances?
A)
B)
C)
D)
None of these represents the correct match. done
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question_answer2)
Nidhi took two China dishes and marked them as I and II.
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In China dish I, she mixed iron filings and sulphur powder. In China dish II, she mixed iron filings and dilute hydrochloric acid. What were her observations in both the dishes?
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A)
In China dish I, a mixture is formed, where iron filings and sulphur powder can be seen separately. done
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B)
In China dish II, a new compound is formed, which is different from iron filings and dilute hydrochloric acid. done
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C)
A colourless and odourless gas comes out from China dish II. done
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D)
All the above observations are correct. done
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question_answer3)
Which of the following statements is/are incorrect?
I Centrifugation method can be used to separate butter from cream. |
II Coloured component of blue ink can be separated by evaporation. |
III Chromatography can be used to detect drugs in blood. |
IV Camphor can be separated from salt by crystallisation. |
A)
II only done
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B)
II and III only done
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C)
IV only done
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D)
II and IV only done
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question_answer4)
The boiling points of a few gases found in air are given below:
Element | Krypton | Neon | Nitrogen | Oxygen |
Boiling point \[\mathbf{({}^\circ C)}\] | -152 | -246 | -196 | -183 |
If liquid mixture is fractionally distilled, the order of gases distilling out is
A)
Krypton, Neon, Nitrogen, Oxygen done
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B)
Neon, Nitrogen, Oxygen, Krypton done
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C)
Nitrogen, Neon, Oxygen, Krypton done
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D)
Oxygen, Neon, Nitrogen, Krypton. done
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question_answer5)
Soham, a class 9 student mixed some iron filings and sulphur in a China dish and heated them strongly to obtain a residue.
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Which of the following is not a characteristic property of the residue?
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A)
It cannot be separated into sulphur and iron filings by normal physical methods. done
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B)
Its properties are completely different from iron and sulphur. done
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C)
Its composition is same throughout. done
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D)
Its appearance is different from iron and sulphur but it shows chemical properties of both iron and sulphur. done
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question_answer6)
Sheela heated a mixture of iodine and common salt by keeping an inverted funnel on it. After some time, she observed that
A)
White fumes come out from the mixture done
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B)
Violet particles deposit on the neck of the funnel done
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C)
White particles deposit on the neck of the funnel done
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D)
A gas with popping sound comes out. done
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question_answer7)
Geetika poured 20 g of salt into 200 mL of water in a beaker. She stirred the water to dissolve the salt completely. Then she heated the solution until it was reduced to half. How many grams of salt can be recovered from the remaining solution?
A)
\[\text{0 g}\] done
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B)
\[\text{10 g}\] done
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C)
\[\text{20 g}\] done
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D)
\[\text{40 g}\] done
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question_answer8)
The given chromatogram was obtained for proteins extracted from soya milk.
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The components present in protein extract are
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A)
W and X done
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B)
X and Y done
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C)
W and Y done
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D)
Y and Z done
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question_answer9)
Direction: Read the given passage carefully and answer the following questions.
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The constituents of a heterogeneous mixture are X, Y and Z. If mixture containing X and Y is taken, X can be separated using magnetic separation from Y. If mixture containing Y and Z is taken, the two can be separated using evaporation method.
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The different states of X, Y and Z respectively are
A)
Solid, Solid, Liquid done
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B)
Solid, Liquid, Solid done
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C)
All are liquids done
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D)
All are solids. done
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question_answer10)
Direction: Read the given passage carefully and answer the following questions.
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The constituents of a heterogeneous mixture are X, Y and Z. If mixture containing X and Y is taken, X can be separated using magnetic separation from Y. If mixture containing Y and Z is taken, the two can be separated using evaporation method.
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Which of the following identifies X, Y and Z correctly?
A)
Iron, salt, water done
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B)
Sulphur, carbon disulphide, water done
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C)
Gun powder, common salt, water done
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D)
Iodine, sand, alcohol done
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question_answer11)
What is the function of X in the given experimental set-up?
A)
To apply pressure to the mixture in distillation flask done
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B)
To allow only lower boiling component to escape done
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C)
To cool and condense the vapours done
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D)
To allow the water from the mixture to move out done
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question_answer12)
Sahil took a white solid from his teacher to find out its melting point. During the experiment, he found that the melting point was \[\text{160 }\!\!{}^\circ\!\!\text{ C}\]. But, the teacher told him that actual melting point of the solid is \[\text{150 }\!\!{}^\circ\!\!\text{ C}\]. What could be the reason for Sahil's observation?
A)
Melting point of a solid depends upon the procedure and the amount taken. done
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B)
Solids can have different melting points depending upon the method of storage. done
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C)
The solid contains some impurities mixed with the pure compound. done
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D)
If solid is heated strongly, the melting point increases. done
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question_answer13)
Natural water is impure and needs to be purified before this water can be supplied to homes for drinking purposes. The sequence of steps involved in purification of water is
A)
Filtration, sedimentation, decantation and aeration done
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B)
Sedimentation, loading, filtration and chlorination done
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C)
Chlorination, aeration, sedimentation and filtration done
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D)
Chlorination, filtration and distillation. done
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question_answer14)
Ms Mehta, a science teacher gave different mixtures to four groups of students to separate their components. Which group was not following the correct method?
A)
Group 1 was separating a mixture of ethyl alcohol and water by using separating funnel. done
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B)
Group 2 was separating a mixture of ammonium chloride and sodium chloride using sublimation. done
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C)
Group 3 was separating a mixture of iron pins and sand by using a magnet. done
clear
D)
Group 4 was separating mud particles suspended in water using sedimentation and decantation. done
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question_answer15)
Read the given passage and fill in the blanks by choosing an appropriate option.
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When a mixture of two ___i___ liquids having a difference of \[25{}^\circ C\] in their boiling points is to be separated, a ___ii___ is used which increases the ___iii___ surface area. As a result, when the vapours of both the liquids rise, the ___iv___ volatile liquid will condense while the vapours of ___v___ volatile liquid will rise.
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A)
B)
C)
D)
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question_answer16)
Study the given Venn diagram carefully.
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Which of the following colloidal systems correctly represent points 1, 2 and 3?
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A)
B)
C)
D)
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question_answer17)
Match column I with column II and select the correct option from the codes given below.
Column I | Column II |
(a) Sublimation | (i) Separation of water and \[\text{CC}{{\text{l}}_{4}}\] |
(b) Magnetic separation | (ii) Separation of \[\text{NaCl}\] from \[\text{KN}{{\text{O}}_{3}}\] |
(c) Distillation | (iii) Separation of benzene and aniline |
(d) Separating funnel | (iv) Separation of iron and sand |
(e) Fractional Crystallisation | (v) Separation of iodine and sand |
A)
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv), (e)-(v) done
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B)
(a)-(v), (b)-(iv), (c)-(iii), (d)-(i), (e)-(ii) done
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C)
(a)-(iv), (b)-(v), (c)-(ii), (d)-(i), (e)-(iii) done
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D)
(a)-(i), (b)-(ii), (c)-(iv), (d)-(v), (e)-(iii) done
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question_answer18)
Study the given flow chart and choose the correct statements.
(i) The property used to separate the mixture is solubility of different components in different solvents. |
(ii) Sulphur is soluble in carbon disulphide, salt in water and coal is insoluble in both. |
(iii) X is water and Y is carbon disulphide. |
A)
(i) and (ii) only done
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B)
(ii) and (iii) only done
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C)
(i) and (iii) only done
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D)
All are correct. done
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question_answer19)
Siddharth dissolved a mixture into water and then filtered it. Solid X was left behind as residue in the filter paper and solid Y was obtained by evaporating the filtrate to dryness. X and Y could be respectively
A)
Sodium hydroxide and calcium carbonate done
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B)
Calcium chloride and sodium carbonate done
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C)
Calcium carbonate and sodium chloride done
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D)
Sodium carbonate and calcium chloride. done
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question_answer20)
Which of the following statements about the given experimental set-up is/are incorrect?
I. It is used to separate a mixture of two or more miscible liquids for which the difference in boiling points is more than 25 K. |
II. It is used for the separation of different gases from air. |
III. It is used to separate acetone and water from their mixture. |
IV. It is based on the principle of repeated cooling and condensation of vapours by providing surface for the vapours. |
A)
I only done
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B)
III and IV only done
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C)
I and II only done
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D)
I and III only done
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