chemistry notes for ssc cgl pdf in english

Anonymous 11:09 am 0

chemistry notes for ssc cgl pdf in english

1 Q) Which one of the following is used as a mordant in dyeing and tanning
industry?
(a) Magnesium Oxide
(b) Magnesium chloride
(c) Magnesium sulphate
(d) Magnesium carbonate

2 Q) “The gas used in a refrigerator is ”
(a)cooled down on flowing
(b)heated up on flowing
(c)cooled down when compressed
(d)cooled down when expanded

3 Q) Consider the following statements. Loss of beta- particle is equivalent to
I. increase in one proton only.
II. decrease in one neutron only.
Which of the statements given above is/are correct?”
(a) Only I
(b) Only II
(c)Both I and II
(d) Neither I nor II

4 Q) Which one of the following oxides is the most abundant in Earth crust?
(a) Na2O
(b) CaO
(c) MgO
(d) SiO2

5 Q) The flavour of apple is mainly due to which one of the following?
(a) Formalin
(b) Ethanol
(c) Benzene
(d) Benzaldehyde

6 Q) Which one among the following statements is correct?
(a) All bases are alkalis
(b) None of the basis is alkali
(c) There are no more bases except the alkalis
(d) All alkalis are bases but all bases are not alkalis

7Q) KO2 (Potassium superoxide) is used in oxygen cylinders in space and
submarines because it
(a) eliminates moisture
(b) absorbs C02
(c) produces Ozone
(d) produces C02

8 Q) Scuba divers are at high risk due to high concentration of dissolved gases
while breathing air at high pressure under water. The tanks used by Scuba divers
are filled with
(a) air diluted with helium
(b) 02
(c) N2
(d) a mixture of nitrogen and helium

9 Q) “Which one of the following is correct? Setting of plaster of Paris is ”
(a) dehydration
(b) oxidation with atmospheric oxygen
(c) hydration leading to another hydrate
(d) combination with atmospheric carbon dioxide

10 Q) Assertion (A) On mixing with water, plaster of Paris hardens.
Reason (R) By combining with water, plaster of Paris is converted into gypsum.
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

11 Q) “The bleaching action of chlorine occurs in the presence of ”
(a) moisture
(b) sunlight
(c) pure oxygen
(d) pure sulphur dioxide

12 Q) Which one among the following polymers is re-synthesised from the
naturally occurring polymer?
(a) Kevlar
(b) Teflon
(c) Rayon
(d) Cellulose

13 Q) Food wrapped in newspaper is likely to get contaminated with
(a) aluminium
(b) lead
(c) iron
(d) magnesium

14 Q) Which one of the following has been producing/can produce light by a
chemical change?
(a) Electric bulb
(b) Moon
(c) Sun
(d) Lightning and thunder

15 Q) Which one of the following chemical compounds is responsible for the
stimulation of tear glands by the onion?
(a)A phosphate compound
(b)A nitrate compound
(c)A sulphide compound
(d)A chloride compound

16 Q) “Many communities put salt on their roads after a snowfall, Why? ”
(a)To enhance the freezing and hardening of snow
(b)To control the slipping of vehicles
(c)To keep the melted snow from refreezing
(d)None of the above

17 Q) Assertion (A) All liquids are conductors of Electricity.
Reason (R) Under the condition of low pressure and high voltage, liquids can be
made conducting.”
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

18 Q) Which one among the following would expand the most on being heated?
(a) Water
(b) Air
(c) Alcohol
(d) Glass

19 Q) “Consider the following statements
I. Glass wool has tensile strength greater than steel,
II. Glass wool is fire powder.
III. Glass wool has high electrical conductivity and absorbs moisture.
IV. Glass wool is used to prepare fire glass.
Which of the statements given above are correct?”
(a)I, II, III and IV
(b) I, II and III
(c) I, II and IV
(d) III and IV

20 Q) Why hard water does not give lather with soap?
(a) Hard water contains calcium and magnesium ions, which form precipitate with
soap
(b) Hard water contains sulphate and chloride ions, which form precipitate
(c) pH of hard water is high
(d) pH of hard water is less

21 Q) The most abundant metal in the Earth’s crust is
(a) Si
(b) Fe
(c) Al
(d) Cu

22 Q) If four balloons A, B, C and D are filled with hydrogen, oxygen, helium and
nitrogen gases respectively and left in air, which balloon reaches to the highest
distance from the Earth?.
(a) Balloon A
(b) Balloon B
(c) Balloon C
(d) Balloon D

23 Q) Which one of the following is used in the preparation of antiseptic solution?
(a)Potassium nitrate
(b)Iodine
(c)Iodine chloride
(d)Potassium chloride

24 Q) Contact lenses are made from
(a) polyvinyl chloride
(b) polystyrene
(c) Teflon
(d) lucite

25 Q) Which one among the following substances evolved heat when dissolved in
water?
(a) Glucose
(b) Fructose
(c) Quick lime
(d) Salt peter

26 Q) The biological specimens in laboratory are preserved in the glass containing
formalin. What is the “formalin”?
(a)An aqueous solution of H2S04
(b)An aqueous solution of HNOa
(c)An aqueous solution of formaldehyde
(d)Concentrated solution of HNOa

27 Q) “Consider the following statements
I. Photochromatic lenses darken on exposure to ultraviolet light.
II. Photochromatic properties is due to embedded microcrystalls of silver
chloride in the glass.
Which of the statements given above is/are correct?.”
(a)Only I
(b) Only II
(c)Both I and II
(d) Neither I nor II

28 Q) Match the Following
List 1 (Names) List II (Compounds)
A. Baking soda 1. Sodium nitrate
B. Washing soda 2. Calcium hydroxide
C. Chile saltpeter 3. Sodium carbonate
D. Slack lime 4. Sodium bicarbonate
(a) 2 4 3 1
(b) 2 3 4 1
(c) 4 3 1 2
(d) 4 1 3 2

29 Q) Match the Following
List 1 (Polymers) List II (Monomers)
A. Nylon-6 1. para-phenylenediamine + Terephthaloyl chloride
B. Kevlar 2. Caprolactum
C. Nylon-66 3. Hexamethylene diamine + Adipic acid
D. Bakelite 4. Phenol + Formaldehyde
(a) 2 1 3 4
(b) 2 3 4 1
(c) 3 4 2 1
(d) 3 1 2 4

30 Q) The rusting of iron nail
(a) decreases it weight
(b) increases its weight
(c) does not affect weight but iron is oxidised
(d) does not affect weight but iron is reduced

31 Q) Which one of the following is the hardest alkali metal?
(a) Li
(b) K
(c) Na
(d) Cs

32 Q) “What is the role of positive catalyst in a chemical reaction? ”
(a) It increases the rate of reaction
(b) It decreases the rate of reaction
(c) It increases the yield of the products
(d) It provides better purity of the products

33 Q) The pH of fresh groundwater slightly decreases upon exposure to air because
(a) carbon dioxide from air is dissolved in the water
(b) oxygen from air is dissolved in the water
(c) the dissolved carbon dioxide of the groundwater escapes into air
(d) the dissolved oxygen of the groundwater escapes into air

34 Q) What is the purpose of adding baking soda to dough?.
(a)To generate moisture
(b)To give a good flavour
(c)To give a good colour
(d)To generate carbon dioxide

35 Q) Which one among the following agents is added to domestic LPG cylinder to
help in the detection of gas leakage?
(a) Methano
(b)Ethanol
(c) Thioethanol
(d)Chloroform

36 Q) To meet its rapidly growing energy demand, some opine that India should
pursue research and development on thorium as the future fuel of nuclear energy.
In this context, what advantage does thorium hold over uranium?
1. Thorium is far more abudant in nature than uranium
2. On the basis of per unit mass of mined mineral, thorium can generate more
energy compared to natural uranium.
3. Thorium produces less harmful waste compared to uranium.
Which of the statement (s) given above is/are correct?”
(a) Only 1
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3

37 Q) Which one among the following will you put into pure water in order to pass
electric current through it?
(a) Kerosene
(b) Mustard oil
(c) Sugar
(d) Lemon juice

38 Q) Which one of the following is the metallurgical operation in which a metal is
obtained in a fused state?
(a) Calcination
(b)Roasting
(c) Froth floatation
(d)Smelting

39 Q) “Carbonated beverages such as soft drinks and soda water contains mainly ”
(a) carbon dioxide
(b) calcium carbonate
(c) calcium hydroxide
(d) potassium carbonate

40 Q) Assertion (A) Nitric acid is used in the production of fertilizers.
Reason (R) Sulphuric acid is used in the production of explosive.”
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

41 Q) Which one among the following when dissolved in water give hissing sound?
(a) Limestone
(b)Sodalime
(c) Slaked lime
(d)Quick lime

42 Q) “Consider the following substances I. Heavy Water II. Graphite
Which of the substances given above is/are used as a moderator in a nuclear
reactor? ”
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II

43 Q) Which of the following pairs of chemical compounds has the potential for
carbon capturing by chemical process to reduce the global warming?
(a)Potassium oxide and sodium oxide
(b)Magnesium oxide and calcium oxide
(c)Magnesium oxide and potassium oxide
(d)Calcium oxide and potassium oxide

44 Q) Assertion (A) The nuclear fusion reaction releases less energy than the fission
reaction.
Reason (R) The nuclear fusion reaction takes place in the sun and other stars.
(a)Both A and R are true and R is the correct explanation of A
(b)Both A and R are true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

45 Q) “Consider the following gases
I. Water vapour
II. Nitrous oxide
III. CFC
IV. Methane
Which of the gases given above are “Green House Gases (GHGs)”? ”
(a) All of these
(b) I, II and III
(c) II and III
(d) II and IV

46 Q) Electronegativity is the ability of an atom in a chemical compound io attract
shared electrons towards itself where as Electron Gain Enthalpy is the amount of
energy released when an isolated neutral gaseous atom of the element takes up
extra electron to form a uni-negative gaseous ions, also called electron affinity. tell
the element with highest electronegavity and the one with highest electron
affinity?
(a) Fluorine, Chlorine
(b) Chlorine, fluorine
(c) Iodine, Fluorine
(d) Fluorine, fluorine

47 Q) Match the Following
List 1 List II
(Elements) (Colour on flame)
A. Barium 1. Yellow
B. Sodium 2. Greenish
C. Silver 3. Turns black
D. Lead Codes 4. Apple green
(a) 2 4 3 1
(b) 2 3 4 1
(c) 4 3 1 2
(d) 4 1 3 2

48 Q) Making of chappathi is based on
(a) Graham’s law
(b) Henry’s law
(c) Charles’ law
(d) Boyle’s law

49 Q) The hair dye available in the market contains two bottles, one containing dye
and other containing hydrogen peroxide. The bottles are mixed before applying the
dye. The function of hydrogen peroxide is
(a) to dilute the dye
(b) to oxidise the dye to give desired colour
(c) to reduce the dye to give desired colour
(d) to acidify the dye solution

50 Q) From which one among the following water source, the water is likely to be
contaminated with fluorine?
(a) Ground water
(b) Rain water
(c) River water
(d) Pond water

click here get answer key pdf file download