Basic chemistry

on 22 Jan 2019, 10:30AM
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1Element having atomic number 29 is related to-

a) d-Block
b) s-Block
c) p-Block
d) f-Block

2 Which acid is known as ‘King of chemicals’?

a) H₂SO₄
b) HCI
c) HNO₃
d) H₃PO₄

3What is the pH of water?

a) 5
b) 7
c) 3
d) 1

4 Atomic number of which of the following elements is greater than that of silicon____

a) Aluminium
b) Sodium
c) Magnesium
d) Sulphur

5 What is the common name of sodium carbonate?

a) Limestone
b) Lime
c) Marble
d) Washing soda

6 Phenomenon of Radioactivity was discovered by-

a) Rutherford
b) Becquerel
c) Curle
d) Suri

7 Which of the following is a chemical formula of quicklime?

a) CaO
b) CaO₂
c) Ca₂CO₃
d) Ca₂O

8 The lightest radioactive element is

a) Deuterium
b) Tritium
c) Polonium
d) Uranium

9 What is the common name of Sodium bicarborate?

a) Washing powder
b) Baking soda
c) Plaster of paris
d) Fly ash

10How many lone pair of electrons are present in N2?

a) 1
b) 3
c) 4
d) 2

11 At room temperature, the metal that remains liquid is :

a) Platinum
b) Mercury
c) Lead
d) Zinc

13 Which metal is protected by the layer of its own oxide?

a) Silver
b) Aluminium
c) Iron
d) Gold

14 Which one of the following metals cannot be used as an electromagnet?

a) Iron
b) Copper
c) Nickel
d) Cobalt

15 What is Asbestos?

a) Alumina
b) Calcium magnesium silicate
c) Calcium silicate
d) Magnesium silicate

16 which one of the following is used in Pencils?

a) Charcoal
b) Graphite
c) Lead
d) Phosphorus

17 Non – metal found in Liquid State

a) Bromine
b) Bromine
c) Nitrogen
d) Fluorine

Most important

18 What is the name of the acid in an ant’s sting?

a) Acetic acid
b) Citric acid
c) Formic acid
d) Lactic acid

19 Hydrogen was discovered by

a) Boyle
b) Charles
c) Cavendish
d) Priestley

20 H₂O is liquid and H₂S is a gas because

a)Oxygen is less electronegative than sulphur
b) Atomic radius of oxygen is less than that or sulphur
c) Oxygen forms stronger
hydrogen bond that sulphur

d) Atomic radius of oxygen is greater than that of sulphur

21What are the main components of bronze alloy?

a) Copper and Zinc
b) Copper Zinc and Nickel
c) Copper and Tin
d) Copper and Nickel

22The process of heating of Rubber with sulphur to increase its quality is known as

a) Acceleration
b) Galvanization
c) Vulcanisation
d) Sulphonation

23An Emulsion is a colloid of a

a) Gas in a Liquid
b) Liquid in a gas
c) Liquid in a Liquid
d) Gas in a Solid

24Which one of following is used for sun glasses?

a) Pyrex glass
b) Crookes glass
c) Crystal glass
d) None of the above

25 Which of the following is used for ripening of fruits?

a)Methylene
b) Methane
c) Ethylene
d) Acetone

26 Pasteurization is a process in which milk is heated at-

a) at 60⁰C for 10 min
b) 63⁰C for 20 min
c) 63⁰C for 30 min
d) 72⁰C for 10 min

27 Which of the following gases is produced due to incomplete combustion of fuel?

a) Carbon dioxide
b) Carbon monoxide
c) Methane
d) Ethane

28 Oxygen is a –

a) Reducing agent
b) Combustion nourishing
c) Constituent of all gas
d) Inflammable gas

29 Soda water contains

a) H₂
b) CO₂
c) NO₂
d) SO₂

30 Dry powder fire extinguisher contains

a) Sand
b) Sand and sodium bicarbonate
c) Sand and sodium carbonate
d) Fluorine

31 In deep see diving, divers use a mixture of gases consisting of oxygen and

a) Argon (Ar)
b) Helium (He) and nitrogen (N)
c) Helium (He)
d) Hydrogen (H)

32 Which one of the following is known as the brown coal?

a) Anthracite
b) Lignite
c) Bituminous
d) Coke

33 Which metal is extracted from sea water?

a) Potassium
b) Magnesium
c) Aluminium
d) Beryllium

Questions

34 Combustion is a-

a) Biological Process
b) physical Process
c) Physical and chemical process
d) Chemical Process

35 Which of the following gas was leaked in the Bhopal Gas tragedy in December 1984?

a) Methyl isochlorate
b) Methyl isocyanate
c) Methyl phosphate
d) Methyl isopropate

36 What are isobars?

a)Elements with different
atomic number but same
mass number

b) Elements with same atomic number but different mass number
c) Elements with different atomic number and different mass number
d) Elements with same atomic number and same mass number

36 Which one of the following is main constituent of LPG?

a) Butane
b) Methane
c) Ethane
d) Propane

37 How are 'Cations' formed?

a) Removal of electron
b) Addition of electron
c) Addition of proton
d) Removal of proton

38 ⁴⁰Ar₁₈ ⁴⁸K₁₉ ⁴⁰Ca₂₀ are called?

a) Isobars
b) Isotones
c) Isotopes
d) None

39 How are 'anions' formed?

a) Removal of electron
b) Addition of electron
c) Addition of proton
d) Removal of proton

41Which of the following can not be formed

a) He
b) He⁺
c) He₂
d) He⁺²

42 Match Stick uses the allotrope of Phosphorous

a) Any Phosphorous
b) Red Phosphorous
c) Red Phosphorous
d) Purple Phosphorous

43 A white solid ‘A’ gives off a gas which turns lime water milky. The residue is yellow but turns white on cooling. Now the solid is

a) Zinc sulphate
b) Zinc carbonate
c) Lead sulphate
d) Lead carbonate

44 Which of the following will displace Hydrogen from acids to form salts?

a) S
b) Na
c) Ag
d) P

45 Liquid Chemical used for artificial rain or cloud seeding

a) Silver iodide (Agl)
b) Sodium chloride (NaC1)
c) Dry ice (solid Co2)
d) All the these

46 Ozone is represented as

a) Phosphorous
b) O₃
c) Phosphorous
d) Phosphorous

47 Match

a) H₂O₂
b) Phosphorous
c) Cl₂O
d) N₂O

48 Which gas is used as a fire extinguisher?

a) Carbon monoxide
b) Carbon dioxide
c) Carbon suboxide
d) Sulphur dioxide

49 The gas which turns into Liquid at the Lowest temperature among the following is

a) Oxygen
b) Hydrogen
c) Helium
d) Nitrogen

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