Q.1
Which one element has the highest electronegativity value
Q.2
The element with highest ionization potential is
Q.3
Antacid tablets consist of
Q.4
The gas which is mainly responsible for the green house effect is:
Q.5
Chernobyl disaster is the result of pollution by
Q.6
Which one is the simplest aromatic hydrocarbon?
Q.7
The chemical name of rat poison is
Q.8
Which of the toxic heavy metals is found in modern tannery industries ?
Q.9
Detergents used for cleaning clothes and utensils contain
Q.10
Which one of the following chemicals helps in fruit ripening?
Q.11
Sulphuric acid is
Q.12
Which of the following has no unit?
Q.13
‘Aerosol’ is known as
Q.14
The antiseptic compound present in dettol is
Q.15
Which of the following chemicals is used in photography ?
Q.16
Which of the following vegetable oils does not contain essential fatty acids ?
Q.17
The example of oligosaccharide is
Q.18
Number of hydrogen atoms in a Glucose molecule is
Q.19
The residue left after extracting juice from sugarbeet and sugarcane is called
Q.20
Nitrogen is an essential constituent of all :
Q.21

The inert gases are ____ in water

  • sparingly soluble
  • insoluble
  • soluble
  • None of these
Q.22

The gas used in the manufacture of vanaspati from vegetable oil is

  • hydrogen
  • oxygen
  • nitrogen
  • carbon dioxide
Q.23

The nucleus of a hydrogen atom consists of

  • 1 proton only
  • 1 proton + 2 neutron
  • 1 neutron only
  • 1 electron only
Q.24

The method that cannot be used for removing permanent hardness of water is

  • adding sodium carbonate
  • distillation
  • adding caustic soda
  • boiling
Q.25

The number of waves in n x 10th Bohr's orbit are

  • n2
  • n
  • n-2
  • n3
Q.26

The main use of salt in the diet is to

  • make the taste of food better
  • produce in small amounts the hydrochloric acid required for the digestion of food
  • ease the process of cooking
  • increase the solubility of food particles in water
Q.27

The ionic radii of N3-, O2-, F- and Na+ follows the order

  • N3- > O2- > F- > Na+
  • N3- > Na+ > O2- > F-
  • Na+ > O2- > N3- > F-
  • O2- > F- > Na+ > N3-
Q.28

The heat required to raise the temperature of body by 1 K is called

  • specific heat
  • thermal capacity
  • water equivalent
  • None of the above
Q.29

The metal does not give H2 on treatment with dilute HCL is

  • Ag
  • Zn
  • Fe
  • Ca
Q.30

The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

  • 3 billion years
  • 100 years
  • 0.01 minute
  • 13 days
Q.31

The mass of one Avogadro number of helium atom is

  • 1.00 gram
  • 4.00 gram
  • 8.00 gram
  • 4 x 6.02 x 1023 gram
Q.32

The monomer of polythene is

  • vinyl chloride
  • ethylene
  • ethyl alcohol
  • None of the above
Q.33

The graphite rods in the nuclear reactor

  • react with U to release energy
  • produce neutrons
  • undergo combustion which triggers the nuclear fission
  • convert fast moving neutrons into thermal neutrons
Q.34

The nuclear particles which are assumed to hold the nucleons together are

  • electrons
  • positrons
  • neutrons
  • mesons
Q.35

The number of g-molecule of oxygen in 6.x 1024CO molecules is

  • 1 gram of molecule
  • 0.5 gram of molecule
  • 5 gram of molecule
  • 10 gram of molecule
Q.36

The gas used for artificial ripening of green fruit is

  • ethylene
  • ethane
  • carbon dioxide
  • acetylene
Q.37

The items amenable to detection by soft x-rays are

  • contrabands
  • lead in bullets
  • narcotics
  • genuine coins from counterfeit coins
Q.38

The luster of a metal is due to

  • its high density
  • its high polishing
  • its chemical inertness
  • presence of free electrons
Q.39

The first metal used by man was

  • iron
  • copper
  • gold
  • bronze
Q.40

The mass of P4O10 that will be obtained from the reaction of 1.gram of P4 and 5.of oxygen is

  • 2.05 gram
  • 3.05 gram
  • 4.05 gram
  • 5.05 gram
Q.41

The most extensive, commercially useful source of thorium as monazite sand occurs in India at

  • Orissa coast
  • Travancore coast
  • West Bengal coast
  • Gujarat coast
Q.42

Zone refining is used for the purification of

  • Au
  • Ge
  • Ag
  • Cu
Q.43

The material which can be deformed permanently by heat and pressure is called a

  • thermoplastic
  • thermoset
  • chemical compound
  • polymer
Q.44

The number of water molecules present in a drop of water (volume 0.ml) at room temperature is

  • 1.568 x 103
  • 6.023 x 1019
  • 4.84 x 1017
  • 6.023 x 1023
Q.45

The hydronium ion is

  • H+
  • HO -
  • H2+
  • H3O+
Q.46

The octane number of zero is assigned to

  • 2-methyl octane
  • n-heptane
  • iso-octane
  • 3-methyl octane
Q.47

The main active constituent of tea and coffee is

  • nicotine
  • chlorophyll
  • caffeine
  • aspirin
Q.48

The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

  • cineole
  • engenol
  • geraniol
  • limonene
Q.49

The mass number of a nucleus is

  • always less than its atomic number
  • the sum of the number of protons and neutrons present in the nucleus
  • always more than the atomic weight
  • a fraction
Q.50

The most malleable metal is

  • platinum
  • silver
  • iron
  • gold
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