Question 1 of 20 1,623 total questions
Which of the following statements is not true of halogens?
A they exist in different physical states
B they exist as diatomic molecules
C their ionic radii decrease down the group
D their melting and bolling points increase down the group
Atom \(^{234} _{88} Q\) decay by alpha emission to give an atom R. The atomic number and mass number of atom R are respectively
A 86 and 230
B 87 and 234
C 88 and 233
D 90 and 238
What is the atomic number of an element whose cation Y+ has the electronic configuration 1s2 2s2 2p6 ?
The valence electrons in a chloride ion are [17 CI]
A 2p electrons only
B 3s and 3p electrons only
C 3p and 3d electrons only
D 3p electrons only
Find the number of neutrons in an atom represented by 4521 X.
The mass spectrometer can be used to measure mass of
A an atom
B an electron
C a proton
D a neutron
Which of the these metals will not liberate hydrogen from dilute HCI?
A Copper
B Iron
C Magnesium
D Zinc
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
A 2.24 dm3
B 5.60dm3
C 11.20dm3
D 44.80dm3
Pig-iron is brittle because it contains
A a high percentage of carbon as impurity
B calcium trioxosilicate (IV)
C unreacted haematite
D undecomposed limestone
The following substances are heavy chemicals except
A sodium trioxocarbonate (IV)
B tetraoxosulphate (VI) acid
C lead (lV) tetraethyl
D sodium hydroxide
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
A Decantation
B Distillation
C Evaporation
D Filtration
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
A l and ll only
B l and lll only
C l, ll and lll only
D l, ll, lll and lV
Glucose reduces Fehling's solution on warming to
A copper (l) oxide
B copper (ll) oxide
C copper (l) chloride
D copper (ll) hydroxide
Which of the following compounds reacts readily with sodium to liberate hydrogen?
A CH3 CH2 CH3
B CH3 COOH
C CH3 CH2 CHO
D CH3 CH(OH)CH3
Consider the reaction below: Vegetable oil \(\frac{H2;NI catalyst}{High temperature}\) product. The reaction is applied in the manufacture of?
A drugs
B margarine
C paraffin wax
D soapy detergents
Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula
A Cn H2n
B Cn H2n
C Cn H2n+2
D Cn H2n-2
Alkenes undergo the following reactions except
A addition
B hydration
C polymerization
D substitution
Which of the following pairs of substances can be distinguished by use of NaHCO3 solution?
A CH 3 CH2 OH and HCOOCH3
B CH 3 CH2 OH and CH3 COOH
C CH3 COOH and HCOOH
D CH 3 CH2 OH and CH3 OH
The complete hydrogenation of C 6 6 in the presence of nicked catalyst at 200o C gives
A C6 H8
B C 6 H10
C C 6 H 12
D C 6 H 14
Which of the following substances is suitable solvent for perfumes?
A Benzene
B Ethanol
C Turpentine
D Water
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