CHEMISTRY

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1 In the group of the alkali metals the degree of hydration-------- down the group.
decreases
increases
is constant
has no fixed pattern

2 Which of these statements is not true?
liquid ammonia is is used to form carbides
All metals react with carbon to form carbides
lithium reacts with carbon to form ionic carbides
Acetylene is neccesary for the formation of some carbide

3 All these are consequences of the sole valence electron in alkali metals except ------
the metals are soft
good conduction of electricity
good conduction of heat
the silvery luster

4 Which of these statements is not true of metallic elements?
they are ductile
they have lustre
They form acidic oxides
they are malleable

5 All these are types of metal lattices except-------
body-centred cubic
bexagonal
hexagonal
cubic close packed

6 Sodium Hydride is an example of ------- hydride
covalent
ionic
metallic
non-stoichiometric

7 Which of these statements is not true of metallic hydrides?
they are volatile
they are deficient in hydrogen
most have metallic appearance
They are all conductors of heat

8 Silt is an example of ------ hydride
superior
covalent
metallic
ionic

9 When alkali metals are heated with hydrogen they form--------hydrides
covalent
ionic
metallic
non-stoichiometric

10 ______types of hydride compounds can be formed depending on the electronegativity of the elements
1
2
3
4

11 Hydrogen may be used for all but one of the following
Synthesis of ammomia
hydrogenation of oil
manufacture of methanol
synthesis of zinc

12 Hydrogen may not be advantagous as a fuel because-------
It has unlimited quantities in the sea
It is pollution free
It can be stored and used when needed
it is a secondary source of energy

13 Hydrogen may be used for all but one of the following.
synthesis of zinc
hydrogenation of oil
manufacture of methanol
Synthesis of ammomia

14 Which if these is not a property of hydrogen?
it is colourless
it has a pungent smell
it can be oxidized to water
It reduces sulphur to hydogen sulphide

15 Hydrogen can be obtained economically as a bi-product in the electrolysis of ------
brine
water
sodium hydroxide
platinium

16 All these can be used as raw materials for the production of oxygen except
coke
carbon(II)oxide
steam
nitrogen

17 Which of the isotopes of hydrogen is radioactive?
Protium
Deutrium
Tritium
Neutrium

18 __________ forms an oxide also known as heavy water.
Protium
Deutrium
Tritium
Neutrium

19 Which of these is not an isotope of hydrogen?
Protium
Deutrium
Tritium
Neutrium

20 In the periodic table,period 6 contains ------ elements
32
16
24
8

  • CHEMISTRY -

    no 2 is b

  • CHEMISTRY -

    Which of these statements is not true?
    lithium reacts with carbon to form ionic carbides,
    Acetylene is neccesary for the formation of some carbide
    liquid ammonia is is used to form carbides
    All metals react with carbon to form carbides

  • CHEMISTRY -

    the ans to no3 is a

  • CHEMISTRY -

    the silvery luster

  • CHEMISTRY -

    1a 2b 3a4b 5c

  • CHEMISTRY -

    No 4 ¶§ C

  • CHEMISTRY -

    19. C

  • CHEMISTRY -

    ADCCBBCADC ACBBDCADA.

  • CHEMISTRY -

    Royal please for God sake is that answer true and more also is 19 answer you post

  • CHEMISTRY -

    Royal please for God sake is that answer true and more also is 19 answer you post

  • CHEMISTRY -

    royal if u are not sure if it is the right answer don't post it

  • CHEMISTRY -

    no 17 is c

  • CHEMISTRY -

    Ionization energy _____________ down the group within the alkali metals.

  • CHEMISTRY -

    1a 2c 3b 4a 5d

  • CHEMISTRY -

    No 20 is B

  • CHEMISTRY -

    NO 11d, 13a, 15a

  • CHEMISTRY -

    14-b, 15-a, 16-b, 18-b, 19, d, 20-a

  • CHEMISTRY -

    Ionization energy increases down the group

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