Question # 1

In the periodic table which of following trend is correct across the periods

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Electronic affinity decrease

Electropositive character increases

Electronegative character decreases

Non-metallic nature increase

When sodium hydride is electrolyzed, hydrogen is liberate:

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at anode

at cathode

in electrolyte

none of all

Point out one of these that does not reflect the periodicity of the elements:

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ionization potential

electronegativity

bonding behavior

neutron/proton ratio

The periodic table consists of:

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7 horizontal an 7 vertical series

8 horizontal and 7 vertical series

7 horizontal and 18 vertical series

8 horizontal and 18 vertical series

Two elements whose electronegativities are 1.2 and 3.0, the bond formed between them would be

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Ionic

Covalent

Coordinate

Metallic

At 90°C, pure water the [H₃O⁺] = 10^-6mol L^-1. The value of k_wat 90°C is

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10^-6

10^-8

10^-12

10^-14

which of the following group may contain a metalloid?

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IA

IIA

VIA

IIA

Number of elements present in 5^th period is

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8

18

32

24

The elements with atomic numbers 9, 17, 35, 53, 85 and all

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Noble gases

Halogens

Heavy metals

Light metals

Buffers having pH less than 7 are made

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mixture of weak acid + salt of it with strong base

mixture of weak acid + salt of it with weak base

mixture of weak base + salt of it with strong acid

mixture of weak base + salt of it with weak base

In a chemical reaction equilibrium is said to have been established when:

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Rate of opposing reactions are equal

Rate constants of opposing reactions are equal

Opposing reactions stop

Concentration of reactants and product are equal

pH of the human blood which is essentially maintained constant due to carbonates, bicarbonates, phosphates etc, is

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7.00

7.25

7.35

7.47

The chemical characteristics of elements in each horizontal row in the periodic table are:

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similar

different

gradually variable

identical

Which of the following is different from other three oxides

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MgO

SnO

ZnO

PbO

A solution has pH = 0, its H⁺ion concentration is

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1 x 10^-14

1 x 10¹⁴

1 x 10¹

1

The defects in the Mendeleev's Periodic table is/are:

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in spite of their different properties, alkali metals and coinage metals have been grouped together

K(at.wt.39.1)has been placed after argon (at.wt.39.9)

similar elements lime Cu and Zn have been placed different groups

all above statement are correct,

Mendeleev s periodic table has number of groups and number of periods

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6,7

8,7

8,12

7,8

pH of water is 7, if 0.01 M NaOH is added, than its pH is

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12

14

zero

10

Which of the following electronic configuration represents an inert gas?

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2, 8, 2

2, 8, 1

2, 1, 7

2, 8, 8

The element with highest electron affinity among the halogen is

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F

CI

Br

I

An atom with high electronegativity has

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Large size

High ionization potential

Low electron affinity

Low ionization potential

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