Which of the following statements about hydrogen is incorrect?

(a)

Hydrogen ion, H₃O⁺ exists freely in solution.

(b)

Dihydrogen acts as a reducing agent.

(c)

Hydrogen has three isotopes of which tritium is the most common.

(d)

Hydrogen never acts as cation in ionic salts.

If a body of a fish contains 1.2 g hydrogen in its total body mass, if all the hydrogen is replaced with deuterium then the increase in body weight of the fish will be ______________

(a)

1.2 g

(b)

2.4 g

(c)

3.6 g

(d)

\(\sqrt{4.8}\)g

The cause of permanent hardness of water is due to _____________

(a)

Ca(HCO₃)₂

(b)

Mg(HCO₃)₂

(c)

CaCl₂

(d)

MgCO₃

A commercial sample of hydrogen peroxide marked as 100 volume H₂O₂, it means that _____________

(a)

1 ml of H₂O₂ will give 100 ml O₂ at STP

(b)

1 L of H₂O₂ will give 100 ml O₂ at STP

(c)

1 L of H₂O₂ will give 22.4 L O₂

(d)

1 ml of H₂O₂  will give 1 mole of O₂ at STP

For decolorisation of 1 mole of acidified KMnO₄, the moles of H₂O₂ required is ___________

(a)

\(\frac{1}{2}\)

(b)

\(\frac{3}{2}\)

(c)

\(\frac{5}{2}\)

(d)

\(\frac{7}{2}\)

The hybridisation of oxygen atom is H₂O and H₂O₂ are, respectively __________

(a)

sp and Sp³

(b)

sp and sp

(c)

Sp and Sp²

(d)

Sp³and Sp³

In solid ice, oxygen atom is surrounded _____________

(a)

tetrahedrally by 4 hydrogen atoms

(b)

octahedrally by 2 oxygen and 4 hydrogen atoms

(c)

tetrahedrally by 2 hydrogen and 2 oxygen atoms

(d)

octahedrally by 6 hydrogen atoms

The most abundant element in the universe is _________.

(a)

aluminium

(b)

mica

(c)

dihydrogen

(d)

nitrogen

_____________ is known as heavy hydrogen.

(a)

protium

(b)

deuterium

(c)

tritium

(d)

both a and b

The half life period of Tritium is ___________

(a)

12.33 secs

(b)

12.33 mins

(c)

12.33 hrs

(d)

12.33 years

___________ torches is/are used in cutting and welding of a steel.

(a)

Oxy acetylene

(b)

Oxy hydrogen

(c)

both a and b

(d)

neither a nor b

The conversion of atomic hydrogen to dihydrogen is a __________ change.

(a)

endothermic

(b)

exothermic

(c)

photochemical

(d)

nuclear

Hydrogen burns in air with a - flame.

(a)

light blusish

(b)

yellow

(c)

green

(d)

none of these

Hydrogen acts as a reducing agent and thus resembles ______________

(a)

halogens

(b)

chalogens

(c)

inert gases

(d)

alkali metals

In which of the following compounds does hydrogen has an oxidation state of -1?

(a)

CH₄

(b)

NH₃

(c)

HCl

(d)

CaH₂

Consider the following statements
1. Water has high dielectric constant.
2. Water has strong intra molecular hydrogen bonding 
3. Water is an Universal solvent
Which of the following statement(s) given above is are not correct

(a)

1 & 3

(b)

only 1

(c)

2 & 3

(d)

only 2

Match the list I with List II and select the correct answer using. the code given below the lists.

List I		List II
A	Calcium hydrogen carbonate	1	Permanent hardness
B	Calcium chloride	2	Chelating
C	Sodium aluminium  silicate	3	Temporary hardness
D	EDTA	4	Ion exchange method

(a)

A	B	C	D
1	3	2	4

(b)

A	B	C	D
4	3	1	2

(c)

A	B	C	D
3	1	4	2

(d)

A	B	C	D
2	1	4	3

The structure of water molecule is __________

(a)

bent

(b)

tetrahedral

(c)

distorted octahedral

(d)

trigonal bi pyramidal

FeSO₄ contains _________ molecules of water of hydration.

(a)

5

(b)

7

(c)

10

(d)

12

Hardness of water cannot be removed by ______________

(a)

treating with washing soda

(b)

adding calgon

(c)

boiling

(d)

addition of chlorine