Commercial sample of H₂O₂ is labeled as 10 V. Its % strength is nearly

• 3

• 6

• 9

• 12

The reagent with which the following reaction is best accomplished is

• H₃PO₂

• H₃PO₃

• H₃PO₄

• NaHSO₃

The order of decreasing ease of abstraction of hydrogen atoms in the following molecule

• H_a > H_b > H_c

• H_a > H_c > H_b

• H_b > H_a > H_c

• H_c > H_b > H_a

In the hydrolysis of an organic chloride in presence of large excess of water

RCl + H₂O → ROH + HCl

• molecularity and order of reaction both are 2

• molecularity is 2 but order of reaction is 1

• molecularity is 1 but order of reaction is 2

• molecularity is 1 but order of reaction is also 1

Ortho and para hydrogens have

• Identical chemical properties but different physical properties 

• Identical physical and chemical properties 

• Identical physical properties  but different chemical properties 

• Different chemical and physical properties 

In which of the following molecules is hydrogen bridge bond present?

• Water

• Inorganic benzene

• Diborane

• Methanol

Blackened oil painting can be restored into original form by the action of

• Cl₂

• BaO₂

• H₂O₂

• MnO₂

Which gas is evolved by the treatment of magnesium with very dilute solution of HNO₃?

• N₂

• NO₂

• H₂

• H₂O

How many neutrons are present in tritium nucleus?

• 2

• 3

• 1

• 0

The high boiling point of water is due to which reason:

• co-ordinate bonding

• covalent bond

• electrostatic force of attraction

• hydrogen bonding