1.0 g of magnesium is burnt with 0.56 g of O₂ in a closed vessel. Which reactant is left in excess and how much?

• Mg, 0.16 g

• O₂, 0.16 g

• Mg, 0.44 g

• Mg, 0.44 g

12.

The pair of compounds that can exist together is 

• FeCl₃.SnCl₂

• HgCl₂,SnCl₂

• FeCl₂,SnCl₂

• FeCl₂,SnCl₂

Be²⁺ is isoelectronic with which of the following ions?

• H⁺

• Li⁺

• Na⁺

• Na⁺

Which of the following molecules has the maximum dipole moment?

• CO₂

• CH₄

• NH₃

• NH₃

Which one of the following species has the plane triangular shape?

• N₃

• NO₃^-

• NO₂^-

• NO₂^-

Magnetic moment 2.83 BM is given by which of the following ions?

(At. no.: Ti =22; Cr=24; Mn=25; Ni=28)

• Ti³⁺

• Ni²⁺

• Cr³⁺

• Cr³⁺

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10 mL of 1 M H₂SO₄.The percentage of nitrogen in the soil is

• 37.33

• 45.33

• 35.33

• 35.33

Which of the following organic compounds has same hybridization as its combustion product -(CO)₂?

• Ethane

• Ethyne

• Ethene

• Ethene

(I)H₂O₂ +O₃ --> H₂O +2O₂
(II) H₂O₂ +Ag₂O +--> 2Ag +H₂O +O₂
Role of hydrogen peroxide in the above reaction is respectively

• oxidising in (I) and reducing (II)

• reducing (I) and oxidizing in (II)

• reducing in (I) and (II)

• reducing in (I) and (II)

The reaction of aqueous KMnO₄ with H₂O₂ in acidic conditions gives.

• Mn⁴⁺ and O₂

• Mn²⁺ and O₂

• Mn²⁺ and O₃

• Mn²⁺ and O₃