Chemistry · General Science · NDA

The relative atomic mass of boron (which exists in two isotopic forms ¹⁰B and ¹¹B) is 10.81. What will be the abundance of ¹⁰B and ¹¹B, respectively (consider a sample of 100 atoms)?

Which among the following are essential constituents of Portland cement?

Litmus, a well-known acid-base indicator, is derived from :

What is the oxidation state of Vanadium in $V_2O_5$?

Match List-I with List-II and select the correct answer using the code given below the Lists:

Water gas is a mixture of:

Which one among the following statements with reference to the properties of water is not correct?

Which one among the following compounds has a sweet and fruity smell?

What is the coordination number of Na⁺ and Cl⁻ ions in NaCl lattice?

Which one among the following is present in the nettle leaf hairs that causes burning pain?

Which one among the following is known as Milk of Magnesia?

Soap with water forms :

Which among the following is the correct composition of Borax?

Which one among the following oxides has the highest melting point?

Consider the following reaction:

Fe₂O₃(s) + 2Al(s) → 2Fe(s) + Al₂O₃(s)

Which of the following statements about the given reaction is NOT correct?

Match List I with List II and select the correct answer using the code given below the Lists:

Consider the following reaction:

2HgO $ \stackrel{\Delta}{\longrightarrow} $ 2Hg + O₂

The respective state of HgO, Hg and O₂ in the above reaction is

Match List I with List II and select the correct answer using the code given below the Lists:

Which among the following statements with respect to carbon is/are correct?

1. Carbon forms the basis for all living organisms and many things we use

2. Carbon shows tetra-valency and the property of catenation

3. Carbon forms covalent bonds with itself and other elements

4. Carbon forms compounds containing triple and tetra bonds between carbon atoms

Select the correct answer using the code given below: