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The molecular formula of an organic compound is $C_{48}{H}_{94}$. This compound belongs to the homologous series of :
(a) alkenes (b) aldehydes (c) alkynes (d) alkanes

(a) How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element? Explain your answer.

(b) What names were given by Mendeleev to the then undiscovered elements (i) scandium (ii) gallium, and (iii) germanium?

Name the alloys of zinc. State the composition, properties and uses of these alloys.

A gas $X$ is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas $Y.$ Identify $X$ and $Y.$

If chlorine, bromine and iodine form a Dobereiner's triad and the atomic masses of chlorine and iodine are 35.5 u and 127.0 u respectively, then the atomic mass of bromine is _____.

Which of the following is/are oxoacid of chlorine?

A separate purifier is used to ensure no ___ is passed into the catalytic chamber

Which concentrated acid oxidises sulphur directly to sulphuric acid? Write the equation for the same. What is the name of the process by which sulphuric acid is manufactured? Name the catalyst used in the process.

Give a reaction of the class of compoundthat undergoes electrolytic decomposition.

Which one of the following solutions would you use to test the pH of a given sample?

(1) blue litmus solution

(2) red litmus solution

(3) universal indicator solution

(4) mixture of red and blue litmus solution

Calculate the volume of air at STP, required to convert 300 mL of sulphur dioxide to sulphur trioxide. Air contains 21% oxygen by volume.

Wine contains

Which of the following process / processes release heat ?
(i) condensation (ii) vaporisation (iii) freezing (iv) melting

(a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

Number of oxygen atoms present in 1 gram of calcium carbonate are

Write the molecular formula of ethanol.

what happens at molecular level that magnetises a soft iron core when kept in a current carrying solenoid?please provide diagrams too.

Identify the following steps involved in silk production.

1. 
   

   The unwinding of silk threads from the cocoon

   
   


2. 
   

   Conversion of silk fibre into yarn

   
   


3. 
   

   Conversion of silk yarn into fabric
   
   

   
   

Which of the following complexes have correct name ?

Write the chemical formula of simplest ketone.

Which of these is the key compound used in the Contact process?

(NH₄)₂Cr₂O₇ $\stackrel{}{\to }$ N₂ + Cr₂O₃ + 4H₂O. What volume of nitrogen at STP, will be evolved when 63 g of ammonium dichromate is decomposed? (H = 1, N = 14, O = 16, Cr = 52)

The ionic radii of $A^{+}$ and $B^{-}$ ions are $0.98\times {10}^{-10}$ m and $1.81\times {10}^{-10}$ m. The coordination number of each ion in $AB$ is

Which of the following is the correct order of decreasing atomic radius

(i) LPG stands for liquefied petroleum gas. Varieties of LPG are marketed including a mixture of propane (60%) and butane (40%). If 10 litre of this mixture is burnt, find the total volume of carbon dioxide gas added to the atmosphere. Combustion reactions can be represented as:

C₃H_g(g) + 5O_2(g) → 3CO_2(g) + 4H₂O_(g)

2C₄H_10(g) + 13O_2(g) → 8CO_2(g) + 10H₂O_(g)



(ii) Calculate the percentage of nitrogen and oxygen in ammonium nitrate [Relative molecular mass of ammonium nitrate is 80, H = 1, N = 14, O = 16].

(b) The reaction: 4N₂O + CH₄ $\stackrel{}{\to }$ CO₂ + 2H₂O + 4N₂ takes place in the gaseous state. If all volumes are measured at the same temperature and pressure, calculate the volume of dinitrogen oxide (N₂O) required to give 150 cm³ of steam.

(N = 14, O = 16, C = 12, H = 1)

Li compounds are soluble in organic solvents because they are: