Archives

From which mineral silicon is obtained?

Silicon is the second (27.7 % by mass) most abundant element on the earth’s crust and is present in nature in the form of silica and... View Article

Which one of the following is an extensive property? a. Volume b. Surface tension c. Viscosity d. Density

Answer: (a) Volume Volume depends upon the mass of the substance, hence it's an extensive property.... View Article

In ZnO + C = Zn + CO, which substance is oxidized and reduced?

In ZnO + C ---> Zn + CO, Carbon is oxidized (due to loss of electrons) and Zinc is reduced (due to gain in electron).... View Article

Which one of the following is aromatic? (a) Cyclopentadienyl cation (b) Cyclooctatetraene (c) Cycloheptatriene (d) Cycloheptatrienyl cation

Answer: (d) Cycloheptatrienyl cation Aromatic compounds are chemical compounds that consist of conjugated planar ring systems accompanied by... View Article

The lanthanide contraction is responsible for the fact that (a) Zr and Y have about the same radius (b) Zr and Nb have similar oxidation state (c) Zr and Hf have about the same radius (d) Zr and Zn have the same oxidation state

The lanthanide contraction is responsible for the fact that Zr and Hf have about the same radius. Therefore, the correct answer is option (c)... View Article

The main constituent of natural gas is: (a) Methane (b) Ethane (c) Propane (d) Butane

Natural gas is primarily composed of methane. Hence, the main constituent of natural gas is methane. So, the correct answer is option (a)... View Article

The most acidic compound among the following is: (a) phenol (b) ethanol (c) 3,5-dinitrophenol (d) 4,4-methoxyphenol

The correct answer is option (c) i.e 3, 5-dinitrophenol. Nitro is a -- R group i.e strong electron withdrawing group. Hence, more than any other... View Article

When Na₂CO₃ is heated it gives: (a) Na₂O (b) CO₂ (c) Both (a) and (b) (d) NO₂

Na2CO3 is the chemical formula of sodium bicarbonate. It undergoes a thermal decomposition reaction on heating. The reaction of decomposition is... View Article

Explain filtration with help of examples and diagram.

Filtration is technically defined as the process of separating suspended solid matter from a liquid, by causing the latter to pass through the... View Article

Draw the electron dot structure of H2.

The electron dot structure or Lewis structure of H2 (H-H) is given below:... View Article

The correct order of a dipole moment is: A. CH4 < NF3 < NH3 < H2OB. NH3 < NF3 < CH4 < H2OC. NF < CH4 < NH3 < H2OD. H2O < NH3 < NF3 < CH4

Answer: A. CH4 < NF3 < NH3 < H2O A dipole moment arises in any system in which there is a separation of charge. They can, therefore,... View Article

The chemical formula of magnesium sulphate is:

The chemical formula of magnesium sulphate is MgSO4. Also see: Magnesium Sulphate Formula... View Article

Ammonia and hydrogen chloride gases are mixed. Which type of chemical reactions it gives?

Ammonia = NH3 Hydrogen Chloride = HCl NH3 + HCl ---> NH4Cl Thus the resulting compound is Ammonium chloride... View Article

Identify conductor and insulator from following :- Sulphur , Silver , Copper , Cotton , Aluminium , Air , Nichrome , Graphite , Paper , Porcelain , Mercury, Mica , Bakelite , Polythene , Manganin.

Conductors are: Silver , Copper , Aluminium , Nichrome , Graphite , Mercury , Manganin. Insulators are: Sulphur , Cotton , Air , Paper ,... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28	29	30

Archives

From which mineral silicon is obtained?

Which one of the following is an extensive property? a. Volume b. Surface tension c. Viscosity d. Density

In ZnO + C = Zn + CO, which substance is oxidized and reduced?

Which one of the following is aromatic? (a) Cyclopentadienyl cation (b) Cyclooctatetraene (c) Cycloheptatriene (d) Cycloheptatrienyl cation

The lanthanide contraction is responsible for the fact that (a) Zr and Y have about the same radius (b) Zr and Nb have similar oxidation state (c) Zr and Hf have about the same radius (d) Zr and Zn have the same oxidation state

The main constituent of natural gas is: (a) Methane (b) Ethane (c) Propane (d) Butane

The most acidic compound among the following is: (a) phenol (b) ethanol (c) 3,5-dinitrophenol (d) 4,4-methoxyphenol

When Na₂CO₃ is heated it gives: (a) Na₂O (b) CO₂ (c) Both (a) and (b) (d) NO₂

Explain filtration with help of examples and diagram.

Draw the electron dot structure of H2.

The correct order of a dipole moment is: A. CH4 < NF3 < NH3 < H2OB. NH3 < NF3 < CH4 < H2OC. NF < CH4 < NH3 < H2OD. H2O < NH3 < NF3 < CH4

The chemical formula of magnesium sulphate is:

Ammonia and hydrogen chloride gases are mixed. Which type of chemical reactions it gives?

Identify conductor and insulator from following :- Sulphur , Silver , Copper , Cotton , Aluminium , Air , Nichrome , Graphite , Paper , Porcelain , Mercury, Mica , Bakelite , Polythene , Manganin.

The order of stability of the following carbocations:

Assign the oxidation number to MN in K2 MnO4.

Brass is a solution of molten copper in (a) solid zinc (b) molten zinc (c) gaseous zinc (d) molten tin

Why is NH4OH a weak base when it has more concentration of H ions than OH ions?

What is the number of sigma bond in P4O10?

Uses of metals and non metals in daily life

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