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The hybridisation and geometry of brf3 molecules are: A: sp3d and T shaped B: sp2d2 and tetragonal C: sp3d and bent D: None of these

Answer: A. sp3d and T shaped... View Article

Which of the following is not a mineral acid? (A) Hydrochloric acid. (B) citric acid. (C) suphuric acid. (D) Nitric acid.

Answer: (B) Citric acid Citric Acid is a weak acid with a chemical formula C6H8O7. It can occur in two forms – monohydrate or water-free... View Article

Is zinc oxide basic or acidic in nature?

Zinc oxide is an amphoteric oxide that is insoluble in water. It reacts with both acids and bases to form salts. Learn more: Zinc Oxide... View Article

How will you convert ethane to ethene organic chemistry?

Ethane when reacted with Chlorine (halogenation) in presence of sunlight gives ethyl chloride. CH3-CH3 + Cl2 ----> CH3-CH2-Cl + HCl Now,... View Article

Acidity of BF₃ can be explained on the basis of which of the following concepts? (a) Arrhenius concept (b) Bronsted Lowry concept (c) Lewis concept (d) Bronsted Lowry as well as Lewis concept

Answer: (c) Lewis concept As per Lewis's concept, a positively charged or electron-deficient species that can accept a lone pair of... View Article

Question.3: Draw a sketch of Bohr’s model of an atom with three shells.

The Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the modification of Rutherford’s model of an... View Article

Full form of GOC in organic chemistry

Full form of GOC in organic chemistry is General Organic Chemistry. Learn more: GOC... View Article

In which of the following pair, most efficient packing is present? (a) hcp and bcc (b) hcp and ccp (c) bcc and ccp (d) bcc and simple cubic cell

Answer: (b) hcp and ccp Packing efficiency of: hcp = 74% ccp = 74% bcc = 68% Simple cubic = 54% Hence, hcp and ccp have more pair of... View Article

Coal gas is mixture of: (a) CH₄+H₂+CO₂+H₂S (b) CH₄+H₂+CO+H₂S (c) CH₄+H₂+CO (d) ethane, propane, butane

Coal gas is a mixture of mainly hydrogen (H2), methane (CH4)and carbon monoxide (CO).Hence, the correct answer is option (c).... View Article

Cooking food is an example of chemical change. Explain

The raw ingredients or the vegetables cannot be regained again after cooking. Hence cooking food is an example of chemical change.... View Article

The size of colloidal particles ranges between: (a) 10^-7 – 10^-9 (b) 10^-9 – 10^-11 (c) 10^-5 – 10^-7 (d) 10^-2 – 10^-3

A colloid is primarily a heterogeneous mixture in which the minute particles of one substance are dispersed in another substance, called the... View Article

Which of the following is a thermosetting plastic? (a) PVC (b) Teflon (c) Bakelite (d) Nylon

Answer: (c) Bakelite Bakelite is a thermosetting plastic.... View Article

Which of the following is not a correct statement about the trends when going from left to right across the periods of periodic table? (A) The elements become less metallic in nature. (B) The number of valence electrons increases. (C) The atoms lose their electrons more easily. (D) The oxides become more acidic.

Answer:(C ) The atoms lost their electrons more easily... View Article

Which one of these is a monomer of bakelite? (A) Vinyl acetate (B) Tetrafluoroethylene (C) Propylene (D) Formaldehyde

Answer: (D) Formaldehyde... View Article

Many salts absorb water from the atmosphere. This property is called: (A) Hydration (B) Dehydration (C) Efflorescence (D) Deliquescence.

Answer: (D) Deliquescence... View Article

Calculate the number of moles present in 9 g of ethane.

Mass of ethane = 9 g Molar mass of ethane C2H6 = 30 g mol-1 No. of moles = Mass/ Molar mass = 9/30 = 0.3 mol... View Article

What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds (i) Are Poor conductors of electricity and (ii) Have low melting and boiling points? What happens when this compound burns in oxygen?

Methane is a colorless, odourless and highly flammable gas which is the main component of natural gas.The electron dot structure of methane is... View Article

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