Write down the relationship between the SI and CGS unit of area.
The S.I. unit of work is Joule (J) or Nm. C.G.S unit of work is erg or dyne cm. where... View Article
Latest Posts
What is marble cancer?
The acids in the acid rain react with calcium carbonate of marble and degrade it. The phenomenon is called Marble... View Article
Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.
Answer: A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or... View Article
The compound whose 0.1 M solution is basic:- (1) NH4Cl (2) CH3COONa (3) Na2SO4 (4) CH3COONH4
CH3COONa is the compound whose 0.1M solution is basic. A reaction between a strong base and a weak acid leaves... View Article
Which of the following is not an insulator i) Bricks ii) Brass iii) Bamboo iv) Plastic
Plastic and wood are poor conductors of heat. Brass is a type of metal which is alloy of zinc and... View Article
What chemical is present in a fire extinguisher?
Fire Extinguishers contain H2SO4 and NaHCO3. Fire extinguishers contain different chemicals, depending on the application. When the fire extinguisher is... View Article
What is group reagent?
The reagent which is employed in idntifying a gourp of radicals is known as group reagent . Ammonium sulphide is... View Article
One gas bleaches the colour of flowers by reduction and another gas by oxidation. The gases are?
The bleaching action of SO2 is due to reduction while the bleaching action of Cl2 is due to oxidation. Thus,... View Article
What is the valency of acetic acid?
The chemical formula of Acetic Acid is CH3COOH and acetate is CH3COO- Carbon has a valency of 4, hydrogen 1... View Article
The density of water varies with temperature. What are its consequences?
The density of water is approximately one gram per cubic centimetre. It is dependent on its temperature, but the relation... View Article
What does the Rainbow look like?
Rainbow is seen in sky as a semi circle. It is made up of seven colors – red, orange, yellow,... View Article
Write the balanced equation for the following chemical reactions. (a) Hydrogen + Chlorine → Hydrogen chloride (b) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (c) Sodium + Water → Sodium hydroxide + Hydrogen
Answer: The representation of a chemical reaction in the form of substances is known as a chemical equation. The equation... View Article
Which pair will show common ion effect? a) BaCl2 + Ba(NO3)2 b) NaCl + HCl c) NH4OH + NH4Cl d) AgCN + KCN
Common ion effect is shown when weak electrolyte and strong electrolyte is mixed. NaCl and HCl dissociate completely as one... View Article
Account for the following: (i) State the relation between hydrogen ion concentration of an aqueous solution and its pH. (ii) An aqueous solution has a pH value of 7.0. Is this solution acidic, basic or neutral? (iii) Which has a higher pH value, 1 M HCI or 1 M NaOH solution? (iv) Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it? (v) How do [H + ] ions exist in water?
If H+ ion concentration is more, pH will be less and vice-versa or pH of a solution is inversely proportional... View Article
Ce-58 is a member of A) s-block elements B) p-block elements C) d-block elements D) f-block
The electronic configuration of Ce is [Xe]4f15d16s2. From the configuration it is clear that the electron has entered the f... View Article
Which of the following is not an emulsion? A. Milk B. Cold cream C. Butter D. Shaving cream
The colloidal solution contains two components called dispersing phase and dispersing medium. An emulsion is mixture of two liquids that... View Article
What is present in a sample of pure water irrespective of the source?
When a sample of water is taken from any of the source it contains 88.8% by mass of oxygen and... View Article
What is the original colour of phenolphthalein?
Phenolphthalein is naturally colourless but turns pink in alkaline solutions. In acidic pH levels the indicator remains colourless throughout and... View Article
What is sieving?
Sieving allows the fine flour particles to pass through the holes of the sieve while the bigger impurities remain on... View Article
What is the process of converting propanol to propanoic acid?
Propanol is converted into propanoic acid by the oxidation reaction. Propanoic acid is formed by oxidation of propanol in the... View Article
