List of top Chemistry Questions asked in Jharkhand Polytechnic

At what temperature is gypsum heated to form Plaster of Paris?
Protecting steel and iron from rusting by coating them with a thin layer of zinc is called:
What type of bond is formed by the sharing of electrons between two atoms to achieve a completely filled outermost shell?
During alloy formation if one of the metal is Hg (Mercury), then the alloy is called as:
Metal items are tarnished when kept open in air for some time. Silver utensils become blackish, copper utensils become greenish due to corrosion. The gases responsible for this corrosion respectively are:
Aqua regia is a mixture of concentrated HCl and concentrated \(HNO_3\) in the ratio of ____________ respectively.
Some metal oxides react with acid as well as base to produce salt and water, these are known as amphoteric oxides. The examples of amphoteric oxides are:
Why do ionic compounds have high melting points?
Which of the following ore is concentrated by Froth floatation process?
Four metals A, B, C and D were taken in five different solutions of silver nitrate, zinc sulphate, copper sulphate and iron sulphate and the observations have been listed below:

Reactivity order of metals A, B, C and D is:
Gold is used in making ornaments because it is :
An element X reacts with oxygen and forms oxide of X which turns red litmus to blue. The element X is a :
The chemical formula of washing soda is :
Phosphorus is stored in :
When chlorine gas is passed in lime water, it forms chemical compound 'M' (main constituent of bleaching powder) and 'N' (used for bleaching in textile industry). Identify the correct option.
How many water molecules does hydrated calcium sulphate contain?
Which one of the following does not have water of crystallization?
Which of the following is known as 'Slaked Lime'?
Match Column-I (Different substances) with Column-II (pH values) and choose the correct option from the codes given below :
Tooth-enamel is made up of :
Brine is an :
Why a mild base like magnesium hydroxide is used during indigestion?
What does calcium oxide produce when it reacts vigorously with water?
Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that:
All of the following acids dissociate completely in water, except :