एक तत्व X के बाह्यतम कक्षा में चार इलेक्ट्रॉन हैं। हाइड्रोजन के साथ इसके यौगिक का कौन-सा सूत्र होगा?
An element X has four electrons in its outermost shell. What will be the formula of its compound with hydrogen?
Collection of verified questions for Adhatuyen under General Science. Includes previous year exam questions with official answer keys and step-by-step solutions.
An element X has four electrons in its outermost shell. What will be the formula of its compound with hydrogen?
Water is a good solvent for ionic salts because:
Which of the following is not a crystal?
Graphene is frequently in the news. What is its importance? 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct?
Which of the following contains carbon?
Pencil lead is made of:
Which of the following materials is the strongest?
By which process does alum clean turbid/dirty water?
Heavy water is a type of:
Which of the following is responsible for the permanent hardness of water?
Which one of the following pairs is not correctly matched?
Which lubricant is used for heavy machinery?
Potable drinking water is prepared in large quantities from impure/saline water by:
In 'Heavy Water':
The process of converting saline water into pure water is called:
Which of the following elements forms the maximum number of compounds?
Which of the following catalysts is used in the hydrogenation of vegetable oils?
Consider the following statements and select the correct answer from the code given below: 1. The presence of calcium sulphate makes water hard and unfit for use. 2. Diamond is harder than copper and iron. 3. The main component of air is oxygen. 4. Nitrogen is used in the manufacture of vanaspati ghee. Code:
The unit of weight for diamond sales is carat. One carat is equal to:
Graphene is:
One mole (gram molecule) of hydrogen gas burns in excess oxygen to produce 290 kJ of heat. Under the same conditions, how much heat will be generated by burning 4 grams of hydrogen gas?
The amount of carbon is maximum in:
The chemical formula of heavy water is:
The molecular weight of heavy water is:
What is formed by burning hydrogen?