301. What is an exothermic reaction?

1. Reaction in which heat is released
2. Reaction in which heat is absorbed
3. Reaction in which neither heat is released nor absorbed
4. None of these

Option “A” is correct
An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction. Expressed by chemical equation: reactants → products + energy.
302.  What are the main components of Brass Alloy?

1. Copper and Zinc
2. Copper and Strontium
3. Copper, Zinc and Nickel
4. Copper and Nickel

Option “A” is correct
Brass is a metallic alloy that is made of copper and zinc. Brass is commonly used for decorative purposes primarily because of its resemblance to gold. It is also a commonly used to make musical instruments due to its high workability and durability.
303. What is formed when Magnesium is burnt?

1. Baking Soda
2. Calcium Carbonate
3. Ash
4. Vinegar

Option “C” is correct
When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white ash of the magnesium oxide.
304. Bronze is an alloy of copper and-

1. Tin
2. Aluminum
3. Silver
4. Nickel

Option “A” is correct
Bronze is an alloy made up of Copper and another metal Tin. Compositions may very but most modern bronze is 88% Copper and 12% Tin
305. The Chemical formula of Ammonium dichromate is _____

1. (NH4)2Cr2O7
2. (NH4)CrO3
3. (NH4)Cr2O3
4. (NH4)2Cr2O3

Option “A” is correct
Ammonium dichromate is the inorganic compound with the formula (NH4)2Cr2O7.
306. The residual attractive or repulsive forces between molecules or atomic groups that do not arise from a covalent bond, or ionic bonds is called _____.

1. Neutral Bond
2. Non Polar Bond
3. Electro Valence bond
4. Van der Walls bond

Option “D” is correct
The residual attractive or repulsive forces between molecules or atomic groups that do not arise from a covalent bond, or ionic bonds is called Van der Walls bond.
307. Chromite is an ore/mineral of –

1. Zinc
2. Uranium
3. Chromium
4. Titanium

Option “C” is correct
Chromite is the only ore of chromium, a metal essential for making stainless steel, nichrome, chrome plating, pigments, refractories, chemicals and pharmaceuticals.
308. Which among the following has the maximum density?

1. Water
2. Ice
3. Ethylene
4. Acetone

Option “A” is correct
Water has maximum density.
309. What happens in an oxidation reaction?

1. Protons are lost.
2. Electrons are lost
3. Neutrons are lost
4. Electrons are gained

Option “B” is correct
Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
310. Haematite is an ore/mineral of-

1. Zinc
2. Iron
3. Lead
4. Manganese

Option “B” is correct
Haematite is an ore of Iron.
Pages: 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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

166 thoughts on “Chemistry”

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