441. Which among the following will be a negative ion?

1. If it has more electrons than protons
2. If it has more electrons than neutrons
3. If it has more protons than electrons
4. If it has more protons than neutrons

Option “1” is correct.
Negative ion which is created by an electron gain and it has more electrons than protons.
442. Why metals conduct electricity?

1. Because of low melting point
2. Because of high tensile strength
3. Because of free electrons
4. Because of high atomic density

Option “3” is correct.
Metals conduct electricity because of free electrons.
443. The poisonous gas accidentally released in Bhopal Gas Tragedy is –

1. Methane
2. Nitrous Oxide
3. Methyl Isocyanate
4. Cyanogen

Option “3” is correct.
Bhopal gas tragedy occured on the night of 2–3 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh. Over 500,000 people were exposed to methyl isocyanate (MIC) gas and other chemicals leaked from UCIL.
444. Release of which among the following is the primary reason for depletion of the ozone layer?

1. Nitrous oxide
2. Hydrogen dioxide
3. Chlorofluro carbon
4. Carbon monoxide

Option “3” is correct.
The Chlorofluro carbon formed by chlorine, fluorine and carbon. They are often used as refrigerants, solvents, and for the manufacture of spongy plastics. It is the primary reason for depletion of the ozone layer.
445. Which amongst the following is not a Cation?

1. Aluminium ion
2. Copper ion
3. Sulphate ion
4. Zinc ion

Option “3” is correct.
A cation is a positively-charged ion, while an anion is negatively charged. Sulphate is an anion.
446. Which of the following elements has the lowest melting point?

1. Iodine
2. Lead
3. Tin
4. Mercury

Option “4” is correct.
Mercury has the lowest melting point. Mercury has a melting point of -37.89F.
447. The common name of sodium bicarbonate is _____.

1. Baking soda
2. Borax
3. Bleach
4. Epsom salt

Option “1” is correct.
Sodium bicarbonate is commonly known as baking soda. It is a chemical compound with the formula NaHCO3.
448. Metals react with sodium hydroxide to produce ___________.

1. Oxygen gas
2. Sodium
3. Water
4. Hydrogen gas

Option “4” is correct.
Sodium hydroxide reacts with metal to release hydrogen gas. The metal takes the oxygen atom from sodium hydroxide, which in turn takes the oxygen atom from the water, and releases the two hydrogen atoms. The reaction thus produces hydrogen gas.
449. Which base is present in lime water?

1. Sodium hydroxide
2. Magnesium hydroxide
3. Calcium hydroxide
4. Ammonium hydroxide

Option “3” is correct.
Calcium hydroxide base is present in lime water.
450. Rusting is _____.

1. Electrolysis
2. Oxidation
3. Redox
4. Reduction

Option “3” is correct.
Redox reaction is the reaction in which oxidation and reduction occurs simultaneously. Rust of iron is nothing but hydrate of iron oxide and iron (III) oxide -hydroxide.
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9 thoughts on “Chemistry”

  6. Dolly

    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

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