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What is natural system of classification?

Answer: This is a classification method that takes into consideration comparable analysis of a number of characters in order to... View Article

Sound travels the fastest in which of the following mediums?(1) Water(2) Steel(3) Air(4) Kerosene oil

Answer: (2) The velocity of the sound varies in the different medium as given below. Sound travels in solids at... View Article

What is full form of NADP⁺?

Answer: The full name of NADP+ is Nicotinamide Adenine Dinucleotide Phosphate. However, NADP+ is a common acceptor of electrons. It... View Article

What is the atomic mass of sodium?(1) 22 g/mol (2) 23 g/mol (3) 11 g/mol (4) 20 g/mol

Answer: (2) 23 g/mol The total number of neutrons and protons of an atom is called atomic mass. The atomic mass unit... View Article

Calculate the molar mass of Nitric acid (HNO3). Atomic mass of H=1U, N=14u, O=16u

Answer: The molar mass of the chemical substance is equal to the sum of the atomic mass of the individual... View Article

(1) Why do transition elements show variable oxidation states?(2) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc(Z=21) to Zn(Z=30).(3) Name the element which shows only +3 oxidation state.

Answer: (1) Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition... View Article

Tunica corpus theory is connected with (1) root apex (2) root cap (3) shoot apex (4) secondary growth

Answer: (3) The theory of tunica corpus, given by Schmidt (1927), is connected to the apical meristem of the shoot... View Article

Which is the largest 3 digit number ?

Answer: The smallest 3-digit number is 100 and the largest 3-digit number is 999.

Find the total surface area of a solid hemisphere of radius r.

Answer: If a plane that passes through a sphere’s centre splits the sphere into two equal parts, each part is... View Article

What is meant by a positive work, negative work and zero work? Illustrate your answer with example?

Answer: Work is said to be done when a force applied to an object moves that object. Positive work When... View Article

When ethyne is passed through a red hot tube, then formation of benzene takes place:?Hof(C2H2)(g) = 230kJmol?1?Hof(C6H6)(g) = 85kJmol?1Calculate the standard heat of trimerisation of ethyne to benzene.C2H2(g) ? C6H6(g)(1) 205 kJmol?1(2) 605 kJmol?1(3) -605 kJmol?1(4) -205 kJmol?1

Answer: (3) To calculate the standard heat of trimerisation of ethyne to benzene consider a formula ΔH0trimerisation = ΔHof(C6H6) –... View Article

Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration?

Answer: The molar conductivity of a solution at infinite dilution is known as limiting molar conductivity. In other words, When... View Article

Leguminous plants are important in agriculture because(1) They are disease resistant(2) They have high amount of proteins(3) They require less amount of nitrogen for growth(4) Nitrogen-fixing bacteria are symbiotically associated in them

The correct answer is (4) Nitrogen-fixing bacteria are symbiotically associated with them Those plant that fixes atmospheric nitrogen to the... View Article

Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd?(1) pH will reduce(2) pH will increase(3) It become same as milk(4) None of the above

Answer: (1)pH will reduce Explanation The pH value of milk is 6 since it is acidic in nature. When the... View Article

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