HSC Science (Electronics) ११ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

Identify primary, secondary, tertiary and quaternary carbon in the following compound. 

\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\phantom{.}\ce{CH3}\phantom{..............}
\end{array}\]

Identify primary, secondary, tertiary and quaternary carbon in the following compound.

\[\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\phantom{.}\ce{CH3}\phantom{..............}
\end{array}\]

Which of the following will exhibit geometrical isomerism? 

Define: Least count

Choose the correct option:

By decomposition of 25 g of CaCO₃, the amount of CaO produced will be ________

Choose the correct option:

The hydrocarbon contains 79.87% carbon and 20.13% of hydrogen. What is its empirical formula?

Two elements A (At. mass 75) and B (At. mass 16) combine to give a compound having 75.8 % of A. The formula of the compound is ______.

Choose the correct option:

How many grams of oxygen will be required to react completely with 27 g of Al? (Atomic mass: Al = 27, O = 16)

Choose the correct option:

In CuSO₄.5H₂O the percentage of water is ______
(Cu = 63.5, S = 32, O = 16, H = 1)

Explain the term percentage composition.

Explain the term empirical formula.

Explain the term molecular formula.

Solve the following problem:

Work out the percentage composition of constituent elements in the following compound:

Lead phosphate [Pb₃(PO₄)₂]

(At. mass: Pb = 207; P = 31; O = 16; K = 39; Cr = 52; Na = 23; N = 14)

Solve the following problem:

Work out the percentage composition of constituent elements in the following compound:

Potassium dichromate (K₂Cr₂O₇)

(At. mass: Pb = 207; P = 31; O = 16; K = 39; Cr = 52; Na = 23; N = 14)

Solve the following problem:

Work out the percentage composition of constituent elements in the following compound:

Macrocosmic salt - Sodium ammonium hydrogen phosphate, tetrahydrate (NaNH₄HPO₄.4H₂O)

(At. mass: Pb = 207; P = 31; O = 16; K = 39; Cr = 52; Na = 23; N = 14)

Solve the following problem:

Find the percentage composition of constituent green vitriol crystals (FeSO₄.7H₂O). Also, find out the mass of iron and the water of crystallisation in 4.54 kg of the crystals. (At. mass : Fe = 56; S = 32; O = 16)

Solve the following problem:

The red colour of blood is due to a compound called “haemoglobin”. It contains 0.335% of iron. Four atoms of iron are present in one molecule of haemoglobin. What is its molecular weight? (At. mass: Fe = 55.84)

A substance, on analysis, gave the following percent composition: Na = 43.4%, C = 11.3% and O = 45.3%. Calculate the empirical formula. (At. mass Na = 23 u, C = 12 u, O = 16 u).

Solve the following problem:

Assuming the atomic weight of a metal M to be 56, find the empirical formula of its oxide containing 70.0% of M.

1.00 g of a hydrated salt contains 0.2014 g of iron, 0.1153 g of sulfur, 0.2301 g of oxygen, and 0.4532 g of water of crystallisation. Find the empirical formula. (At. wt.: Fe = 56; S = 32; O = 16)