The functional group which is recognised as alcohol is
A) —CHO
B) —OH
C) —CO
D) —COOH
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In \( III ^{ rd } \) group of salt analysis for cations \( NH _{4} Cl \) and \( NH _{4} OH \) are added as group reagents. Which of the following can be used instead of \( NH _{4} Cl \) ? (a) \( NaCl \) (b) \( \left( NH _{4}\right)_{2} SO _{4} \) (c) \( \left( NH _{4}\right)_{2} C _{2} O _{4} \) (d) \( NH _{4} NO _{3} \)
d) NH4NO3 As it provides NH+4 ions which suppresses the ionisation of NH4OH so that only the group 3rd cations are precipitated as hydroxides because of their low solubility products and NO−3 ions...
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Mahatma Gandhi is recognised as the prominent person of 20th century, because
D) he organized the world famous Free-dom movement on the principles of Non – violence and Satyagraha
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Nitrogen is the element of group-VA of the periodic table. Which of the following is the atomic number of the next element in the group?
Correct option is C) 15
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Group — Valency I group — i) +2 ,II group — ii) -1
B) a → iii, b → i, c → iv, d → ii
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Carbon (Z=6) is the element of group-IVA of periodic table. Which of the following is the atomic number of next number in the group
Correct option is B) 14
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The functional group present in methanol is ………
Correct option is A) Alcohol
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A reaction in which an atom or a group of atoms in a compound is replaced by other atom or group of atoms is called ……………… reaction.
Correct option is C) substitution
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Match the following. Group – A 1) ‘O’ group 2) AB’ group
Group – A Group – B 1) ‘O’ group D) Universal donors 2) AB’ group A) Universal recipients 3) Myeline sheath B) Axon 4) Land Steiner E) Blood groups 5) Granulocytes C) Eosinophils
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State the trends in the following properties of group 1 and group 2 elements down a group.
Sr. no. Property Down a group i Atomic radii Increases ii Ionic radii Increases iii Ionization enthalpy Decreases iv Electronegativity Decreases v Standard reduction potential Decreases
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How many recognised honey bee species are there in India?
Answer is (C) 5
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